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Summary of Significant Accounting Policies - Other (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jul. 01, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Summary Of Significant Accounting Policies |  |  |  |
Mortgage loans held for sale |  | $ 428,000 | $ 583,000 |
Sustained period of repayment performance for non-accrual TDRs |  | 6 months |  |
Depreciation methods |  | straight-line and accelerated methods |  |
Period of employees highest compensation before retirement |  | 10 years |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% | 21.00% | 34.00%
Tax liabilities related to uncertain tax positions |  | $ 0 | $ 0 | $ 0
Interest or penalties recognized related to uncertain tax positions |  | 0 | $ 0 | 0
Amounts reclassified from accumulated other comprehensive loss per ASU 2018-02 |  | $ 0 |  | 0
Special stock dividend, rate percent | 4.00% |  |  |
Retained Earnings |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |
Amounts reclassified from accumulated other comprehensive loss per ASU 2018-02 |  |  |  | 1,218,000
Accumulated Other Comprehensive Loss |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |
Amounts reclassified from accumulated other comprehensive loss per ASU 2018-02 |  |  |  | $ (1,218,000)
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 the Federal Home Loan Bank of total assets |  | 0.12% |  |
Investment in capital stock of Federal Home Loan Bank required percentage of advances |  | 4.00% |  |

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