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Securities (Tables) | 12 Months Ended
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Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Summary of Amortized Cost and Fair Value of Securities Available for Sale | The amortized cost, gross unrealized gains and losses and fair value of AFS and HTM securities at December 31, 2024 and December 31, 2023 are summarized as follows:
|  | December 31, 2024
(In thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-Sale Debt Securities |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government agencies |  | $ | 28,233 |  |  | $ | 29 |  |  | $ | (522) |  |  | $ | 27,740 |
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | 1,777,274 |  |  | 1,237 |  |  | (190,536) |  |  | 1,587,975 |
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | 206,537 |  |  | 1,195 |  |  | (10,283) |  |  | 197,449 |
Private mortgage-backed securities and collateralized mortgage obligations |  | 129,475 |  |  | 149 |  |  | (8,382) |  |  | 121,242 |
Collateralized loan obligations |  | 278,342 |  |  | 788 |  |  | (166) |  |  | 278,964 |
Obligations of state and political subdivisions |  | 7,139 |  |  | — |  |  | (1,449) |  |  | 5,690 |
Other Debt Securities |  | 7,389 |  |  | 94 |  |  | — |  |  | 7,483 |
Totals |  | $ | 2,434,389 |  |  | $ | 3,492 |  |  | $ | (211,338) |  |  | $ | 2,226,543 |
Held-to-Maturity Debt Securities |  |  |  |  |  |  |  |
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | $ | 546,444 |  |  | $ | — |  |  | $ | (117,620) |  |  | $ | 428,824 |
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | 88,742 |  |  | — |  |  | (9,972) |  |  | 78,770 |
Totals |  | $ | 635,186 |  |  | $ | — |  |  | $ | (127,592) |  |  | $ | 507,594 |
|  | December 31, 2023
(In thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-Sale Debt Securities |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government agencies |  | $ | 37,718 |  |  | $ | 205 |  |  | $ | (478) |  |  | $ | 37,445 |
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | 1,152,753 |  |  | 780 |  |  | (184,152) |  |  | 969,381 |
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | 385,013 |  |  | 2,824 |  |  | (19,565) |  |  | 368,272 |
Private mortgage-backed securities and collateralized mortgage obligations |  | 135,878 |  |  | 36 |  |  | (10,911) |  |  | 125,003 |
Collateralized loan obligations |  | 300,855 |  |  | 11 |  |  | (1,411) |  |  | 299,455 |
Obligations of state and political subdivisions |  | 10,486 |  |  | — |  |  | (1,096) |  |  | 9,390 |
Other debt securities |  | 26,599 |  |  | 576 |  |  | (101) |  |  | 27,074 |
Totals |  | $ | 2,049,302 |  |  | $ | 4,432 |  |  | $ | (217,714) |  |  | $ | 1,836,020 |
Held-to-Maturity Debt Securities |  |  |  |  |  |  |  |
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | $ | 590,676 |  |  | $ | — |  |  | $ | (111,746) |  |  | $ | 478,930 |
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | 89,637 |  |  | — |  |  | (10,208) |  |  | 79,429 |
Totals |  | $ | 680,313 |  |  | $ | — |  |  | $ | (121,954) |  |  | $ | 558,359 |
Summary of Amortized Cost and Fair Value of Securities Held to Maturity | The amortized cost, gross unrealized gains and losses and fair value of AFS and HTM securities at December 31, 2024 and December 31, 2023 are summarized as follows:
|  | December 31, 2024
(In thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-Sale Debt Securities |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government agencies |  | $ | 28,233 |  |  | $ | 29 |  |  | $ | (522) |  |  | $ | 27,740 |
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | 1,777,274 |  |  | 1,237 |  |  | (190,536) |  |  | 1,587,975 |
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | 206,537 |  |  | 1,195 |  |  | (10,283) |  |  | 197,449 |
Private mortgage-backed securities and collateralized mortgage obligations |  | 129,475 |  |  | 149 |  |  | (8,382) |  |  | 121,242 |
Collateralized loan obligations |  | 278,342 |  |  | 788 |  |  | (166) |  |  | 278,964 |
Obligations of state and political subdivisions |  | 7,139 |  |  | — |  |  | (1,449) |  |  | 5,690 |
Other Debt Securities |  | 7,389 |  |  | 94 |  |  | — |  |  | 7,483 |
Totals |  | $ | 2,434,389 |  |  | $ | 3,492 |  |  | $ | (211,338) |  |  | $ | 2,226,543 |
Held-to-Maturity Debt Securities |  |  |  |  |  |  |  |
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | $ | 546,444 |  |  | $ | — |  |  | $ | (117,620) |  |  | $ | 428,824 |
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | 88,742 |  |  | — |  |  | (9,972) |  |  | 78,770 |
Totals |  | $ | 635,186 |  |  | $ | — |  |  | $ | (127,592) |  |  | $ | 507,594 |
|  | December 31, 2023
(In thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-Sale Debt Securities |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government agencies |  | $ | 37,718 |  |  | $ | 205 |  |  | $ | (478) |  |  | $ | 37,445 |
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | 1,152,753 |  |  | 780 |  |  | (184,152) |  |  | 969,381 |
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | 385,013 |  |  | 2,824 |  |  | (19,565) |  |  | 368,272 |
Private mortgage-backed securities and collateralized mortgage obligations |  | 135,878 |  |  | 36 |  |  | (10,911) |  |  | 125,003 |
Collateralized loan obligations |  | 300,855 |  |  | 11 |  |  | (1,411) |  |  | 299,455 |
Obligations of state and political subdivisions |  | 10,486 |  |  | — |  |  | (1,096) |  |  | 9,390 |
Other debt securities |  | 26,599 |  |  | 576 |  |  | (101) |  |  | 27,074 |
Totals |  | $ | 2,049,302 |  |  | $ | 4,432 |  |  | $ | (217,714) |  |  | $ | 1,836,020 |
Held-to-Maturity Debt Securities |  |  |  |  |  |  |  |
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | $ | 590,676 |  |  | $ | — |  |  | $ | (111,746) |  |  | $ | 478,930 |
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | 89,637 |  |  | — |  |  | (10,208) |  |  | 79,429 |
Totals |  | $ | 680,313 |  |  | $ | — |  |  | $ | (121,954) |  |  | $ | 558,359 |
Summary of Investments Classified by Contractual Maturity | Securities not due at a single maturity date are shown separately.
|  | Held-to-Maturity |  | Available-for-Sale
(In thousands) |  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due in less than one year |  | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | 1 |
Due after one year through five years |  | — |  |  | — |  |  | 6,288 |  |  | 6,283 |
Due after five years through ten years |  | — |  |  | — |  |  | 7,306 |  |  | 7,226 |
Due after ten years |  | — |  |  | — |  |  | 21,777 |  |  | 19,920 |
|  | $ | — |  |  | $ | — |  |  | $ | 35,372 |  |  | $ | 33,430 |
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | $ | 546,444 |  |  | $ | 428,824 |  |  | $ | 1,777,274 |  |  | $ | 1,587,975 |
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | 88,742 |  |  | 78,770 |  |  | 206,537 |  |  | 197,449 |
Private mortgage-backed securities and collateralized mortgage obligations |  | — |  |  | — |  |  | 129,475 |  |  | 121,242 |
Collateralized loan obligations |  | — |  |  | — |  |  | 278,342 |  |  | 278,964 |
Other debt securities |  | — |  |  | — |  |  | 7,389 |  |  | 7,483 |
Totals |  | $ | 635,186 |  |  | $ | 507,594 |  |  | $ | 2,434,389 |  |  | $ | 2,226,543 |
Schedule of Unrealized Loss and Fair Value on Investments | The tables below indicate the fair value of AFS debt securities with unrealized losses for which no allowance for credit losses has been recorded.
|  | December 31, 2024
|  | Less than 12 months |  | 12 months or longer |  | Total 1
(In thousands) |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
U.S. Treasury securities and obligations of U.S. government agencies |  | $ | 4,825 |  |  | $ | (13) |  |  | $ | 18,060 |  |  | $ | (509) |  |  | $ | 22,885 |  |  | $ | (522) |
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | 648,967 |  |  | (7,578) |  |  | 739,363 |  |  | (182,958) |  |  | 1,388,330 |  |  | (190,536) |
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | 13,200 |  |  | (222) |  |  | 107,041 |  |  | (10,061) |  |  | 120,241 |  |  | (10,283) |
Private mortgage-backed securities and collateralized mortgage obligations |  | 7,178 |  |  | (16) |  |  | 101,242 |  |  | (8,366) |  |  | 108,420 |  |  | (8,382) |
Collateralized loan obligations |  | 43,410 |  |  | (152) |  |  | 7,596 |  |  | (14) |  |  | 51,006 |  |  | (166) |
Obligations of state and political subdivisions |  | 319 |  |  | (15) |  |  | 5,371 |  |  | (1,434) |  |  | 5,690 |  |  | (1,449) |
Totals |  | $ | 717,899 |  |  | $ | (7,996) |  |  | $ | 978,673 |  |  | $ | (203,342) |  |  | $ | 1,696,572 |  |  | $ | (211,338) |
1 Comprised of 377 individual securities
|  | December 31, 2023
|  | Less than 12 months |  | 12 months or longer |  | Total 1
(In thousands) |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
U.S. Treasury securities and obligations of U.S. government agencies |  | $ | 24,933 |  |  | $ | (143) |  |  | $ | 3,594 |  |  | $ | (335) |  |  | $ | 28,527 |  |  | $ | (478) |
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | 91,867 |  |  | (9,320) |  |  | 826,324 |  |  | (174,832) |  |  | 918,191 |  |  | (184,152) |
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  | 24,251 |  |  | (1,270) |  |  | 262,666 |  |  | (18,295) |  |  | 286,917 |  |  | (19,565) |
Private mortgage-backed securities and collateralized mortgage obligations |  | 3,945 |  |  | (69) |  |  | 119,475 |  |  | (10,842) |  |  | 123,420 |  |  | (10,911) |
Collateralized loan obligations |  | 60,087 |  |  | (223) |  |  | 232,545 |  |  | (1,188) |  |  | 292,632 |  |  | (1,411) |
Obligations of state and political subdivisions |  | 326 |  |  | (2) |  |  | 9,064 |  |  | (1,094) |  |  | 9,390 |  |  | (1,096) |
Other debt securities |  | 10,579 |  |  | (101) |  |  | — |  |  | — |  |  | 10,579 |  |  | (101) |
Totals |  | $ | 215,988 |  |  | $ | (11,128) |  |  | $ | 1,453,668 |  |  | $ | (206,586) |  |  | $ | 1,669,656 |  |  | $ | (217,714) |
1 Comprised of 504 individual securities

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