Loans and Allowance for Credit Losses - Schedule of Non-Accrual Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Financing Receivable, Past Due [Line Items]
Non-Accrual Loans With ACL	$ 108,585	$ 133,303
Non-Accrual Loans Without ACL	29,083	39,036
Total Nonaccrual Loans	137,668	172,339
Commercial Portfolio Segment \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Non-Accrual Loans With ACL	184	8,810
Non-Accrual Loans Without ACL	3,953	3,284
Total Nonaccrual Loans	4,137	12,094
Commercial Portfolio Segment \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Non-Accrual Loans With ACL	67,944	70,010
Non-Accrual Loans Without ACL	24,192	35,402
Total Nonaccrual Loans	92,136	105,412
Commercial Portfolio Segment \| Commercial construction
Financing Receivable, Past Due [Line Items]
Non-Accrual Loans With ACL	0	17,400
Non-Accrual Loans Without ACL	0	0
Total Nonaccrual Loans	0	17,400
Commercial Portfolio Segment \| Business banking
Financing Receivable, Past Due [Line Items]
Non-Accrual Loans With ACL	12,567	11,319
Non-Accrual Loans Without ACL	938	350
Total Nonaccrual Loans	13,505	11,669
Residential Real Estate \| Residential real estate
Financing Receivable, Past Due [Line Items]
Non-Accrual Loans With ACL	21,939	19,219
Non-Accrual Loans Without ACL	0	0
Total Nonaccrual Loans	21,939	19,219
Consumer Portfolio Segment \| Consumer home equity
Financing Receivable, Past Due [Line Items]
Non-Accrual Loans With ACL	5,836	6,093
Non-Accrual Loans Without ACL	0	0
Total Nonaccrual Loans	5,836	6,093
Consumer Portfolio Segment \| Other Consumer
Financing Receivable, Past Due [Line Items]
Non-Accrual Loans With ACL	115	452
Non-Accrual Loans Without ACL	0	0
Total Nonaccrual Loans	$ 115	$ 452