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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) quarter component	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of primary components | component	2
Lookback period used in reserve analysis | quarter	20
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	$ 9,104	$ 8,778
Provision charged to operations	(25)	0
Losses charged to allowance	(9)	(92)
Recoveries	48	102
Allowance for credit losses, ending balance	9,118	8,788
Ending balance: individually evaluated for impairment	101		$ 90
Ending balance: collectively evaluated for impairment	9,017		9,014
Commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	1,671	2,071
Provision charged to operations	(252)	(356)
Losses charged to allowance	0	(50)
Recoveries	31	71
Allowance for credit losses, ending balance	1,450	1,736
Ending balance: individually evaluated for impairment	20		9
Ending balance: collectively evaluated for impairment	1,430		1,662
Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	6,539	5,795
Provision charged to operations	170	331
Losses charged to allowance	0	0
Recoveries	0	5
Allowance for credit losses, ending balance	6,709	6,131
Ending balance: individually evaluated for impairment	30		27
Ending balance: collectively evaluated for impairment	6,679		6,512
Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	826	825
Provision charged to operations	61	3
Losses charged to allowance	(9)	(42)
Recoveries	17	26
Allowance for credit losses, ending balance	895	812
Ending balance: individually evaluated for impairment	51		54
Ending balance: collectively evaluated for impairment	844		772
Unallocated
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	68	87
Provision charged to operations	(4)	22
Losses charged to allowance	0	0
Recoveries	0	0
Allowance for credit losses, ending balance	64	$ 109
Ending balance: individually evaluated for impairment	0		0
Ending balance: collectively evaluated for impairment	$ 64		$ 68

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- Definition

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

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A valuation allowance for financing receivables that are expected to be uncollectible.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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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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