Investment Securities -Schedule of Investment Securities Available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,716,218	$ 964,389
Gross Unrealized Gains	17,200	867
Gross Unrealized Losses	44,650	70,222
Estimated Fair Value	1,688,768	895,034
GSE debentures
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	185,449	195,099
Gross Unrealized Gains	512	225
Gross Unrealized Losses	12,284	19,030
Estimated Fair Value	173,677	176,294
GSE CMOs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	500,446	62,567
Gross Unrealized Gains	2,784	4
Gross Unrealized Losses	6,660	7,028
Estimated Fair Value	496,570	55,543
GSE MBSs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	334,476	166,843
Gross Unrealized Gains	3,009	63
Gross Unrealized Losses	11,740	18,621
Estimated Fair Value	325,745	148,285
Municipal obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	231,924	20,526
Gross Unrealized Gains	8,305	19
Gross Unrealized Losses	13	291
Estimated Fair Value	240,216	20,254
Corporate debt obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	39,209	12,140
Gross Unrealized Gains	863	225
Gross Unrealized Losses	49	78
Estimated Fair Value	40,023	12,287
U.S. Treasury bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	424,214	506,714
Gross Unrealized Gains	1,727	331
Gross Unrealized Losses	13,904	25,173
Estimated Fair Value	412,037	481,872
Foreign government obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	500	500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	1
Estimated Fair Value	$ 500	$ 499