Loans - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	$ 26,300	$ 20,695	$ 21,187	$ 20,196
Charge-offs	(392)	(402)	(1,360)	(1,232)
Recoveries	267	120	536	522
Provision	2,271	518	8,083	1,445
Allowance for Loan Losses, Ending Balance	28,446	20,931	28,446	20,931
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	46	5	46	5	$ 47
Allowance for loan losses - Loans Collectively Evaluated for Impairment	28,400	20,926	28,400	20,926	21,140
Ending Loan Balance - Individually Evaluated for Impairment	2,726	724	2,726	724	1,101
Ending Loan Balance - Collectively Evaluated for Impairment	2,589,729	2,334,867	2,589,729	2,334,867	2,385,019
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	1,917	1,231	1,386	1,218
Charge-offs	(17)	(11)	(37)	(12)
Recoveries	0	0	3	98
Provision	419	42	967	(42)
Allowance for Loan Losses, Ending Balance	2,319	1,262	2,319	1,262
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	18	5	18	5	5
Allowance for loan losses - Loans Collectively Evaluated for Impairment	2,301	1,257	2,301	1,257	1,381
Ending Loan Balance - Individually Evaluated for Impairment	47	36	47	36	35
Ending Loan Balance - Collectively Evaluated for Impairment	275,874	142,099	275,874	142,099	150,625
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	8,361	5,459	5,830	5,644
Charge-offs	(5)	0	(5)	(29)
Recoveries	0	0	0	0
Provision	1,013	162	3,544	6
Allowance for Loan Losses, Ending Balance	9,369	5,621	9,369	5,621
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	9,369	5,621	9,369	5,621	5,830
Ending Loan Balance - Individually Evaluated for Impairment	1,128	0	1,128	0	0
Ending Loan Balance - Collectively Evaluated for Impairment	540,105	498,083	540,105	498,083	510,541
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	10,639	9,654	9,408	8,882
Charge-offs	(370)	(351)	(1,268)	(1,137)
Recoveries	267	120	533	424
Provision	609	263	2,472	1,517
Allowance for Loan Losses, Ending Balance	11,145	9,686	11,145	9,686
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	11,145	9,686	11,145	9,686	9,408
Ending Loan Balance - Individually Evaluated for Impairment	124	113	124	113	107
Ending Loan Balance - Collectively Evaluated for Impairment	849,402	805,684	849,402	805,684	811,091
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning Balance	5,383	4,351	4,563	4,452
Charge-offs	0	(40)	(50)	(54)
Recoveries	0	0	0	0
Provision	230	51	1,100	(36)
Allowance for Loan Losses, Ending Balance	5,613	4,362	5,613	4,362
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	28	0	28	0	42
Allowance for loan losses - Loans Collectively Evaluated for Impairment	5,585	4,362	5,585	4,362	4,521
Ending Loan Balance - Individually Evaluated for Impairment	1,427	575	1,427	575	959
Ending Loan Balance - Collectively Evaluated for Impairment	$ 924,348	$ 889,001	$ 924,348	$ 889,001	$ 912,762