Loans and Loans Held for Sale - Summary of Restructured Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	$ 181	$ 689	$ 2,077	$ 8,513
Commercial real estate | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	0	0	0	0
Commercial and industrial | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	0	341	0	5,968
Commercial construction | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	0	0	0	0
Business banking | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	0	0	0	1,500
Consumer real estate | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	172	348	2,066	1,045
Other Consumer | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans	$ 9	$ 0	11	$ 0
Total TDRs
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			12,785		$ 31,695
Total TDRs | Commercial real estate | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			480		1,697
Total TDRs | Commercial and industrial | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			658		15,637
Total TDRs | Commercial construction | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			1,674		4,277
Total TDRs | Business banking | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			1,699		2,554
Total TDRs | Consumer real estate | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			8,260		7,527
Total TDRs | Other Consumer | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			14		3
Accruing TDRs
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			8,925		9,921
Accruing TDRs | Commercial real estate | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			0		0
Accruing TDRs | Commercial and industrial | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			658		748
Accruing TDRs | Commercial construction | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			1,674		2,190
Accruing TDRs | Business banking | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			607		858
Accruing TDRs | Consumer real estate | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			5,981		6,122
Accruing TDRs | Other Consumer | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			5		3
Nonaccruing TDRs
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			3,860		21,774
Nonaccruing TDRs | Commercial real estate | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			480		1,697
Nonaccruing TDRs | Commercial and industrial | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			0		14,889
Nonaccruing TDRs | Commercial construction | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			0		2,087
Nonaccruing TDRs | Business banking | Commercial Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			1,092		1,696
Nonaccruing TDRs | Consumer real estate | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			2,279		1,405
Nonaccruing TDRs | Other Consumer | Consumer Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Restructured loans			$ 9		$ 0