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Guarantees and Commitments (Narrative) (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) Apartment | Dec. 31, 2017 USD ($)
Commitments, Contingencies and Guarantees [Line Items] |  |
Number of apartments under the project | Apartment | 37 |
Limited partner capital contribution commitment | $ 7,593,000 |
Project investment amortization period | 10 years |
Annual LIHTCs mount awarded for the project | $ 863,000 |
Total anticipated LIHTCs amount under the housing project | 8,629,000 |
Financial Standby Letters of Credit [Member] |  |
Commitments, Contingencies and Guarantees [Line Items] |  |
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure | $ 20,647,000 | $ 20,496,000

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