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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 01, 2023 | Dec. 31, 2023 | Jan. 01, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Summary Of Significant Accounting Policies |  |  |  |  |
Loans held for sale, at lower of cost or fair value |  | $ 3,884,000 |  | $ 591,000 |
Period of employees highest compensation before retirement |  | 10 years |  |  |
Tax liabilities related to uncertain tax positions |  | $ 0 |  | 0 | $ 0
Special stock dividend, rate percent (in percent) | 4.00% |  |  |  |
Decrease to retained earnings |  | $ (76,464,000) |  | $ (91,789,000) |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |
Decrease to retained earnings |  |  | $ 5,581,000 |  |
Buildings and improvements | Minimum |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |
Estimated useful lives |  | 5 years |  |  |
Buildings and improvements | Maximum |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |
Estimated useful lives |  | 40 years |  |  |
Furniture and Fixtures | Minimum |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |
Estimated useful lives |  | 3 years |  |  |
Furniture and Fixtures | Maximum |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |
Estimated useful lives |  | 15 years |  |  |
Federal Home Loan Bank of Des Moines |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |
Investment in capital stock of Federal Home Loan Bank required percentage of advances (in percent) |  | 4.50% |  |  |

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