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Summary of Significant Accounting Policies (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 01, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Summary Of Significant Accounting Policies |  |  |  |
Mortgage loans held for sale |  | $ 5,100,000 | $ 428,000 |
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 |  |
Tax liabilities related to uncertain tax positions |  | $ 0 | 0 | $ 0
Interest or penalties recognized related to uncertain tax positions |  | $ 0 | $ 0 | $ 0
Dividends Payable, Date to be Paid | Jul. 01, 2020 |  |  |
Special stock dividend, rate percent | 4.00% |  |  |
Special stock dividend, record date | Jun. 15, 2020 |  |  |
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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