| Dec 31, 2011 | Dec 31, 2012 | Dec 31, 2013 | Dec 31, 2014 | Dec 31, 2015 | Dec 31, 2016 | Dec 31, 2017 | Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Net income | 5 | 7 | 7 | 8 | 8 | 9 | 8 | 7 | 11 | 13 | 13 | 13 | 11 | 9 |
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| Depreciation | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 |
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| Credit loss expense (benefit) | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 |
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| Deferred Income Tax Expense (Benefit) | 1 | -1 | 1 | -0 | 0 | 1 | 1 | -1 | 0 | -1 | 0 | -0 | 0 | -2 |
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| Net amortization of premiums on investment securities | -0 | -0 | -0 | -0 | -0 | -0 | -0 | -0 | -0 | -1 | -1 | -1 | -1 | -1 |
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| Equity in losses of limited partnerships | - | - | - | - | - | - | - | 1 | 1 | 1 | 1 | 1 | 1 | 2 |
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| Stock based compensation expense | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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| Net increase in unamortized loan costs | - | - | - | - | - | - | - | - | - | -1 | 1 | 1 | 0 | 0 |
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| Proceeds from Sale, Loan, Held-for-Sale | 82 | 130 | 125 | 97 | 135 | 138 | 125 | 119 | 161 | 271 | 222 | 79 | 77 | 115 |
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| Origination of loans held for sale | 80 | 132 | 116 | 102 | 127 | 138 | 122 | 112 | 163 | 288 | 198 | 65 | 77 | 116 |
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| Net gains on sales of loans held for sale | 2 | 4 | 2 | 2 | 3 | 3 | 2 | 2 | 3 | 8 | 5 | 1 | 1 | 2 |
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| Net gains on disposals of premises and equipment | -0 | 0 | - | -0 | -0 | -0 | -0 | 0 | - | - | -0 | - | 0 | 0 |
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| Net losses on sales of investment securities available-for-sale | - | - | - | - | - | - | - | - | - | 0 | - | 0 | - | -1 |
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| Net gains on other investments | - | - | - | - | - | - | - | - | - | 0 | -0 | -0 | 0 | 0 |
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| Increase in accrued interest receivable | 0 | -0 | 0 | 0 | -0 | 0 | 0 | 0 | 0 | 1 | -1 | 1 | 1 | 1 |
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| Amortization of debt issuance costs | - | - | - | - | - | - | - | - | - | - | 0 | 0 | 0 | 0 |
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| Increase in other assets | 0 | 0 | 2 | -2 | 1 | 1 | 1 | 1 | 0 | 1 | 6 | 0 | 3 | 0 |
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| Increase in other liabilities | 1 | 2 | 2 | -2 | -1 | 1 | 0 | -0 | 2 | 1 | -1 | 2 | 1 | 3 |
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| Net cash provided by operating activities | 7 | 3 | 18 | 2 | 13 | 8 | 10 | 17 | 12 | -7 | 29 | 29 | 9 | 12 |
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| Proceeds from maturities and redemptions | 8 | 11 | 10 | 10 | 4 | 4 | 5 | 4 | 3 | 4 | 7 | 8 | 8 | 9 |
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| Purchases | 18 | 9 | 5 | 5 | 4 | 1 | 5 | 4 | 0 | 10 | 7 | 11 | 6 | 4 |
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| Proceeds from sales | - | - | - | - | - | - | - | - | - | 3 | 9 | 7 | - | 37 |
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| Proceeds from maturities, calls and paydowns | 11 | 17 | 5 | 4 | 7 | 10 | 7 | 6 | 11 | 22 | 28 | 24 | 17 | 19 |
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| Purchases | - | - | - | - | - | - | - | - | - | 42 | 205 | 59 | 25 | 47 |
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| Net purchases of other investments | - | - | - | - | - | - | - | - | - | - | - | 0 | 0 | 0 |
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| Net increase in nonmarketable stock | - | - | - | - | - | - | - | 0 | 0 | -1 | 0 | 2 | 0 | 8 |
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| Net increase in loans | - | - | - | - | - | - | - | - | - | 101 | 16 | 171 | 70 | 127 |
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| Recoveries of loans charged off | - | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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| Net purchases of premises and equipment | 1 | 2 | 1 | 2 | 2 | 2 | 2 | 3 | 6 | 1 | 4 | 1 | 2 | 1 |
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| Investments in limited partnerships | 2 | 1 | - | 0 | 0 | 1 | 0 | 1 | 2 | 2 | 2 | 2 | 3 | 3 |
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| Proceeds from Life Insurance Policy | - | - | - | - | - | 1 | - | 0 | - | - | - | - | - | 0 |
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| Proceeds from sales of premises and equipment | - | 0 | - | - | - | 0 | - | 0 | - | - | - | - | 0 | 0 |
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| Net cash used in investing activities | -23 | -0 | -35 | -22 | -35 | -41 | -55 | -68 | -49 | -126 | -190 | -208 | -82 | -125 |
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| Advances on long-term borrowings | - | 2 | 2 | - | - | 25 | 10 | 7 | - | - | - | - | 91 | 285 |
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| Repayment of long-term borrowings | 5 | 13 | 2 | 4 | 0 | 3 | 10 | 20 | 20 | - | 7 | - | 35 | 110 |
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| Proceeds from (Repayments of) Short-Term Debt | 1 | -3 | -3 | 5 | -5 | -1 | 0 | 9 | 40 | -40 | - | 50 | -40 | 19 |
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| Net Change Noninterest-bearing Deposits | 9 | 7 | 4 | 3 | 9 | 13 | 15 | 5 | 3 | 79 | 50 | 21 | -35 | -25 |
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| Net Change Interest-bearing Non-time Deposits | 25 | 34 | -4 | 33 | 7 | 72 | 37 | 26 | 14 | 178 | 86 | 39 | 3 | -51 |
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| Increase (Decrease) in Time Deposits | -1 | -5 | 9 | -3 | -9 | -47 | -2 | 28 | 20 | -7 | -35 | 46 | 136 | -61 |
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| Purchase of treasury stock | - | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | - | 0 | 0 | 0 | - |
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| Dividends paid | - | - | - | - | - | - | - | - | - | - | 6 | 6 | 6 | 6 |
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| Net cash provided by financing activities | 25 | 19 | 1 | 31 | -2 | 54 | 45 | 50 | 51 | 205 | 104 | 151 | 113 | 51 |
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| Net (decrease) increase in cash and cash equivalents | - | - | - | - | - | - | - | - | - | 72 | -57 | -28 | 40 | -62 |
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| Interest paid | - | - | - | - | - | - | - | - | 5 | 6 | 3 | 4 | 18 | 28 |
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| Income taxes paid | 1 | 2 | 1 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 2 | 1 | 1 | - |
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| Investment in limited partnerships acquired by capital contributions payable | 1 | - | - | 0 | - | 0 | 1 | 1 | 0 | 3 | 1 | 3 | 2 | 2 |
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| Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | - | - | - | - | - | - | - | - | 2 | - | - | 1 | 0 | - |
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| Dividends declared | 4 | 4 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 7 |
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| Dividends reinvested | - | - | - | - | - | - | - | - | - | - | 0 | 0 | 0 | 0 |
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| Dividends paid | - | - | - | - | - | - | - | - | - | - | 6 | 6 | 6 | 6 |
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