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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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Affordable housing tax credits and other tax benefits anticipated amount.

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Commitments, contingencies and guarantees.

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Qualified affordable housing project investments amortization period.

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Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

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Amount of commitment or contingent commitments to qualified affordable housing project investments.

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