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Guarantees and Commitments (Narrative) (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) Apartment | Sep. 30, 2019 USD ($) 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 |  | 201,000 | $ 233,000
Other Assets [Member] |  |  |
Commitments, Contingencies and Guarantees [Line Items] |  |  |
Total investment in limited partnership |  | 5,810,000 | 1,710,000
Financial Standby Letters of Credit [Member] |  |  |
Commitments, Contingencies and Guarantees [Line Items] |  |  |
Commitments to extend credit |  | $ 27,757,000 | $ 20,839,000

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