Loans and Allowance for Credit Losses - Summary of TDR Loans on Accrual and Nonaccrual (Details) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2023 contract	Sep. 30, 2023 contract	Dec. 31, 2022 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans	21	38	257
Balance of Loans			$ 48,185
TDRs on Accrual Status | Special mention | Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			179
Balance of Loans			$ 28,834
TDRs on Non-Accrual Status | Special mention | Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			78
Balance of Loans			$ 19,351
Commercial and industrial | Commercial Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans	3	4	11
Balance of Loans			$ 15,766
Commercial and industrial | TDRs on Accrual Status | Commercial Portfolio Segment | Special mention | Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			2
Balance of Loans			$ 4,449
Commercial and industrial | TDRs on Non-Accrual Status | Commercial Portfolio Segment | Special mention | Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			9
Balance of Loans			$ 11,317
Business banking | Commercial Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans	9	20	33
Balance of Loans			$ 6,225
Business banking | TDRs on Accrual Status | Commercial Portfolio Segment | Special mention | Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			11
Balance of Loans			$ 4,124
Business banking | TDRs on Non-Accrual Status | Commercial Portfolio Segment | Special mention | Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			22
Balance of Loans			$ 2,101
Residential real estate | Residential Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans	5	8	142
Balance of Loans			$ 21,634
Residential real estate | TDRs on Accrual Status | Residential Real Estate | Special mention | Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			114
Balance of Loans			$ 17,618
Residential real estate | TDRs on Non-Accrual Status | Residential Real Estate | Special mention | Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			28
Balance of Loans			$ 4,016
Consumer home equity | Consumer Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans	4	6	70
Balance of Loans			$ 4,549
Consumer home equity | TDRs on Accrual Status | Consumer Portfolio Segment | Special mention | Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			51
Balance of Loans			$ 2,632
Consumer home equity | TDRs on Non-Accrual Status | Consumer Portfolio Segment | Special mention | Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			19
Balance of Loans			$ 1,917
Other Consumer | Consumer Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			1
Balance of Loans			$ 11
Other Consumer | TDRs on Accrual Status | Consumer Portfolio Segment | Special mention | Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			1
Balance of Loans			$ 11
Other Consumer | TDRs on Non-Accrual Status | Consumer Portfolio Segment | Special mention | Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan			0
Balance of Loans			$ 0