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Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 USD ($) store | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) store | Dec. 31, 2019 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |
Number of full-service banking offices | store | 6 |  | 6 |
Cash exceeded federally insured limits | $ 215,700 |  | $ 215,700 |
Cash held, not federally insured | 203,000 |  | 203,000 |
Interest-bearing deposits in other financial institutions | 100 | $ 100 | 100 | $ 100
Balance outstanding in joint ventures | 1,406 | 1,000 | 1,406 | 1,000
Income recognized on joint ventures |  |  | $ 173 | 57
Tax benefit greater than being realized on examination |  |  | 50.00% |
FRB regulatory reserve requirement | 0 | 5,164 | $ 0 | 5,164
Collateral pledged for advances | 110,951 | 118,443 | 110,951 | 118,443
Investment | 0 | 894 |  |
Maximum exposure to loss related to investments | 0 |  |  |
Cash [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Collateral pledged for advances | $ 3,300 | 3,300 | $ 3,300 | 3,300
Minimum [Member] | Buildings And Related Components [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life |  |  | 3 years |
Minimum [Member] | Furniture, fixtures and equipment [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life |  |  | 2 years |
Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Home equity lines of credit combined with the balance of the prior mortgage liens | 89.90% |  | 89.90% |
Maturity of cash, deposits with other financial institutions |  |  | 90 days |
Maximum [Member] | Buildings And Related Components [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life |  |  | 40 years |
Maximum [Member] | Furniture, fixtures and equipment [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful life |  |  | 25 years |
Single-Family Residential [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Collateral pledged for advances | $ 87,076 | 79,144 | $ 87,076 | 79,144
Single-Family Residential [Member] | Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Lending amount up to the percentage of collateral | 80.00% |  | 80.00% |
Multi-Family Residential [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Collateral pledged for advances | $ 10,970 | 21,258 | $ 10,970 | 21,258
Multi-Family Residential [Member] | Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Fixed rates loans limit, period |  |  | 3 years |
Multi-Family Residential [Member] | Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Lending amount up to the percentage of collateral | 85.00% |  | 85.00% |
Fixed rates loans limit, period |  |  | 5 years |
Real Estate Commercial [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Collateral pledged for advances | $ 5,750 | $ 6,639 | $ 5,750 | $ 6,639
Real Estate Commercial [Member] | Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Fixed rates loans limit, period |  |  | 3 years |
Real Estate Commercial [Member] | Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Lending amount up to the percentage of collateral | 85.00% |  | 85.00% |
Fixed rates loans limit, period |  |  | 5 years |
Construction [Member] | Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Lending amount up to the percentage of collateral | 80.00% |  | 80.00% |
Maturity of construction loans convert to permanent loans |  |  | 30 years |

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