Loans - Allowance for Loan Losses (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest	$ 26,956	$ 28,446	$ 26,956	$ 28,446	$ 29,232
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning balance	27,010	26,300	29,232
Charge-offs	(444)	(392)	(1,520)
Recoveries	291	267	830
Provision	99	2,271	(286)	8,083
Allowance for Loan Losses, Ending balance	$ 26,956	28,446	$ 26,956	28,446
Number of loans individually evaluated for impairment | loan	6		6
Number of loans with an allowance for credit loss on loans individually evaluated for impairment | loan	1		1
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Ending Loan Balance - Collectively Evaluated	$ 2,646,821	2,589,729	$ 2,646,821	2,589,729	2,592,327
Allowance for loan losses - Loans Collectively Evaluated	26,340	28,400	26,340	28,400	29,191
Ending Loan Balance - Individually Evaluated	7,930	2,726	7,930	2,726	2,703
Allowance for loan losses - Loans Individually Evaluated	616	46	616	46	41
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest					(1,300)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning balance			(1,300)
Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest					27,932
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning balance			27,932
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest	2,288	11,145	2,288	11,145	11,562
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning balance	2,443	10,639	11,562
Charge-offs	(427)	(370)	(1,480)
Recoveries	291	267	830
Provision	(19)	609	759
Allowance for Loan Losses, Ending balance	2,288	11,145	2,288	11,145
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Ending Loan Balance - Collectively Evaluated	921,189	849,402	921,189	849,402	859,657
Allowance for loan losses - Loans Collectively Evaluated	2,288	11,145	2,288	11,145	11,562
Ending Loan Balance - Individually Evaluated	0	124	0	124	111
Allowance for loan losses - Loans Individually Evaluated	0	0	0	0	0
Consumer | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest					(9,383)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning balance			(9,383)
Consumer | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest					2,179
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning balance			2,179
Residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest	8,573	5,613	8,573	5,613	5,507
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning balance	8,720	5,383	5,507
Charge-offs	0	0	(3)
Recoveries	0	0	0
Provision	(147)	230	(866)
Allowance for Loan Losses, Ending balance	8,573	5,613	8,573	5,613
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Ending Loan Balance - Collectively Evaluated	929,614	924,348	929,614	924,348	921,504
Allowance for loan losses - Loans Collectively Evaluated	8,573	5,585	8,573	5,585	5,485
Ending Loan Balance - Individually Evaluated	676	1,427	676	1,427	1,417
Allowance for loan losses - Loans Individually Evaluated	0	28	0	28	22
Residential | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest					3,935
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning balance			3,935
Residential | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest					9,442
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning balance			9,442
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest	2,424	2,319	2,424	2,319	2,173
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning balance	2,241	1,917	2,173
Charge-offs	(17)	(17)	(37)
Recoveries	0	0	0
Provision	200	419	(1,796)
Allowance for Loan Losses, Ending balance	2,424	2,319	2,424	2,319
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Ending Loan Balance - Collectively Evaluated	188,191	275,874	188,191	275,874	240,507
Allowance for loan losses - Loans Collectively Evaluated	2,424	2,301	2,424	2,301	2,154
Ending Loan Balance - Individually Evaluated	0	47	0	47	47
Allowance for loan losses - Loans Individually Evaluated	0	18	0	18	19
Commercial | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest					2,084
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning balance			2,084
Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest					4,257
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning balance			4,257
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest	13,671	9,369	13,671	9,369	9,990
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning balance	13,606	8,361	9,990
Charge-offs	0	(5)	0
Recoveries	0	0	0
Provision	65	1,013	1,617
Allowance for Loan Losses, Ending balance	13,671	9,369	13,671	9,369
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Ending Loan Balance - Collectively Evaluated	607,827	540,105	607,827	540,105	570,659
Allowance for loan losses - Loans Collectively Evaluated	13,055	9,369	13,055	9,369	9,990
Ending Loan Balance - Individually Evaluated	7,254	1,128	7,254	1,128	1,128
Allowance for loan losses - Loans Individually Evaluated	$ 616	$ 0	616	$ 0	0
Commercial Real Estate | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest					2,064
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning balance			2,064
Commercial Real Estate | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest					$ 12,054
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses, Beginning balance			$ 12,054