Loans and Allowance for Credit Losses - Allowance for Credit Losses (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2016 USD ($) quarter	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) quarter	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Lookback period used in reserve analysis \| quarter	20		20
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	$ 9,872	$ 8,714	$ 9,610	$ 8,308
Provision charged to operations	(1,000)	100	(5,850)	600
Losses charged to allowance	(530)	(33)	(647)	(803)
Recoveries	957	312	6,186	988
Allowance for credit losses, ending balance	9,299	9,093	9,299	9,093
Ending balance: individually evaluated for impairment	192		192		$ 164
Ending balance: collectively evaluated for impairment	9,107		9,107		9,446
Commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	2,972	3,553	3,562	3,130
Provision charged to operations	(963)	(186)	(5,787)	731
Losses charged to allowance	(494)	(11)	(499)	(708)
Recoveries	803	267	5,042	470
Allowance for credit losses, ending balance	2,318	3,623	2,318	3,623
Ending balance: individually evaluated for impairment	13		13		1
Ending balance: collectively evaluated for impairment	2,305		2,305		3,561
Real Estate Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	5,660	4,429	5,204	4,058
Provision charged to operations	259	154	(136)	509
Losses charged to allowance	0	0	0	0
Recoveries	131	8	982	24
Allowance for credit losses, ending balance	6,050	4,591	6,050	4,591
Ending balance: individually evaluated for impairment	96		96		128
Ending balance: collectively evaluated for impairment	5,954		5,954		5,076
Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	948	732	734	1,078
Provision charged to operations	(23)	27	164	(703)
Losses charged to allowance	(36)	(22)	(148)	(95)
Recoveries	23	37	162	494
Allowance for credit losses, ending balance	912	774	912	774
Ending balance: individually evaluated for impairment	83		83		35
Ending balance: collectively evaluated for impairment	829		829		699
Unallocated
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	292	0	110	42
Provision charged to operations	(273)	105	(91)	63
Losses charged to allowance	0	0	0	0
Recoveries	0	0	0	0
Allowance for credit losses, ending balance	19	$ 105	19	$ 105
Ending balance: individually evaluated for impairment	0		0		0
Ending balance: collectively evaluated for impairment	$ 19		$ 19		$ 110

Financing Receivable, Allowance for Credit Losses, Methodology Change, Number of Rolling Quarters Used in Analysis

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- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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Amount of direct write-downs of financing receivables charged against the allowance.

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- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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