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Loans - Summary of Average of Impaired Loans and Related Interest Income by Loan Portfolio Class (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Financing Receivable, Impaired [Line Items]
Impaired Loans with Allowance: Average Recorded Investment	$ 1,949	$ 186	$ 1,739	$ 124
Impaired Loans with Allowance: Interest Income	0	0	0	0
Impaired Loans with No Allowance: Average Recorded Investment	9,480	10,671	9,844	10,611
Impaired Loans with No Allowance: Interest Income	124	109	253	232
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Impaired Loans with Allowance: Average Recorded Investment	1,156	0	1,085	0
Impaired Loans with Allowance: Interest Income	0	0	0	0
Impaired Loans with No Allowance: Average Recorded Investment	1,101	1,440	1,115	1,451
Impaired Loans with No Allowance: Interest Income	0	0	0	0
Commercial real estate
Financing Receivable, Impaired [Line Items]
Impaired Loans with Allowance: Average Recorded Investment	416	0	0	0
Impaired Loans with Allowance: Interest Income	0	0	0	0
Impaired Loans with No Allowance: Average Recorded Investment	8,144	8,446	8,346	8,359
Impaired Loans with No Allowance: Interest Income	123	105	213	223
Commercial real estate construction
Financing Receivable, Impaired [Line Items]
Impaired Loans with Allowance: Average Recorded Investment	0	0	277	0
Impaired Loans with Allowance: Interest Income	0	0	0	0
Impaired Loans with No Allowance: Average Recorded Investment	0	337	100	349
Impaired Loans with No Allowance: Interest Income	0	0	25	0
Residential mortgage
Financing Receivable, Impaired [Line Items]
Impaired Loans with Allowance: Average Recorded Investment	377	186	377	124
Impaired Loans with Allowance: Interest Income	0	0	0	0
Impaired Loans with No Allowance: Average Recorded Investment	235	448	283	452
Impaired Loans with No Allowance: Interest Income	$ 1	$ 4	$ 15	$ 9

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Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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Amount of interest income, recognized on cash basis, on financing receivables, for which there is no related allowance for credit losses and are recognized as impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

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Amount of interest income on financing receivables, for which there is a related allowance for credit losses, recognized on a cash-basis method of accounting that the financing receivables were impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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