Fair Value of Assets and Liabilities (Tables)
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6 Months Ended |
Jun. 30, 2026 |
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| Fair Value Disclosures [Abstract] |
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| Schedule of The Balances Of Assets And Liabilities Measured At Fair Value On A Recurring Basis |
The following tables present the balances of assets and liabilities measured at fair value on a recurring basis as of June 30, 2026 and December 31, 2025: | | | | | | | | | | | | | | | | | | | | | | | | | | | Fair Value Measurements at Reporting Date Using | | Balance as of June 30, 2026 | | Quoted Prices in
Active Markets
for Identical
Assets (Level 1) | | Significant
Other
Observable
Inputs (Level 2) | | Significant
Unobservable
Inputs (Level 3) | | Description | | | | | (In thousands) | | Assets | | | | | | | | | Securities available for sale: | | | | | | | | | Government-sponsored residential mortgage-backed securities | $ | 2,794,837 | | | $ | — | | | $ | 2,794,837 | | | $ | — | | | Government-sponsored commercial mortgage-backed securities | 1,024,510 | | | — | | | 1,024,510 | | | — | | | U.S. Treasury securities | 50,066 | | | 50,066 | | | — | | | — | | | State and municipal bonds and obligations | 178,415 | | | — | | | 178,415 | | | — | | | Investments for employee retirement benefits | 110,648 | | | 95,488 | | | 15,160 | | | — | | | Deferred compensation investments | 2,354 | | 2,354 | | — | | — | | Loans held for sale | 42,649 | | — | | 42,649 | | — | | Mortgage servicing rights | 39,642 | | — | | — | | 39,642 | | Interest rate swap contracts: | | | | | | | | | Cash flow hedges - interest rate positions | 1 | | | — | | | 1 | | | — | | | Customer-related positions | 50,426 | | | — | | | 50,426 | | | — | | | Risk participation agreements | 8 | | | — | | | 8 | | | — | | | Foreign currency forward contracts: | | | | | | | | | Matched customer book | 1,358 | | | — | | | 1,358 | | | — | | | Foreign currency loan | 13 | | | — | | | 13 | | | — | | | Mortgage derivatives | 401 | | | — | | | 401 | | | — | | | Total | $ | 4,295,328 | | | $ | 147,908 | | | $ | 4,107,778 | | | $ | 39,642 | | | Liabilities | | | | | | | | | Interest rate swap contracts: | | | | | | | | | Cash flow hedges - interest rate positions | 55 | | | — | | | 55 | | | — | | | Customer-related positions | 74,125 | | | — | | | 74,125 | | | — | | | Risk participation agreements | 6 | | | — | | 6 | | | — | | Foreign currency forward contracts: | | | | | | | | | Matched customer book | 1,318 | | | — | | 1,318 | | | — | | Foreign currency loan | 8 | | | — | | 8 | | | — | | Mortgage derivatives | 66 | | | — | | | 66 | | | — | | | Total | $ | 75,578 | | | $ | — | | | $ | 75,578 | | | $ | — | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | Fair Value Measurements at Reporting Date Using | | Description | Balance as of December 31, 2025 | | Quoted Prices in
Active Markets
for Identical
Assets (Level 1) | | Significant
Other
Observable
Inputs (Level 2) | | Significant
Unobservable
Inputs (Level 3) | | (In thousands) | | Assets | | | | | | | | | Securities available for sale: | | | | | | | | | Government-sponsored residential mortgage-backed securities | $ | 2,533,309 | | | $ | — | | | $ | 2,533,309 | | | $ | — | | | Government-sponsored commercial mortgage-backed securities | 1,060,331 | | | — | | | 1,060,331 | | | — | | | U.S. Treasury securities | 50,350 | | | 50,350 | | | — | | | — | | | State and municipal bonds and obligations | 181,579 | | | — | | | 181,579 | | | — | | | Investments for employee retirement benefits | 106,534 | | | 94,736 | | | 11,798 | | | — | | | Deferred compensation plan investments | 2,384 | | | 2,384 | | | — | | | — | | | Loans held for sale | 22,761 | | — | | 22,761 | | — | | Mortgage servicing rights | 40,709 | | — | | — | | 40,709 | | Interest rate swap contracts: | | | | | | | | | Cash flow hedges - interest rate positions | 30 | | | — | | | 30 | | | — | | | Customer-related positions | 54,561 | | | — | | | 54,561 | | | — | | | Risk participation agreements | 10 | | | — | | | 10 | | | — | | | Foreign currency forward contracts: | | | | | | | | | Matched customer book | 434 | | | — | | | 434 | | | — | | | Foreign currency loan | 13 | | | — | | | 13 | | | — | | | Mortgage derivatives | 458 | | | — | | | 458 | | | — | | | Total | $ | 4,053,463 | | | $ | 147,470 | | | $ | 3,865,284 | | | $ | 40,709 | | | Liabilities | | | | | | | | | Interest rate swap contracts: | | | | | | | | | Cash flow hedges - interest rate positions | $ | 24 | | | $ | — | | | $ | 24 | | | $ | — | | | Customer-related positions | 74,358 | | | — | | | 74,358 | | | — | | | Risk participation agreements | 7 | | | — | | | 7 | | | — | | | Foreign currency forward contracts: | | | | | | | | | Matched customer book | 330 | | | — | | | 330 | | | — | | | Mortgage derivatives | 100 | | | — | | | 100 | | | — | | | Total | $ | 74,819 | | | $ | — | | | $ | 74,819 | | | $ | — | |
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| Schedule of The Fair Value Of Assets And Liabilities Measured At Fair Value On A Nonrecurring Basis |
The following tables summarize the fair value of assets and liabilities measured at fair value on a nonrecurring basis, as of June 30, 2026 and December 31, 2025. | | | | | | | | | | | | | | | | | | | | | | | | | | | Fair Value Measurements at Reporting Date Using | | Description | Balance as of June 30, 2026 | | Quoted Prices
in Active
Markets for
Identical Assets
(Level 1) | | Significant
Other
Observable
Inputs (Level 2) | | Significant
Unobservable
Inputs (Level 3) | | (In thousands) | | Assets | | | | | | | | | Individually assessed collateral-dependent loans whose fair value is based upon appraisals | $ | 50,606 | | | $ | — | | | $ | — | | | $ | 50,606 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | Fair Value Measurements at Reporting Date Using | | Description | Balance as of December 31, 2025 | | Quoted Prices
in Active
Markets for
Identical Assets
(Level 1) | | Significant
Other
Observable
Inputs (Level 2) | | Significant
Unobservable
Inputs (Level 3) | | (In thousands) | | Assets | | | | | | | | | Individually assessed collateral-dependent loans whose fair value is based upon appraisals | $ | 96,022 | | | $ | — | | | $ | — | | | $ | 96,022 | |
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| Schedule of Fair Value, by Balance Sheet Grouping |
The estimated fair values and related carrying amounts for assets and liabilities for which fair value is only disclosed are shown below as of the dates indicated: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fair Value Measurements at Reporting Date Using | | Description | Carrying Value as of June 30, 2026 | | Fair Value as of June 30, 2026 | | Quoted Prices
in Active
Markets for
Identical Assets
(Level 1) | | Significant
Other
Observable
Inputs (Level 2) | | Significant
Unobservable
Inputs (Level 3) | | (In thousands) | | Assets | | | | | | | | | | | Held to maturity securities: | | | | | | | | | | | Government-sponsored residential mortgage-backed securities | $ | 199,766 | | | $ | 182,400 | | | $ | — | | | $ | 182,400 | | | $ | — | | | Government-sponsored commercial mortgage-backed securities | 181,682 | | | 169,059 | | | — | | | 169,059 | | | — | | | State and municipal bonds and obligations | 329,860 | | | 335,230 | | | — | | | 335,230 | | | — | | | Corporate bonds | 52,886 | | | 54,302 | | | — | | | 54,302 | | | — | | | Loans, net of allowance for loan losses | 22,956,047 | | | 22,668,384 | | | — | | | — | | | 22,668,384 | | | FHLB stock | 21,250 | | | 21,250 | | | — | | | 21,250 | | | — | | | Bank-owned life insurance | 311,387 | | | 311,387 | | | — | | | 311,387 | | | — | | | Liabilities | | | | | | | | | | | Deposits | $ | 25,919,312 | | | $ | 25,916,198 | | | $ | — | | | $ | 25,916,198 | | | $ | — | | | FHLB advances | 364,412 | | | 361,145 | | | — | | | 361,145 | | | — | | | Interest rate swap collateral funds | 34,181 | | | 34,181 | | | — | | | 34,181 | | | — | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fair Value Measurements at Reporting Date Using | | Description | Carrying Value as of December 31, 2025 | | Fair Value as of December 31, 2025 | | Quoted Prices
in Active
Markets for
Identical Assets
(Level 1) | | Significant
Other
Observable
Inputs (Level 2) | | Significant
Unobservable
Inputs (Level 3) | | (In thousands) | | Assets | | | | | | | | | | | Held to maturity securities: | | | | | | | | | | | Government-sponsored residential mortgage-backed securities | $ | 210,142 | | | $ | 194,547 | | | $ | — | | | $ | 194,547 | | | $ | — | | | Government-sponsored commercial mortgage-backed securities | 185,185 | | | 173,584 | | | — | | | 173,584 | | | — | | | State and municipal bonds and obligations | 167,346 | | | 169,861 | | | — | | | 169,861 | | | — | | | Corporate bonds | 36,884 | | | 37,982 | | | — | | | 37,982 | | | — | | | Loans, net of allowance for loan losses | 22,753,224 | | | 22,365,428 | | | — | | | — | | | 22,365,428 | | | FHLB stock | 13,838 | | | 13,838 | | | — | | | 13,838 | | | — | | | Bank-owned life insurance | 307,836 | | | 307,836 | | | — | | | 307,836 | | | — | | | Liabilities | | | | | | | | | | | Deposits | $ | 25,470,751 | | | $ | 25,469,630 | | | $ | — | | | $ | 25,469,630 | | | $ | — | | | FHLB advances | 199,617 | | | 196,450 | | | — | | | 196,450 | | | — | | | Interest rate swap collateral funds | 15,321 | | | 15,321 | | | — | | | 15,321 | | | — | |
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