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Commitments and Contingencies - Schedule of Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Loan Commitments [Line Items]    
Unadvanced portion of loans and leases $ 2,483,239 $ 1,076,783
Unused lines of credit:    
Home equity 1,175,702 780,214
Other consumer 148,358 113,838
Other commercial 0 398
Unused letters of credit:    
Financial standby letters of credit 10,440 12,702
Performance standby letters of credit 25,025 24,325
Commercial and similar letters of credit 58,074 2,330
Interest rate derivatives    
Unused letters of credit:    
Notional Amount 192,468 225,000
Receive fixed, pay variable    
Unused letters of credit:    
Notional Amount 3,505,840 1,672,948
Pay fixed, receive variable    
Unused letters of credit:    
Notional Amount 3,505,840 1,672,948
Risk participation-out agreements    
Unused letters of credit:    
Notional Amount 670,834 539,731
Risk participation-in agreements    
Unused letters of credit:    
Notional Amount 153,185 102,198
Foreign exchange contracts | Buys foreign currency, sells U.S. currency    
Unused letters of credit:    
Notional Amount 2,785 5,849
Foreign exchange contracts | Sells foreign currency, buys U.S. currency    
Unused letters of credit:    
Notional Amount 2,800 5,408
Commercial real estate    
Loan Commitments [Line Items]    
Commitments to originate loans and leases 99,457 11,126
Commercial    
Loan Commitments [Line Items]    
Commitments to originate loans and leases 137,923 144,721
Residential mortgage    
Loan Commitments [Line Items]    
Commitments to originate loans and leases 23,115 14,607
Home equity    
Loan Commitments [Line Items]    
Commitments to originate loans and leases $ 9,022 $ 0