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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Summary of Investment Securities | The following table summarizes the amortized cost and fair value of available-for-sale securities by major type:
| At December 31, 2024
(In thousands) | Amortized Cost (1) | Unrealized Gains | Unrealized Losses | Allowance for Credit Losses | Fair Value
Government agency debentures | $ | 222,767 |  | $ | — |  | $ | (36,341) |  | $ | — |  | $ | 186,426 |
Municipal bonds and notes | 123,885 |  | 2 |  | (13,011) |  | — |  | 110,876 |
Agency CMO | 32,193 |  | — |  | (3,150) |  | — |  | 29,043 |
Agency MBS | 4,760,541 |  | 11,654 |  | (252,410) |  | — |  | 4,519,785 |
Agency CMBS | 3,400,021 |  | 84 |  | (365,713) |  | — |  | 3,034,392 |
CMBS | 630,985 |  | 411 |  | (6,008) |  | — |  | 625,388 |
Corporate debt | 496,087 |  | 801 |  | (43,755) |  | (867) |  | 452,266 |
Private label MBS | 44,081 |  | — |  | (4,862) |  | — |  | 39,219 |
Other | 9,855 |  | — |  | (650) |  | — |  | 9,205 |
Total available-for-sale | $ | 9,720,415 |  | $ | 12,952 |  | $ | (725,900) |  | $ | (867) |  | $ | 9,006,600 |
| At December 31, 2023
(In thousands) | Amortized Cost (1) | Unrealized Gains | Unrealized Losses | Allowance for Credit Losses | Fair Value
Government agency debentures | $ | 302,212 |  | $ | — |  | $ | (37,579) |  | $ | — |  | $ | 264,633 |
Municipal bonds and notes | 1,626,126 |  | 8 |  | (52,901) |  | — |  | 1,573,233 |
Agency CMO | 52,994 |  | — |  | (4,053) |  | — |  | 48,941 |
Agency MBS | 3,568,140 |  | 32,461 |  | (253,503) |  | — |  | 3,347,098 |
Agency CMBS | 2,569,438 |  | 18,204 |  | (299,571) |  | — |  | 2,288,071 |
CMBS | 788,478 |  | — |  | (24,729) |  | — |  | 763,749 |
Corporate debt | 704,569 |  | — |  | (82,414) |  | — |  | 622,155 |
Private label MBS | 46,635 |  | — |  | (3,827) |  | — |  | 42,808 |
Other | 9,830 |  | — |  | (789) |  | — |  | 9,041 |
Total available-for-sale | $ | 9,668,422 |  | $ | 50,673 |  | $ | (759,366) |  | $ | — |  | $ | 8,959,729 |
(1)Accrued interest receivable on available-for-sale securities of $35.2 million and $42.5 million at December 31, 2024, and 2023, respectively, is excluded from amortized cost and is included in Accrued interest receivable and other assets on the accompanying Consolidated Balance Sheets.
Summary of Gross Unrealized Losses and Fair Value of Available-for-Sale Securities | The following tables summarize the gross unrealized losses and fair value of available-for-sale securities by length of time each major security type has been in a continuous unrealized loss position:
| At December 31, 2024
| Less Than 12 Months |  | 12 Months or More |  | Total
(Dollars in thousands) | Fair Value | Unrealized Losses |  | Fair Value | Unrealized Losses |  | Number of Holdings | Fair Value | Unrealized Losses
Government agency debentures | $ | — |  | $ | — |  |  | $ | 186,427 |  | $ | (36,341) |  |  | 15 | $ | 186,427 |  | $ | (36,341) |
Municipal bonds and notes | 859 |  | (1) |  |  | 108,013 |  | (13,010) |  |  | 57 | 108,872 |  | (13,011) |
Agency CMO | — |  | — |  |  | 29,043 |  | (3,150) |  |  | 28 | 29,043 |  | (3,150) |
Agency MBS | 2,624,722 |  | (31,539) |  |  | 1,246,818 |  | (220,871) |  |  | 370 | 3,871,540 |  | (252,410) |
Agency CMBS | 1,468,615 |  | (32,528) |  |  | 1,540,263 |  | (333,185) |  |  | 185 | 3,008,878 |  | (365,713) |
CMBS | — |  | — |  |  | 457,423 |  | (6,008) |  |  | 32 | 457,423 |  | (6,008) |
Corporate debt | — |  | — |  |  | 426,805 |  | (43,755) |  |  | 59 | 426,805 |  | (43,755) |
Private label MBS | — |  | — |  |  | 39,219 |  | (4,862) |  |  | 3 | 39,219 |  | (4,862) |
Other | — |  | — |  |  | 9,205 |  | (650) |  |  | 2 | 9,205 |  | (650) |
Total | $ | 4,094,196 |  | $ | (64,068) |  |  | $ | 4,043,216 |  | $ | (661,832) |  |  | 751 | $ | 8,137,412 |  | $ | (725,900) |
| At December 31, 2023
| Less Than 12 Months |  | 12 Months or More |  | Total
(Dollars in thousands) | Fair Value | Unrealized Losses |  | Fair Value | Unrealized Losses |  | Number of Holdings | Fair Value | Unrealized Losses
Government agency debentures | $ | — |  | $ | — |  |  | $ | 264,633 |  | $ | (37,579) |  |  | 19 | $ | 264,633 |  | $ | (37,579) |
Municipal bonds and notes | 18,066 |  | (124) |  |  | 1,536,656 |  | (52,777) |  |  | 386 | 1,554,722 |  | (52,901) |
Agency CMO | — |  | — |  |  | 48,941 |  | (4,053) |  |  | 36 | 48,941 |  | (4,053) |
Agency MBS | 71,187 |  | (272) |  |  | 1,945,221 |  | (253,231) |  |  | 457 | 2,016,408 |  | (253,503) |
Agency CMBS | 430,070 |  | (16,137) |  |  | 1,314,681 |  | (283,434) |  |  | 145 | 1,744,751 |  | (299,571) |
CMBS | 43,844 |  | (856) |  |  | 719,905 |  | (23,873) |  |  | 42 | 763,749 |  | (24,729) |
Corporate debt | 4,278 |  | (27) |  |  | 617,877 |  | (82,387) |  |  | 91 | 622,155 |  | (82,414) |
Private label MBS | — |  | — |  |  | 42,808 |  | (3,827) |  |  | 3 | 42,808 |  | (3,827) |
Other | — |  | — |  |  | 9,041 |  | (789) |  |  | 2 | 9,041 |  | (789) |
Total | $ | 567,445 |  | $ | (17,416) |  |  | $ | 6,499,763 |  | $ | (741,950) |  |  | 1,181 | $ | 7,067,208 |  | $ | (759,366) |
Summary of Debt Securities by Contractual Maturity | The following table summarizes the amortized cost and fair value of available-for-sale securities by contractual maturity:
| At December 31, 2024
(In thousands) | Amortized Cost |  | Fair Value
Maturing within 1 year | $ | 6,343 |  |  | $ | 6,322 |
After 1 year through 5 years | 248,409 |  |  | 243,204 |
After 5 years through 10 years | 626,884 |  |  | 576,872 |
After 10 years | 8,838,779 |  |  | 8,180,202 |
Total available-for-sale | $ | 9,720,415 |  |  | $ | 9,006,600 |
The following table summarizes the amortized cost and fair value of held-to-maturity securities by contractual maturity:
| At December 31, 2024
(In thousands) | Amortized Cost |  | Fair Value
Maturing within 1 year | $ | 49,231 |  |  | $ | 49,217 |
After 1 year through 5 years | 158,778 |  |  | 149,418 |
After 5 years through 10 years | 241,456 |  |  | 233,792 |
After 10 years | 7,994,897 |  |  | 7,020,696 |
Total held-to-maturity | $ | 8,444,362 |  |  | $ | 7,453,123 |
Schedule of Realized Gain (Loss) | The following table summarizes information related to sales of available-for-sales securities:
| Years ended December 31,
(In thousands) | 2024 |  | 2023 |  | 2022
Proceeds from sales | $ | 2,142,462 |  |  | $ | 789,603 |  |  | $ | 172,947 |
Gross realized gains | $ | 2,240 |  |  | $ | — |  |  | $ | — |
Gross realized losses (1) | (141,034) |  |  | (37,356) |  |  | (6,751) |
(1)For the years ended December 31, 2024, and 2023, respectively, $2.6 million and $3.8 million of the gross losses realized on sale of available-for-sale securities were due to credit related factors. Accordingly, these amounts have been included in the Provision for credit losses on the accompanying Consolidated Statements of Income. The $136.2 million and $33.6 million included in non-interest income for the years ended December 31, 2024, and 2023, respectively, reflected the loss amounts, net of any gross realized gains, that were not due to credit related factors. There were no gross losses realized on sale of available-for-sale securities due to credit related factors for the year ended December 31, 2022.
Summary of Carrying Value of Available-for-Sale Securities | The following table summarizes the carrying value of available-for-sale securities pledged for deposits, borrowings, and other purposes:
| At December 31,
(In thousands) | 2024 |  | 2023
Pledged for deposits | $ | 1,596,378 |  | $ | 2,102,115
Pledged for borrowings and other | 6,863,183 |  | 6,111,430
Total available-for-sale securities pledged | $ | 8,459,561 |  | $ | 8,213,545
Summary of Debt Securities Held-to-Maturity | The following table summarizes the amortized cost, fair value, and ACL on held-to-maturity securities by major type:
| At December 31, 2024
(In thousands) | Amortized Cost (1) | Unrealized Gains | Unrealized Losses | Fair Value |  | Allowance for Credit Losses | Net Carrying Value
Agency CMO | $ | 19,847 |  | $ | — |  | $ | (1,671) |  | $ | 18,176 |  |  | $ | — |  | $ | 19,847 |
Agency MBS | 3,109,411 |  | 771 |  | (333,039) |  | 2,777,143 |  |  | — |  | 3,109,411 |
Agency CMBS | 4,357,505 |  | 414 |  | (613,914) |  | 3,744,005 |  |  | — |  | 4,357,505 |
Municipal bonds and notes | 891,909 |  | 317 |  | (40,266) |  | 851,960 |  |  | 171 |  | 891,738 |
CMBS | 65,690 |  | — |  | (3,851) |  | 61,839 |  |  | — |  | 65,690 |
Total held-to-maturity | $ | 8,444,362 |  | $ | 1,502 |  | $ | (992,741) |  | $ | 7,453,123 |  |  | $ | 171 |  | $ | 8,444,191 |
| At December 31, 2023
(In thousands) | Amortized Cost (1) | Unrealized Gains | Unrealized Losses | Fair Value |  | Allowance for Credit Losses | Net Carrying Value
Agency CMO | $ | 23,470 |  | $ | — |  | $ | (1,728) |  | $ | 21,742 |  |  | $ | — |  | $ | 23,470 |
Agency MBS | 2,409,521 |  | 1,141 |  | (284,776) |  | 2,125,886 |  |  | — |  | 2,409,521 |
Agency CMBS | 3,625,627 |  | 18,586 |  | (514,534) |  | 3,129,679 |  |  | — |  | 3,625,627 |
Municipal bonds and notes | 916,104 |  | 2,440 |  | (24,877) |  | 893,667 |  |  | 209 |  | 915,895 |
CMBS | 100,075 |  | — |  | (6,426) |  | 93,649 |  |  | — |  | 100,075 |
Total held-to-maturity | $ | 7,074,797 |  | $ | 22,167 |  | $ | (832,341) |  | $ | 6,264,623 |  |  | $ | 209 |  | $ | 7,074,588 |
(1)Accrued interest receivable on held-to-maturity securities of $30.5 million and $24.9 million at December 31, 2024, and 2023, respectively, is excluded from amortized cost and is included in Accrued interest receivable and other assets on the accompanying Consolidated Balance Sheets. The following table summarizes the carrying value of held-to-maturity securities pledged for deposits, borrowings, and other purposes:
| At December 31,
(In thousands) | 2024 |  | 2023
Pledged for deposits | $ | 1,978,445 |  | $ | 1,212,824
Pledged for borrowings and other | 6,258,828 |  | 5,582,379
Total held-to-maturity securities pledged | $ | 8,237,273 |  | $ | 6,795,203
Summary of Activity in the ACL on Held-to-Maturity Securities | The following table summarizes the activity in the ACL on held-to-maturity securities:
| Years ended December 31,
(In thousands) | 2024 |  | 2023 |  | 2022
Balance, beginning of period | $ | 209 |  | $ | 182 |  | $ | 214
(Benefit) provision for credit losses | (38) |  | 27 |  | (32)
Balance, end of period | $ | 171 |  | $ | 209 |  | $ | 182
Summary of Amortized Cost of Held-to-Maturity Securities | The following tables summarize the amortized cost of held-to-maturity securities based on their lowest publicly available credit rating:
| At December 31, 2024
| Investment Grade |  |
(In thousands) | Aaa | Aa1 | Aa2 | Aa3 | A1 |  | A3 |  |  | Not Rated
Agency CMOs | $ | — |  | $ | 19,847 |  | $ | — |  | $ | — |  | $ | — |  |  | $ | — |  |  |  | $ | — |
Agency MBS | — |  | 3,109,411 |  | — |  | — |  | — |  |  | — |  |  |  | — |
Agency CMBS | — |  | 4,357,505 |  | — |  | — |  | — |  |  | — |  |  |  | — |
Municipal bonds and notes | 341,187 |  | 158,327 |  | 230,986 |  | 128,692 |  | 13,761 |  |  | 4,165 |  |  |  | 14,791 |
CMBS | 65,690 |  | — |  | — |  | — |  | — |  |  | — |  |  |  | — |
Total held-to-maturity | $ | 406,877 |  | $ | 7,645,090 |  | $ | 230,986 |  | $ | 128,692 |  | $ | 13,761 |  |  | $ | 4,165 |  |  |  | $ | 14,791 |
| At December 31, 2023
| Investment Grade |  |
(In thousands) | Aaa | Aa1 | Aa2 | Aa3 | A1 |  | A3 |  |  | Not Rated
Agency CMOs | $ | — |  | $ | 23,470 |  | $ | — |  | $ | — |  | $ | — |  |  | $ | — |  |  |  | $ | — |
Agency MBS | — |  | 2,409,521 |  | — |  | — |  | — |  |  | — |  |  |  | — |
Agency CMBS | — |  | 3,625,627 |  | — |  | — |  | — |  |  | — |  |  |  | — |
Municipal bonds and notes | 333,479 |  | 162,615 |  | 253,671 |  | 115,404 |  | 32,732 |  |  | 4,165 |  |  |  | 14,038 |
CMBS | 100,075 |  | — |  | — |  | — |  | — |  |  | — |  |  |  | — |
Total held-to-maturity | $ | 433,554 |  | $ | 6,221,233 |  | $ | 253,671 |  | $ | 115,404 |  | $ | 32,732 |  |  | $ | 4,165 |  |  |  | $ | 14,038 |

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