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Loan Servicing - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Loan Sales And Mortgage Servicing Rights [Line Items]
Servicing assets	$ 5,370,000		$ 5,370,000		$ 3,704,000
Loan servicing fees, net of amortization	314,000	$ 95,000	571,000	$ 384,000
Mortgage Loans
Loan Sales And Mortgage Servicing Rights [Line Items]
Servicing assets	1,804,000		1,804,000		1,184,000
SBA Loans
Loan Sales And Mortgage Servicing Rights [Line Items]
Servicing assets	$ 4,982,000		$ 4,982,000		$ 3,142,000

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- Definition

Loan sales and mortgage servicing rights.

+ References

No definition available.

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- Definition

Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

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- Definition

Amount of revenue from servicing real estate mortgages, credit cards, and other financial assets held by others. Includes premiums received in lieu of regular servicing fees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13 (d))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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