Loans and Allowance for Credit Losses - Allowance for Credit Losses (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017 USD ($) quarter component	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) quarter component	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of primary components \| component	2		2
Lookback period used in reserve analysis \| quarter	20		20
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	$ 9,297	$ 9,872	$ 9,326	$ 9,610
Provision charged to operations	(900)	(1,000)	(1,150)	(5,850)
Losses charged to allowance	(22)	(530)	(232)	(647)
Recoveries	541	957	972	6,186
Allowance for credit losses, ending balance	8,916	9,299	8,916	9,299
Ending balance: individually evaluated for impairment	56		56		$ 307
Ending balance: collectively evaluated for impairment	8,860		8,860		9,019
Commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	2,196	2,972	2,180	3,562
Provision charged to operations	(532)	(963)	(776)	(5,787)
Losses charged to allowance	(4)	(494)	(48)	(499)
Recoveries	514	803	818	5,042
Allowance for credit losses, ending balance	2,174	2,318	2,174	2,318
Ending balance: individually evaluated for impairment	1		1		3
Ending balance: collectively evaluated for impairment	2,173		2,173		2,177
Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	5,931	5,660	6,200	5,204
Provision charged to operations	(251)	259	(554)	(136)
Losses charged to allowance	0	0	(22)	0
Recoveries	5	131	61	982
Allowance for credit losses, ending balance	5,685	6,050	5,685	6,050
Ending balance: individually evaluated for impairment	25		25		241
Ending balance: collectively evaluated for impairment	5,660		5,660		5,959
Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	793	948	852	734
Provision charged to operations	(35)	(23)	(21)	164
Losses charged to allowance	(18)	(36)	(162)	(148)
Recoveries	22	23	93	162
Allowance for credit losses, ending balance	762	912	762	912
Ending balance: individually evaluated for impairment	30		30		63
Ending balance: collectively evaluated for impairment	732		732		789
Unallocated
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	377	292	94	110
Provision charged to operations	(82)	(273)	201	(91)
Losses charged to allowance	0	0	0	0
Recoveries	0	0	0	0
Allowance for credit losses, ending balance	295	$ 19	295	$ 19
Ending balance: individually evaluated for impairment	0		0		0
Ending balance: collectively evaluated for impairment	$ 295		$ 295		$ 94

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

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- Definition

Loans and Leases Receivable, Allowance, Number of Components

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No definition available.

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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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- Definition

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

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- Definition

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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No definition available.

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

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- Definition

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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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=84173941&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=98514028&loc=d3e3602-108585

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