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Summary of Significant Accounting Policies - Other (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Summary Of Significant Accounting Policies |  |  |
Mortgage loans held for sale | $ 583,000 | $ 383,000 |
Depreciation methods | straight-line and accelerated methods |  |
Sustained period of repayment performance for non-accrual TDRs | 6 months |  |
Period of employees highest compensation before retirement | 10 years |  |
Certificates of deposit in other banks | $ 12,247,000 | $ 3,460,000 |
Federal corporate income tax rate | 21.00% | 34.00% | 34.00%
Amounts reclassified from accumulated other comprehensive loss per ASU 2018-02 | $ 0 | $ 0 |
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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- Definition Represents the percentage of advances from the FHLB to the Bank in which that amount is required to be maintained as an investment in the capital stock of the FHLB. + References No definition available. + Details
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- Definition A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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