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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		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Impaired [Line Items]
Impaired Loans with Allowance: Average Recorded Investment	$ 2,570	$ 374	$ 1,945	$ 187
Impaired Loans with Allowance: Interest Income	0	0	0	0
Impaired Loans with No Allowance: Average Recorded Investment	8,461	10,231	9,402	10,452
Impaired Loans with No Allowance: Interest Income	80	111	333	343
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Impaired Loans with Allowance: Average Recorded Investment	1,360	0	1,152	0
Impaired Loans with Allowance: Interest Income	0	0	0	0
Impaired Loans with No Allowance: Average Recorded Investment	734	1,361	934	1,400
Impaired Loans with No Allowance: Interest Income	0	3	0	3
Commercial real estate
Financing Receivable, Impaired [Line Items]
Impaired Loans with Allowance: Average Recorded Investment	832	0	416	0
Impaired Loans with Allowance: Interest Income	0	0	0	0
Impaired Loans with No Allowance: Average Recorded Investment	7,626	8,156	8,155	8,280
Impaired Loans with No Allowance: Interest Income	80	104	293	327
Commercial real estate construction
Financing Receivable, Impaired [Line Items]
Impaired Loans with Allowance: Average Recorded Investment	0	0	0	0
Impaired Loans with Allowance: Interest Income	0	0	0	0
Impaired Loans with No Allowance: Average Recorded Investment	0	300	75	337
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	378	374	377	187
Impaired Loans with Allowance: Interest Income	0	0	0	0
Impaired Loans with No Allowance: Average Recorded Investment	101	414	238	435
Impaired Loans with No Allowance: Interest Income	$ 0	$ 4	$ 15	$ 13

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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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