ACL for Loans - ACL Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, beginning balance	$ 47,704
Provision (benefit) for credit losses on loans	530	$ 680
Allowance for credit losses, ending balance	48,424
Loans Excluding Unfunded Commitments
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, beginning balance	47,704	44,565
Provision (benefit) for credit losses on loans	825	610
Recoveries	33	61
Less: Charge-offs	138	1,897
Allowance for credit losses, ending balance	48,424	49,899
Cumulative Effect, Period of Adoption, Adjustment | Loans Excluding Unfunded Commitments
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, beginning balance		6,560
Commercial real estate | Loans Excluding Unfunded Commitments
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, beginning balance	31,847	26,755
Provision (benefit) for credit losses on loans	2,089	1,081
Recoveries	0	0
Less: Charge-offs	0	1,825
Allowance for credit losses, ending balance	33,936	33,675
Commercial real estate | Cumulative Effect, Period of Adoption, Adjustment | Loans Excluding Unfunded Commitments
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, beginning balance		7,664
Commercial and industrial | Loans Excluding Unfunded Commitments
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, beginning balance	9,574	9,516
Provision (benefit) for credit losses on loans	(543)	(263)
Recoveries	24	55
Less: Charge-offs	105	70
Allowance for credit losses, ending balance	8,950	11,226
Commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment | Loans Excluding Unfunded Commitments
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, beginning balance		1,988
Commercial construction | Loans Excluding Unfunded Commitments
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, beginning balance	4,090	6,129
Provision (benefit) for credit losses on loans	(572)	(230)
Recoveries	0	0
Less: Charge-offs	0	0
Allowance for credit losses, ending balance	3,518	3,483
Commercial construction | Cumulative Effect, Period of Adoption, Adjustment | Loans Excluding Unfunded Commitments
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, beginning balance		(2,416)
Residential mortgages | Loans Excluding Unfunded Commitments
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, beginning balance	1,405	1,530
Provision (benefit) for credit losses on loans	(83)	54
Recoveries	0	0
Less: Charge-offs	0	0
Allowance for credit losses, ending balance	1,322	889
Residential mortgages | Cumulative Effect, Period of Adoption, Adjustment | Loans Excluding Unfunded Commitments
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, beginning balance		(695)
Home equity loans and lines | Loans Excluding Unfunded Commitments
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, beginning balance	465	467
Provision (benefit) for credit losses on loans	(15)	(22)
Recoveries	4	5
Less: Charge-offs	0	0
Allowance for credit losses, ending balance	454	292
Home equity loans and lines | Cumulative Effect, Period of Adoption, Adjustment | Loans Excluding Unfunded Commitments
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, beginning balance		(158)
Consumer | Loans Excluding Unfunded Commitments
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, beginning balance	323	168
Provision (benefit) for credit losses on loans	(51)	(10)
Recoveries	5	1
Less: Charge-offs	33	2
Allowance for credit losses, ending balance	$ 244	334
Consumer | Cumulative Effect, Period of Adoption, Adjustment | Loans Excluding Unfunded Commitments
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, beginning balance		$ 177