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Investment Securities - Schedule of Investment Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Investment securities available-for-sale: |  |
Less than twelve months, estimated fair value | $ 318,234 | $ 117,451
Less than twelve months, unrealized losses | 1,570 | 1,343
Twelve months or longer, estimated fair value | 507,358 | 587,823
Twelve months or longer, unrealized losses | 47,669 | 68,879
Debt securities, available-for-sale, unrealized loss position | 825,592 | 705,274
Total, unrealized losses | 49,239 | 70,222
Total temporarily impaired investment securities |  |
Less than twelve months, estimated fair value | 318,234 | 117,451
Less than twelve months, unrealized losses | 1,570 | 1,343
Twelve months or longer, estimated fair value | 507,358 | 587,823
Twelve months or longer, unrealized losses | 47,669 | 68,879
Total, estimated fair value | 825,592 | 705,274
Total, unrealized losses | 49,239 | 70,222
GSE debentures |  |
Investment securities available-for-sale: |  |
Less than twelve months, estimated fair value | 150,401 | 30,753
Less than twelve months, unrealized losses | 656 | 281
Twelve months or longer, estimated fair value | 106,262 | 107,750
Twelve months or longer, unrealized losses | 13,231 | 18,749
Debt securities, available-for-sale, unrealized loss position | 256,663 | 138,503
Total, unrealized losses | 13,887 | 19,030
GSE CMOs |  |
Investment securities available-for-sale: |  |
Less than twelve months, estimated fair value | 56,878 | 4,664
Less than twelve months, unrealized losses | 302 | 107
Twelve months or longer, estimated fair value | 45,998 | 50,334
Twelve months or longer, unrealized losses | 6,354 | 6,921
Debt securities, available-for-sale, unrealized loss position | 102,876 | 54,998
Total, unrealized losses | 6,656 | 7,028
GSE MBSs |  |
Investment securities available-for-sale: |  |
Less than twelve months, estimated fair value | 77,899 | 11,128
Less than twelve months, unrealized losses | 259 | 596
Twelve months or longer, estimated fair value | 102,133 | 131,481
Twelve months or longer, unrealized losses | 12,385 | 18,025
Debt securities, available-for-sale, unrealized loss position | 180,032 | 142,609
Total, unrealized losses | 12,644 | 18,621
Municipal obligations |  |
Investment securities available-for-sale: |  |
Less than twelve months, estimated fair value | 15,038 | 3,616
Less than twelve months, unrealized losses | 162 | 74
Twelve months or longer, estimated fair value | 3,735 | 3,568
Twelve months or longer, unrealized losses | 40 | 217
Debt securities, available-for-sale, unrealized loss position | 18,773 | 7,184
Total, unrealized losses | 202 | 291
Corporate debt obligations |  |
Investment securities available-for-sale: |  |
Less than twelve months, estimated fair value | 8,065 | 0
Less than twelve months, unrealized losses | 189 | 0
Twelve months or longer, estimated fair value | 2,515 | 2,550
Twelve months or longer, unrealized losses | 147 | 78
Debt securities, available-for-sale, unrealized loss position | 10,580 | 2,550
Total, unrealized losses | 336 | 78
U.S. Treasury bonds |  |
Investment securities available-for-sale: |  |
Less than twelve months, estimated fair value | 9,953 | 67,290
Less than twelve months, unrealized losses | 2 | 285
Twelve months or longer, estimated fair value | 246,715 | 291,641
Twelve months or longer, unrealized losses | 15,512 | 24,888
Debt securities, available-for-sale, unrealized loss position | 256,668 | 358,931
Total, unrealized losses | $ 15,514 | 25,173
Foreign government obligations |  |
Investment securities available-for-sale: |  |
Less than twelve months, estimated fair value |  | 0
Less than twelve months, unrealized losses |  | 0
Twelve months or longer, estimated fair value |  | 499
Twelve months or longer, unrealized losses |  | 1
Debt securities, available-for-sale, unrealized loss position |  | 499
Total, unrealized losses |  | $ 1

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