Loans and Allowance for Credit Losses - Allowance for Credit Losses (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016 USD ($) quarter	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) quarter	Jun. 30, 2015 USD ($)	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	$ 10,136	$ 8,399	$ 9,610	$ 8,308
Provision charged to operations	(4,600)	500	(4,850)	500
Losses charged to allowance	(105)	(329)	(118)	(770)
Recoveries	4,441	144	5,230	676
Allowance for credit losses, ending balance	9,872	8,714	9,872	8,714
Ending balance: individually evaluated for impairment	394		394		$ 164
Ending balance: collectively evaluated for impairment	9,478		9,478		9,446
Commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	3,743	3,129	3,562	3,130
Provision charged to operations	(4,673)	610	(4,825)	917
Losses charged to allowance	0	(287)	(4)	(697)
Recoveries	3,902	101	4,239	203
Allowance for credit losses, ending balance	2,972	3,553	2,972	3,553
Ending balance: individually evaluated for impairment	230		230		1
Ending balance: collectively evaluated for impairment	2,742		2,742		3,561
Real Estate Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	5,281	4,457	5,204	4,058
Provision charged to operations	(56)	(36)	(395)	355
Losses charged to allowance	0	0	0	0
Recoveries	435	8	851	16
Allowance for credit losses, ending balance	5,660	4,429	5,660	4,429
Ending balance: individually evaluated for impairment	118		118		128
Ending balance: collectively evaluated for impairment	5,542		5,542		5,076
Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	894	765	734	1,078
Provision charged to operations	55	(26)	188	(730)
Losses charged to allowance	(105)	(42)	(114)	(73)
Recoveries	104	35	140	457
Allowance for credit losses, ending balance	948	732	948	732
Ending balance: individually evaluated for impairment	46		46		35
Ending balance: collectively evaluated for impairment	902		902		699
Unallocated
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	218	48	110	42
Provision charged to operations	74	(48)	182	(42)
Losses charged to allowance	0	0	0	0
Recoveries	0	0	0	0
Allowance for credit losses, ending balance	292	$ 0	292	$ 0
Ending balance: individually evaluated for impairment	0		0		0
Ending balance: collectively evaluated for impairment	$ 292		$ 292		$ 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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