Loans and Allowance for Credit Losses - Changes in Allowance for Credit Losses (Details) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($) quarter	Dec. 31, 2018 USD ($)	Dec. 31, 2017 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	$ 9,104	$ 8,778	$ 9,326
Provision charged to operations	1,025	50	(1,150)
Losses charged to allowance	(1,196)	(210)	(464)
Recoveries	197	486	1,066
Allowance for credit losses, ending balance	9,130	9,104	8,778
Ending balance: individually evaluated for impairment	40	90
Ending balance: collectively evaluated for impairment	9,090	9,014
Commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	1,671	2,071	2,180
Provision charged to operations	655	(513)	(762)
Losses charged to allowance	(1,032)	(94)	(207)
Recoveries	134	207	860
Allowance for credit losses, ending balance	1,428	1,671	2,071
Ending balance: individually evaluated for impairment	2	9
Ending balance: collectively evaluated for impairment	1,426	1,662
Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	6,539	5,795	6,200
Provision charged to operations	230	642	(449)
Losses charged to allowance	0	0	(22)
Recoveries	0	102	66
Allowance for credit losses, ending balance	6,769	6,539	5,795
Ending balance: individually evaluated for impairment	3	27
Ending balance: collectively evaluated for impairment	6,766	6,512
Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	826	825	852
Provision charged to operations	172	(60)	68
Losses charged to allowance	(164)	(116)	(235)
Recoveries	63	177	140
Allowance for credit losses, ending balance	897	826	825
Ending balance: individually evaluated for impairment	35	54
Ending balance: collectively evaluated for impairment	862	772
Unallocated
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	68	87	94
Provision charged to operations	(32)	(19)	(7)
Losses charged to allowance	0	0	0
Recoveries	0	0	0
Allowance for credit losses, ending balance	36	68	$ 87
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	$ 36	$ 68

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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