Loans - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	$ 23,637	$ 20,373	$ 21,187	$ 20,196
Charge-offs	(487)	(368)	(968)	(830)
Recoveries	110	235	269	402
Provision	3,040	455	5,812	927
Allowance for Loan Losses, Ending Balance	26,300	20,695	26,300	20,695
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	56	5	56	5	$ 47
Allowance for loan losses - Loans Collectively Evaluated for Impairment	26,244	20,690	26,244	20,690	21,140
Ending Loan Balance - Individually Evaluated for Impairment	2,253	2,564	2,253	2,564	1,101
Ending Loan Balance - Collectively Evaluated for Impairment	2,559,662	2,277,744	2,559,662	2,277,744	2,385,019
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	1,639	1,250	1,386	1,218
Charge-offs	(6)	0	(20)	(1)
Recoveries	3	0	3	0
Provision	281	(19)	548	14
Allowance for Loan Losses, Ending Balance	1,917	1,231	1,917	1,231
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	19	5	19	5	5
Allowance for loan losses - Loans Collectively Evaluated for Impairment	1,898	1,226	1,898	1,226	1,381
Ending Loan Balance - Individually Evaluated for Impairment	51	37	51	37	35
Ending Loan Balance - Collectively Evaluated for Impairment	276,620	138,294	276,620	138,294	150,625
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	7,065	5,589	5,830	5,644
Charge-offs	0	0	0	(29)
Recoveries	0	0	0	0
Provision	1,296	(130)	2,531	(156)
Allowance for Loan Losses, Ending Balance	8,361	5,459	8,361	5,459
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	0	0	0	0
Allowance for loan losses - Loans Collectively Evaluated for Impairment	8,361	5,459	8,361	5,459	5,830
Ending Loan Balance - Individually Evaluated for Impairment	1,134	1	1,134	1	0
Ending Loan Balance - Collectively Evaluated for Impairment	531,898	490,273	531,898	490,273	510,541
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	10,004	9,409	9,408	8,882
Charge-offs	(431)	(368)	(898)	(786)
Recoveries	107	235	266	402
Provision	959	378	1,863	1,156
Allowance for Loan Losses, Ending Balance	10,639	9,654	10,639	9,654
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	0	0	0	0
Allowance for loan losses - Loans Collectively Evaluated for Impairment	10,639	9,654	10,639	9,654	9,408
Ending Loan Balance - Individually Evaluated for Impairment	116	124	116	124	107
Ending Loan Balance - Collectively Evaluated for Impairment	828,377	778,900	828,377	778,900	811,091
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	4,929	4,125	4,563	4,452
Charge-offs	(50)	0	(50)	(14)
Recoveries	0	0	0	0
Provision	504	226	870	(87)
Allowance for Loan Losses, Ending Balance	5,383	4,351	5,383	4,351
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	37	0	37	0	42
Allowance for loan losses - Loans Collectively Evaluated for Impairment	5,346	4,351	5,346	4,351	4,521
Ending Loan Balance - Individually Evaluated for Impairment	952	2,402	952	2,402	959
Ending Loan Balance - Collectively Evaluated for Impairment	$ 922,767	$ 870,277	$ 922,767	$ 870,277	$ 912,762

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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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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 increase in allowance for credit loss on financing receivable from recovery.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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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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