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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2025
Income Tax Disclosure [Abstract] |
Schedule of Income Tax Expense | Income tax expense is comprised of the following amounts:
| Year Ended December 31,
| 2025 |  | 2024 |  | 2023
| (In Thousands)
Current provision: |  |  |  |  |
Federal | $ | 7,175 |  |  | $ | 16,464 |  |  | $ | 960 |
State | 2,068 |  |  | 6,120 |  |  | 1,788 |
Total current provision | 9,243 |  |  | 22,584 |  |  | 2,748 |
Deferred provision (benefit) |  |  |  |  |
Federal | 14,063 |  |  | 912 |  |  | 12,922 |
State | 8,285 |  |  | (520) |  |  | 3,245 |
Total deferred provision (benefit) | 22,348 |  |  | 392 |  |  | 16,167 |
Total provision for income taxes | $ | 31,591 |  |  | $ | 22,976 |  |  | $ | 18,915 |
Schedule of Reconciliation of Effective Income Tax Expense | Income tax expense is comprised of the following amounts:
| Year Ended December 31,
| 2025
| (Dollars In Thousands)
Expected income tax expense at statutory federal tax rate | $ | 25,591 |  |  | 21.0 | %
State taxes, net of federal income tax benefit (1) | 8,192 |  |  | 6.7 | %
Tax credit investments |  |  |
Investments in affordable housing and new markets tax credits (2) | (1,391) |  |  | (1.1) | %
Investments in historic tax credits (3) | (526) |  |  | (0.4) | %
Nontaxable or non deductible items |  |  |
Tax-exempt interest income | (2,307) |  |  | (1.9) | %
Bank-owned life insurance | (954) |  |  | (0.8) | %
Merger and restructuring expense | 1,250 |  |  | 1.0 | %
Other non deductible items | 1,584 |  |  | 1.3 | %
Other adjustments | 152 |  |  | 0.1 | %
Total provision for income taxes | $ | 31,591 |  |  | 25.9 | %
_________________________________________________________________________ (1) State taxes in Massachusetts and New York make up the majority (greater than 50%) of the tax effect in this category of the rate reconciliation. (2) Company has adopted proportional amortization for these investments. Therefore, the tax credit category includes the tax credit, net of the proportional amortization. (3) Company has adopted the deferral method for these investments. Therefore, the tax credit category includes the tax benefit for these credits. Income tax expense is comprised of the following amounts:
| Year Ended December 31,
| 2024 |  | 2023
| (Dollars In Thousands)
Expected income tax expense at statutory federal tax rate | $ | 19,255 |  |  | 21.0 | % |  | $ | 19,722 |  |  | 21.0 | %
State taxes, net of federal income tax benefit | 4,395 |  |  | 4.8 | % |  | 3,977 |  |  | 4.2 | %
Bank-owned life insurance | (424) |  |  | (0.5) | % |  | (443) |  |  | (0.5) | %
Tax-exempt interest income | (597) |  |  | (0.7) | % |  | (307) |  |  | (0.3) | %
Merger and restructuring expense | 528 |  |  | 0.6 | % |  | 159 |  |  | 0.2 | %
Energy tax credits | — |  |  | — | % |  | (4,504) |  |  | (4.8) | %
Investments in affordable housing projects | (607) |  |  | (0.7) | % |  | (917) |  |  | (1.0) | %
Other, net | 426 |  |  | 0.5 | % |  | 1,228 |  |  | 1.3 | %
Total provision for income taxes | $ | 22,976 |  |  | 25.0 | % |  | $ | 18,915 |  |  | 20.1 | %
Schedule of Cash Flow, Supplemental Disclosures | The amount of income taxes paid (net of refunds received) for federal and state taxes:
| 2025
| (Dollars In Thousands)
Federal | $ | 9,171 |
State: |
Massachusetts | $ | 4,160 |
New York | 863 |
Other | 774 |
Total state | $ | 5,797 |
Total federal and state | $ | 14,968 |
Schedule of Components of Deferred Tax Assets and Liabilities | The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and liabilities at the dates indicated are as follows:
| At December 31,
| 2025 |  | 2024
| (In Thousands)
Deferred tax assets: |  |  |
Allowance for credit losses | $ | 73,001 |  |  | $ | 35,163 |
Operating leases - liability | 24,051 |  |  | 11,924 |
Deferred compensation | 10,364 |  |  | 4,088 |
Identified intangible assets and goodwill | 4,199 |  |  | 4,666 |
Supplemental Executive Retirement Plans | 2,473 |  |  | 2,427 |
Net operating loss carryforwards | 155 |  |  | 145 |
Postretirement benefits | 505 |  |  | 811 |
Tax credit carryforward | 6,986 |  |  | — |
Nonaccrual interest | 1,300 |  |  | 780 |
Restricted stock and stock option plans | 339 |  |  | 1,153 |
Unrealized loss on investment securities available-for-sale | 6,831 |  |  | 15,629 |
Acquisition fair value adjustments | 98,047 |  |  | 11,531 |
Depreciation | 3,183 |  |  | — |
Loan servicing rights | 2,868 |  |  | — |
Other | 335 |  |  | 166 |
Total gross deferred tax assets, before valuation allowance | 234,637 |  |  | 88,483 |
Valuation allowance | (400) |  |  | — |
Deferred tax assets, net of valuation allowance | 234,237 |  |  | 88,483 |
Deferred tax liabilities: |  |  |
Right-of-use asset - operating leases | 22,592 |  |  | 11,591 |
Identified intangible assets and goodwill | 49,654 |  |  | 6,475 |
Deferred loan origination costs, net | 3,357 |  |  | 3,926 |
Depreciation | — |  |  | 723 |
Prepaid expense | 1,015 |  |  | 377 |
Accrued Expense | 2,048 |  |  | 7,121 |
Investment in partnership | 906 |  |  | 1,646 |
Loan servicing rights | 5,174 |  |  | — |
Other | 4 |  |  | 4 |
Total gross deferred tax liabilities | 84,750 |  |  | 31,863 |
Net deferred tax asset | $ | 149,487 |  |  | $ | 56,620 |
Schedule of Valuation Allowance | The components of the Company’s valuation allowance on its deferred tax asset, net as of December 31, 2025 and 2024 are as follows:
| At December 31,
| 2025 |  | 2024
| (In Thousands)
State valuation allowances | $ | (400) |  |  | $ | — |
Schedule of Unrecognized Tax Benefits | The following table presents changes in unrecognized tax benefits for the years ended December 31, 2025, 2024, and 2023:
| At December 31,
| 2025 |  | 2024 |  | 2023
| (In Thousands)
Balance at January 1 | $ | 643 |  |  | $ | 638 |  |  | $ | 621 |
Acquired unrecognized tax benefits | 11,502 |  |  | — |  |  | — |
Additions based on tax positions related to the current year | — |  |  | — |  |  | — |
Additions for tax positions of prior years | 981 |  |  | 5 |  |  | 34 |
Reductions for tax positions of prior years | (84) |  |  | — |  |  | — |
Reductions due to lapse of statue of limitations | (897) |  |  | — |  |  | (17) |
Settlements | (221) |  |  | — |  |  | — |
Balance at December 31 | $ | 11,924 |  |  | $ | 643 |  |  | $ | 638 |

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