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Guarantees, Commitments and Contingencies (Narrative) (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) Apartment | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) Apartment | Dec. 31, 2018 USD ($)
Commitments, Contingencies and Guarantees [Line Items] |  |  |  |
Number of apartments under the project | Apartment | 37 |  | 37 |
Limited partner capital contribution commitment | $ 7,579,000 |  | $ 7,579,000 |
Project investment amortization period | 10 years |  | 10 years |
Annual LIHTCs mount awarded for the project | $ 861,000 |  | $ 861,000 |
Total anticipated LIHTCs amount under the housing project | $ 8,613,000 |  | $ 8,613,000 |
Total investment in limited partnership |  | $ 211,000 |  | $ 233,000
Minimum net assets qualified for small banks assessment credits |  | 10,000,000,000 |  |
Total assessment credit |  | $ 492,000 |  |
Minimum [Member] |  |  |  |
Commitments, Contingencies and Guarantees [Line Items] |  |  |  |
Small bank growth reserve ratio |  | 1.15% |  |
Reserve ratio for assessment credits to be contingent |  | 1.38% |  |
Maximum [Member] |  |  |  |
Commitments, Contingencies and Guarantees [Line Items] |  |  |  |
Small bank growth reserve ratio |  | 1.35% |  |
Other Assets [Member] |  |  |  |
Commitments, Contingencies and Guarantees [Line Items] |  |  |  |
Total investment in limited partnership |  | $ 4,356,000 |  | 1,710,000
Financial Standby Letters of Credit [Member] |  |  |  |
Commitments, Contingencies and Guarantees [Line Items] |  |  |  |
Commitments to extend credit |  | $ 29,797,000 |  | $ 20,839,000

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