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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2025
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Financial Instruments with Off-balance Sheet Risk | Financial instruments with off-balance-sheet risk at the dates indicated follow:
| At December 31,
| 2025 |  | 2024
| (In Thousands)
Financial instruments whose contract amounts represent credit risk: |  |  |
Commitments to originate loans and leases: |  |  |
Commercial real estate | $ | 99,457 |  |  | $ | 11,126 |
Commercial | 137,923 |  |  | 144,721 |
Residential mortgage | 23,115 |  |  | 14,607 |
Home equity | 9,022 |  |  | — |
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 | — |  |  | 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 (notional amounts) | 192,468 |  |  | 225,000 |
Loan level derivatives (notional amounts): |  |  |
Receive fixed, pay variable | 3,505,840 |  |  | 1,672,948 |
Pay fixed, receive variable | 3,505,840 |  |  | 1,672,948 |
Risk participation-out agreements | 670,834 |  |  | 539,731 |
Risk participation-in agreements | 153,185 |  |  | 102,198 |
Foreign exchange contracts (notional amounts): |  |  |
Buys foreign currency, sells U.S. currency | 2,785 |  |  | 5,849 |
Sells foreign currency, buys U.S. currency | 2,800 |  |  | 5,408 |
Schedule of Lease Cost, Supplemental Cash Flow and Supplemental Balance Sheet Information |
| At December 31, 2025 | At December 31, 2024 | At December 31, 2023
| (In Thousands)
The components of lease expense were as follow: |  |  |
Operating lease cost | $ | 11,293 |  | $ | 8,983 |  | $ | 8,527 |
Supplemental cash flow information related to leases was as follows: |  |  |
Cash paid for amounts included in the measurement of lease liabilities: |  |  |
Operating cash flows for operating leases | $ | 12,294 |  | $ | 9,044 |  | $ | 8,901 |
Right-of-use assets obtained in exchange for new lease obligations: |  |  |
Operating leases assets | $ | 46,186 |  | $ | 18,093 |  | $ | 15,073 |
Operating leases liabilities | $ | 53,127 |  | $ | 18,093 |  | $ | 16,672 |
Supplemental balance sheet information related to leases was as follows: |  |  |
Operating Leases |  |  |
Operating lease right-of-use assets | $ | 82,817 |  | $ | 43,527 |  | $ | 30,863 |
Operating lease liabilities | 90,713 |  | 44,785 |  | 31,998 |
Weighted Average Remaining Lease Term |  |  |
Operating leases | 7.95 years | 8.90 | 8.87
Weighted Average Discount Rate |  |  |
Operating leases | 4.2 | % | 4.1 | % | 4.0 | %
Schedule of Maturities of Operating Leases | A summary of future minimum rental payments under such leases at the dates indicated follows:
Year ended December 31, | Minimum Rental Payments
| (In Thousands)
2026 | $ | 18,702 |
2027 | 17,372 |
2028 | 14,712 |
2029 | 11,741 |
2030 | 9,166 |
Thereafter | 34,280 |
Total | $ | 105,973 |
Less imputed interest | (15,260) |
| $ | 90,713 |

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-6 + Details
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