Loans and Allowance for Credit Losses - Allowance for Credit Losses (Details) $ in Thousands	3 Months Ended
Mar. 31, 2017 USD ($) quarter	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Lookback period used in reserve analysis \| quarter	20
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	$ 9,326	$ 9,610
Provision charged to operations	(100)	(250)
Losses charged to allowance	(182)	(13)
Recoveries	170	789
Allowance for credit losses, ending balance	9,214	10,136
Ending balance: individually evaluated for impairment	219		$ 307
Ending balance: collectively evaluated for impairment	8,995		9,019
Commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	2,180	3,562
Provision charged to operations	(237)	(152)
Losses charged to allowance	(44)	(4)
Recoveries	122	337
Allowance for credit losses, ending balance	2,021	3,743
Ending balance: individually evaluated for impairment	1		3
Ending balance: collectively evaluated for impairment	2,020		2,177
Real Estate Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	6,200	5,204
Provision charged to operations	43	(340)
Losses charged to allowance	(22)	0
Recoveries	4	417
Allowance for credit losses, ending balance	6,225	5,281
Ending balance: individually evaluated for impairment	217		241
Ending balance: collectively evaluated for impairment	6,008		5,959
Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	852	734
Provision charged to operations	(5)	134
Losses charged to allowance	(116)	(9)
Recoveries	44	35
Allowance for credit losses, ending balance	775	894
Ending balance: individually evaluated for impairment	1		63
Ending balance: collectively evaluated for impairment	774		789
Unallocated
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	94	110
Provision charged to operations	99	108
Losses charged to allowance	0	0
Recoveries	0	0
Allowance for credit losses, ending balance	193	$ 218
Ending balance: individually evaluated for impairment	0		0
Ending balance: collectively evaluated for impairment	$ 193		$ 94

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

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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- Definition

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.

+ References

No definition available.

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- Definition

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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