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Commitments and Contingencies - Schedule of Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Commitments to originate loans and leases:    
Unadvanced portion of loans and leases $ 2,512,536 $ 1,076,783
Unused lines of credit:    
Home equity 1,151,832 780,214
Other consumer 135,404 113,838
Other commercial 0 398
Unused letters of credit:    
Financial standby letters of credit 11,038 12,702
Performance standby letters of credit 25,388 24,325
Commercial and similar letters of credit 46,232 2,330
Interest rate derivatives    
Unused letters of credit:    
Notional amount 216,667 225,000
Receive fixed, pay variable    
Unused letters of credit:    
Notional amount 3,539,080 1,672,948
Pay fixed, receive variable    
Unused letters of credit:    
Notional amount 3,543,667 1,672,948
Risk participation-out agreements    
Unused letters of credit:    
Notional amount 648,328 539,731
Risk participation-in agreements    
Unused letters of credit:    
Notional amount 169,155 102,198
Foreign exchange contracts | Buys foreign currency, sells U.S. currency    
Unused letters of credit:    
Notional amount 3,385 5,849
Foreign exchange contracts | Sells foreign currency, buys U.S. currency    
Unused letters of credit:    
Notional amount 3,701 5,408
Commercial real estate    
Commitments to originate loans and leases:    
Commitments to originate loans and leases 92,170 11,126
Commercial    
Commitments to originate loans and leases:    
Commitments to originate loans and leases 148,835 144,721
Residential mortgage    
Commitments to originate loans and leases:    
Commitments to originate loans and leases 51,413 14,607
Home equity    
Commitments to originate loans and leases:    
Commitments to originate loans and leases $ 6,793 $ 0