Loans and Allowance for Credit Losses - Changes in Allowance for Credit Losses (Details) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($) quarter	Dec. 31, 2017 USD ($)	Dec. 31, 2016 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	$ 8,778	$ 9,326	$ 9,610
Provision charged to operations	50	(1,150)	(5,850)
Losses charged to allowance	(210)	(464)	(883)
Recoveries	486	1,066	6,449
Allowance for credit losses, ending balance	9,104	8,778	9,326
Ending balance: individually evaluated for impairment	90	36
Ending balance: collectively evaluated for impairment	9,014	8,742
Commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	2,071	2,180	3,562
Provision charged to operations	(513)	(762)	(6,048)
Losses charged to allowance	(94)	(207)	(621)
Recoveries	207	860	5,287
Allowance for credit losses, ending balance	1,671	2,071	2,180
Ending balance: individually evaluated for impairment	9	1
Ending balance: collectively evaluated for impairment	1,662	2,070
Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	5,795	6,200	5,204
Provision charged to operations	642	(449)	11
Losses charged to allowance	0	(22)	0
Recoveries	102	66	985
Allowance for credit losses, ending balance	6,539	5,795	6,200
Ending balance: individually evaluated for impairment	27	1
Ending balance: collectively evaluated for impairment	6,512	5,794
Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	825	852	734
Provision charged to operations	(60)	68	203
Losses charged to allowance	(116)	(235)	(262)
Recoveries	177	140	177
Allowance for credit losses, ending balance	826	825	852
Ending balance: individually evaluated for impairment	54	34
Ending balance: collectively evaluated for impairment	772	791
Unallocated
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	87	94	110
Provision charged to operations	(19)	(7)	(16)
Losses charged to allowance	0	0	0
Recoveries	0	0	0
Allowance for credit losses, ending balance	68	87	$ 94
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	$ 68	$ 87

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

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

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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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