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Guarantees and Commitments (Narrative) (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) Apartment | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Commitments, Contingencies and Guarantees [Line Items] |  |  |
Number of apartments under the project | Apartment | 37 |  |
Limited partner capital contribution commitment | $ 7,579,000 |  |
Project investment amortization period | 10 years |  |
Annual LIHTCs mount awarded for the project | $ 861,000 |  |
Total anticipated LIHTCs amount under the housing project | $ 8,613,000 |  |
Other Assets [Member] |  |  |
Commitments, Contingencies and Guarantees [Line Items] |  |  |
Total investment in limited partnership |  | $ 1,472,000 |
Financial Standby Letters of Credit [Member] |  |  |
Commitments, Contingencies and Guarantees [Line Items] |  |  |
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure |  | $ 22,479,000 | $ 20,496,000

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