Investment Securities - Securities Available for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 2,844,518	$ 1,901,798
Gross unrealized gains	11,457	2,159
Gross unrealized losses	(229,192)	(213,845)
Fair value	2,626,783	1,690,112
U.S. Treasury obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	358,744	276,618
Gross unrealized gains	2	0
Gross unrealized losses	(23,715)	(22,740)
Fair value	335,031	253,878
Government-agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	164,690	26,310
Gross unrealized gains	1,672	1,188
Gross unrealized losses	(160)	0
Fair value	166,202	27,498
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,032,733	1,462,159
Gross unrealized gains	7,058	377
Gross unrealized losses	(190,607)	(176,927)
Fair value	1,849,184	1,285,609
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	52,470	31,809
Gross unrealized gains	807	594
Gross unrealized losses	(224)	(168)
Fair value	53,053	32,235
State and municipal obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	136,407	64,454
Gross unrealized gains	309	0
Gross unrealized losses	(10,158)	(7,870)
Fair value	126,558	56,584
Corporate obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	99,474	40,448
Gross unrealized gains	1,609	0
Gross unrealized losses	(4,328)	(6,140)
Fair value	$ 96,755	$ 34,308

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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