Debt Securities Available for Sale (Tables)
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3 Months Ended |
Mar. 31, 2026 |
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| Investments, Debt and Equity Securities [Abstract] |
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| Schedule of Debt Securities, Available-for-Sale |
Debt securities available for sale at March 31, 2026 and December 31, 2025 are summarized as follows: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | March 31, 2026 | | Amortized Cost | | Gross Unrealized Gains | | Gross Unrealized (Losses) | | | | Fair Value | | (In thousands) | | | | | | | | | | | | U.S. government and agency obligations | $ | 404,409 | | | $ | 2,407 | | | $ | (596) | | | | | $ | 406,220 | | | Mortgage-backed securities and collateralized mortgage obligations | 813,554 | | | 1,012 | | | (80,290) | | | | | 734,276 | | | Municipal obligations | 1,975 | | | — | | | (10) | | | | | 1,965 | | | Corporate debt securities | 61,978 | | | 224 | | | (5,793) | | | | | 56,409 | | | $ | 1,281,916 | | | $ | 3,643 | | | $ | (86,689) | | | | | $ | 1,198,870 | |
| | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2025 | | Amortized Cost | | Gross Unrealized Gains | | Gross Unrealized (Losses) | | Fair Value | | | | (In thousands) | | | | | | | | | | | | U.S. government and agency obligations | $ | 393,875 | | | $ | 4,595 | | | $ | — | | | $ | 398,470 | | | Mortgage-backed securities and collateralized mortgage obligations | 732,393 | | | 1,646 | | | (79,066) | | | 654,973 | | | Municipal obligations | 1,975 | | | — | | | (14) | | | 1,961 | | | Corporate debt securities | 71,976 | | | 314 | | | (5,677) | | | 66,613 | | | | | | | | | | | $ | 1,200,219 | | | $ | 6,555 | | | $ | (84,757) | | | $ | 1,122,017 | |
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| Schedule of Securities by Contractual Maturity |
The amortized cost and fair value of debt securities available for sale at March 31, 2026, by contractual final maturity, is shown below. Expected maturities may differ from contractual maturities due to prepayment or early call options exercised by the issuer.
| | | | | | | | | | | | | March 31, 2026 | | Amortized Cost | | Fair Value | | (In thousands) | | | | | | One year or less | $ | 115,979 | | | $ | 116,240 | | | More than one year to five years | 285,586 | | | 285,453 | | | More than five years to ten years | 66,797 | | | 62,901 | | | | | | | $ | 468,362 | | | $ | 464,594 | | | Mortgage-backed securities and collateralized mortgage obligations | 813,554 | | | 734,276 | | | $ | 1,281,916 | | | $ | 1,198,870 | |
The amortized cost and fair value of debt securities held to maturity at March 31, 2026, by contractual final maturity, is shown below. Expected maturities may differ from contractual maturities due to prepayment or early call options exercised by the issuer. | | | | | | | | | | | | | March 31, 2026 | | Amortized Cost | | Fair Value | | (In thousands) | | | | | | | | | | More than one year to five years | $ | 19,998 | | | $ | 18,633 | | | | | | | More than ten years | 10,000 | | | 7,994 | | | 29,998 | | | 26,627 | | | Mortgage-backed securities and collateralized mortgage obligations | 347,849 | | | 321,346 | | | $ | 377,847 | | | $ | 347,973 | |
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| Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value |
The following tables summarize the fair value and gross unrealized losses of those securities that reported an unrealized loss at March 31, 2026 and December 31, 2025 and if the unrealized loss position was continuous for the twelve months prior to those respective dates: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | March 31, 2026 | | Less Than 12 Months | | 12 Months or Longer | | Total | | Fair Value | | Gross Unrealized (Losses) | | Fair Value | | Gross Unrealized (Losses) | | Fair Value | | Gross Unrealized (Losses) | | (In thousands) | | | | | | | | | | | | | | U.S. government and agency obligations | $ | 112,971 | | | $ | (596) | | | $ | — | | | $ | — | | | $ | 112,971 | | | $ | (596) | | | Mortgage-backed securities and collateralized mortgage obligations | 111,937 | | | (768) | | | 441,373 | | | (79,522) | | | 553,310 | | | (80,290) | | | Municipal obligations | 1,540 | | | (10) | | | — | | | — | | | 1,540 | | | (10) | | | Corporate debt securities | 3,852 | | | (148) | | | 46,833 | | | (5,645) | | | 50,685 | | | (5,793) | | | | | | | | | | | | | | | $ | 230,300 | | | $ | (1,522) | | | $ | 488,206 | | | $ | (85,167) | | | $ | 718,506 | | | $ | (86,689) | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2025 | | Less Than 12 Months | | 12 Months or Longer | | Total | | Fair Value | | Gross Unrealized (Losses) | | Fair Value | | Gross Unrealized (Losses) | | Fair Value | | Gross Unrealized (Losses) | | (In thousands) | | | | | | | | | | | | | | U.S. government and agency obligations | $ | — | | | $ | — | | | $ | — | | | $ | — | | | $ | — | | | $ | — | | | Mortgage-backed securities and collateralized mortgage obligations | 27,710 | | | (57) | | | 456,562 | | | (79,009) | | | 484,272 | | | (79,066) | | | Municipal obligations | 1,536 | | | (14) | | | — | | | — | | | 1,536 | | | (14) | | | Corporate debt securities | 3,996 | | | (4) | | | 56,802 | | | (5,673) | | | 60,798 | | | (5,677) | | | | | | | | | | | | | | | $ | 33,242 | | | $ | (75) | | | $ | 513,364 | | | $ | (84,682) | | | $ | 546,606 | | | $ | (84,757) | |
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