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Guarantees and Commitments (Narrative) (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Financial Standby Letters of Credit [Member]
Commitments, Contingencies and Guarantees [Line Items]
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure	$ 20,904,000	$ 14,000,000

X

- Definition

Commitments, contingencies and guarantees.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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