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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Schedule of Securities Available-for-Sale Securities | The following tables set forth investment securities available-for-sale at the dates indicated:
| At September 30, 2025
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
| (In Thousands)
Investment securities available-for-sale: |  |  |  |  |  |  |
GSE debentures | $ | 341,753 |  |  | $ | 485 |  |  | $ | 13,887 |  |  | $ | 328,351 |
GSE CMOs | 343,654 |  |  | 2,703 |  |  | 6,656 |  |  | 339,701 |
GSE MBSs | 343,731 |  |  | 1,307 |  |  | 12,644 |  |  | 332,394 |
Municipal obligations | 230,685 |  |  | 4,951 |  |  | 202 |  |  | 235,434 |
Corporate debt obligations | 48,178 |  |  | 413 |  |  | 336 |  |  | 48,255 |
U.S. Treasury bonds | 468,718 |  |  | 1,584 |  |  | 15,514 |  |  | 454,788 |
Foreign government obligations | 500 |  |  | — |  |  | — |  |  | 500 |
Total investment securities available-for-sale | 1,777,219 |  |  | 11,443 |  |  | $ | 49,239 |  |  | 1,739,423 |
| December 31, 2024
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
| (In Thousands)
Investment securities available-for-sale: |  |  |  |  |  |  |
GSE debentures | $ | 195,099 |  |  | $ | 225 |  |  | $ | 19,030 |  |  | $ | 176,294 |
GSE CMOs | 62,567 |  |  | 4 |  |  | 7,028 |  |  | 55,543 |
GSE MBSs | 166,843 |  |  | 63 |  |  | 18,621 |  |  | 148,285 |
Municipal obligations | 20,526 |  |  | 19 |  |  | 291 |  |  | 20,254 |
Corporate debt obligations | 12,140 |  |  | 225 |  |  | 78 |  |  | 12,287 |
U.S. Treasury bonds | 506,714 |  |  | 331 |  |  | 25,173 |  |  | 481,872 |
Foreign government obligations | 500 |  |  | — |  |  | 1 |  |  | 499 |
Total investment securities available-for-sale | $ | 964,389 |  |  | $ | 867 |  |  | $ | 70,222 |  |  | $ | 895,034 |
Schedule of Investment Securities in a Continuous Unrealized Loss Position | Investment securities as of September 30, 2025 and December 31, 2024 that have been in a continuous unrealized loss position for less than twelve months or twelve months or longer are as follows:
| At September 30, 2025
| Less than Twelve Months |  | Twelve Months or Longer |  | Total
| Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
| (In Thousands)
Investment securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |
GSE debentures | $ | 150,401 |  |  | $ | 656 |  |  | $ | 106,262 |  |  | $ | 13,231 |  |  | $ | 256,663 |  |  | $ | 13,887 |
GSE CMOs | 56,878 |  |  | 302 |  |  | 45,998 |  |  | 6,354 |  |  | 102,876 |  |  | 6,656 |
GSE MBSs | 77,899 |  |  | 259 |  |  | 102,133 |  |  | 12,385 |  |  | 180,032 |  |  | 12,644 |
Municipal obligations | 15,038 |  |  | 162 |  |  | 3,735 |  |  | 40 |  |  | 18,773 |  |  | 202 |
Corporate debt obligations | 8,065 |  |  | 189 |  |  | 2,515 |  |  | 147 |  |  | 10,580 |  |  | 336 |
U.S. Treasury bonds | 9,953 |  |  | 2 |  |  | 246,715 |  |  | 15,512 |  |  | 256,668 |  |  | 15,514 |
Temporarily impaired investment securities available-for-sale | 318,234 |  |  | 1,570 |  |  | 507,358 |  |  | 47,669 |  |  | 825,592 |  |  | 49,239 |
Total temporarily impaired investment securities | $ | 318,234 |  |  | $ | 1,570 |  |  | $ | 507,358 |  |  | $ | 47,669 |  |  | $ | 825,592 |  |  | $ | 49,239 |
| At December 31, 2024
| Less than Twelve Months |  | Twelve Months or Longer |  | Total
| Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
| (In Thousands)
Investment securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |
GSE debentures | $ | 30,753 |  |  | $ | 281 |  |  | $ | 107,750 |  |  | $ | 18,749 |  |  | $ | 138,503 |  |  | $ | 19,030 |
GSE CMOs | 4,664 |  |  | 107 |  |  | 50,334 |  |  | 6,921 |  |  | 54,998 |  |  | 7,028 |
GSE MBSs | 11,128 |  |  | 596 |  |  | 131,481 |  |  | 18,025 |  |  | 142,609 |  |  | 18,621 |
Municipal obligations | 3,616 |  |  | 74 |  |  | 3,568 |  |  | 217 |  |  | 7,184 |  |  | 291 |
Corporate debt obligations | — |  |  | — |  |  | 2,550 |  |  | 78 |  |  | 2,550 |  |  | 78 |
U.S. Treasury bonds | 67,290 |  |  | 285 |  |  | 291,641 |  |  | 24,888 |  |  | 358,931 |  |  | 25,173 |
Foreign government obligations | — |  |  | — |  |  | 499 |  |  | 1 |  |  | 499 |  |  | 1 |
Temporarily impaired investment securities available-for-sale | 117,451 |  |  | 1,343 |  |  | 587,823 |  |  | 68,879 |  |  | 705,274 |  |  | 70,222 |
Total temporarily impaired investment securities | $ | 117,451 |  |  | $ | 1,343 |  |  | $ | 587,823 |  |  | $ | 68,879 |  |  | $ | 705,274 |  |  | $ | 70,222 |
Schedule of Maturities of the Investments in Debt Securities | The final stated maturities of the debt securities are as follows for the periods indicated:
| At September 30, 2025 |  | At December 31, 2024
| Amortized Cost |  | Estimated Fair Value |  | Weighted Average Rate |  | Amortized Cost |  | Estimated Fair Value |  | Weighted Average Rate
| (Dollars in Thousands)
Investment securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |
Within 1 year | $ | 169,460 |  |  | $ | 169,303 |  |  | 3.14 | % |  | $ | 103,337 |  |  | $ | 102,457 |  |  | 3.22 | %
After 1 year through 5 years | 482,450 |  |  | 463,265 |  |  | 2.79 | % |  | 449,289 |  |  | 434,608 |  |  | 3.32 | %
After 5 years through 10 years | 262,308 |  |  | 255,087 |  |  | 2.70 | % |  | 207,980 |  |  | 180,370 |  |  | 1.77 | %
Over 10 years | 863,001 |  |  | 851,768 |  |  | 2.41 | % |  | 203,783 |  |  | 177,599 |  |  | 3.13 | %
| $ | 1,777,219 |  |  | $ | 1,739,423 |  |  | 2.62 | % |  | $ | 964,389 |  |  | $ | 895,034 |  |  | 2.96 | %

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