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Qualified Affordable Housing Project Investments - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Schedule Of Equity Method Investments [Line Items]
Investment for qualified affordable housing projects	$ 5,768,000		$ 986,000
Unfunded commitments related to the investments in qualified housing projects	4,572,000		$ 840,000
Amortization expense	$ 218,000	$ 10,000
Maximum
Schedule Of Equity Method Investments [Line Items]
Expected year in which commitments are fulfilled	2027
Minimum
Schedule Of Equity Method Investments [Line Items]
Expected year in which commitments are fulfilled	2028

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- Definition

Year in which contingent commitments to qualified affordable housing project investments are expected to be paid, in CCYY format.

+ References

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X

- Definition

Amount of investment in qualified affordable housing projects.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 740
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64813897&loc=SL49122993-202985

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- Definition

Amount of amortization expense of investment in qualified affordable housing projects.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 740
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=64813897&loc=SL49122993-202985

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 740
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=64813897&loc=SL49122993-202985

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