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Loans and Allowance for Credit Losses - Changes in Allowance for Credit Losses (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) quarter	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of rolling quarters used in analysis | quarter	48
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	$ 9,130	$ 9,104	$ 8,778
Provision charged to operations	3,275	1,025	50
Losses charged to allowance	(229)	(1,196)	(210)
Recoveries	739	197	486
Allowance for credit losses, ending balance	12,915	9,130	9,104
Ending balance: individually evaluated for impairment	631	40
Ending balance: collectively evaluated for impairment	12,284	9,090
Commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	1,428	1,671	2,071
Provision charged to operations	100	655	(513)
Losses charged to allowance	(121)	(1,032)	(94)
Recoveries	612	134	207
Allowance for credit losses, ending balance	2,019	1,428	1,671
Ending balance: individually evaluated for impairment	339	2
Ending balance: collectively evaluated for impairment	1,680	1,426
Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	6,769	6,539	5,795
Provision charged to operations	2,405	230	642
Losses charged to allowance	0	0	0
Recoveries	0	0	102
Allowance for credit losses, ending balance	9,174	6,769	6,539
Ending balance: individually evaluated for impairment	271	3
Ending balance: collectively evaluated for impairment	8,903	6,766
Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	897	826	825
Provision charged to operations	175	172	(60)
Losses charged to allowance	(108)	(164)	(116)
Recoveries	127	63	177
Allowance for credit losses, ending balance	1,091	897	826
Ending balance: individually evaluated for impairment	21	35
Ending balance: collectively evaluated for impairment	1,070	862
Unallocated
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	36	68	87
Provision charged to operations	595	(32)	(19)
Losses charged to allowance	0	0	0
Recoveries	0	0	0
Allowance for credit losses, ending balance	631	36	$ 68
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	$ 631	$ 36

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

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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