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Investment Securities - Schedule of Securities Available-for-sale (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Total | $ 1,777,219 | $ 964,389
Investment securities available-for-sale, Gross Unrealized Gains | 11,443 | 867
Investment securities available-for-sale, Gross Unrealized Losses | 49,239 | 70,222
Investment securities available-for-sale, estimated fair value | 1,739,423 | 895,034
GSE debentures |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 341,753 | 195,099
Investment securities available-for-sale, Gross Unrealized Gains | 485 | 225
Investment securities available-for-sale, Gross Unrealized Losses | 13,887 | 19,030
Investment securities available-for-sale, estimated fair value | 328,351 | 176,294
GSE CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 343,654 | 62,567
Investment securities available-for-sale, Gross Unrealized Gains | 2,703 | 4
Investment securities available-for-sale, Gross Unrealized Losses | 6,656 | 7,028
Investment securities available-for-sale, estimated fair value | 339,701 | 55,543
GSE MBSs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 343,731 | 166,843
Investment securities available-for-sale, Gross Unrealized Gains | 1,307 | 63
Investment securities available-for-sale, Gross Unrealized Losses | 12,644 | 18,621
Investment securities available-for-sale, estimated fair value | 332,394 | 148,285
Municipal obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 230,685 | 20,526
Investment securities available-for-sale, Gross Unrealized Gains | 4,951 | 19
Investment securities available-for-sale, Gross Unrealized Losses | 202 | 291
Investment securities available-for-sale, estimated fair value | 235,434 | 20,254
Corporate debt obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 48,178 | 12,140
Investment securities available-for-sale, Gross Unrealized Gains | 413 | 225
Investment securities available-for-sale, Gross Unrealized Losses | 336 | 78
Investment securities available-for-sale, estimated fair value | 48,255 | 12,287
U.S. Treasury bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 468,718 | 506,714
Investment securities available-for-sale, Gross Unrealized Gains | 1,584 | 331
Investment securities available-for-sale, Gross Unrealized Losses | 15,514 | 25,173
Investment securities available-for-sale, estimated fair value | 454,788 | 481,872
Foreign government obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 500 | 500
Investment securities available-for-sale, Gross Unrealized Gains | 0 | 0
Investment securities available-for-sale, Gross Unrealized Losses | 0 | 1
Investment securities available-for-sale, estimated fair value | $ 500 | $ 499

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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