Loans and Allowance for Credit Losses - Changes in Allowance for Credit Losses (Details) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) quarter	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of rolling quarters used in analysis \| quarter	20
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	$ 9,326	$ 9,610	$ 8,308
Provision charged to operations	(1,150)	(5,850)	600
Losses charged to allowance	(464)	(883)	(961)
Recoveries	1,066	6,449	1,663
Allowance for credit losses, ending balance	8,778	9,326	9,610
Ending balance: individually evaluated for impairment	36	307
Ending balance: collectively evaluated for impairment	8,742	9,019
Commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	2,180	3,562	3,130
Provision charged to operations	(762)	(6,048)	190
Losses charged to allowance	(207)	(621)	(802)
Recoveries	860	5,287	1,044
Allowance for credit losses, ending balance	2,071	2,180	3,562
Ending balance: individually evaluated for impairment	1	3
Ending balance: collectively evaluated for impairment	2,070	2,177
Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	6,200	5,204	4,058
Provision charged to operations	(449)	11	1,114
Losses charged to allowance	(22)	0	0
Recoveries	66	985	32
Allowance for credit losses, ending balance	5,795	6,200	5,204
Ending balance: individually evaluated for impairment	1	241
Ending balance: collectively evaluated for impairment	5,794	5,959
Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	852	734	1,078
Provision charged to operations	68	203	(772)
Losses charged to allowance	(235)	(262)	(159)
Recoveries	140	177	587
Allowance for credit losses, ending balance	825	852	734
Ending balance: individually evaluated for impairment	34	63
Ending balance: collectively evaluated for impairment	791	789
Unallocated
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	94	110	42
Provision charged to operations	(7)	(16)	68
Losses charged to allowance	0	0	0
Recoveries	0	0	0
Allowance for credit losses, ending balance	87	94	$ 110
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	$ 87	$ 94

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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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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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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