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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

X

- 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).

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