Securities - Schedule of Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
AFS Debt Securities
AFS, amortized cost	$ 5,266,294	$ 2,434,389
AFS, gross unrealized gains	48,658	3,492
AFS, gross unrealized losses	(150,385)	(211,338)
AFS, fair value	5,164,567	2,226,543
HTM Debt Securities
HTM, amortized cost	586,178	635,186
HTM, gross unrealized gains	0	0
HTM, gross unrealized losses	(96,618)	(127,592)
HTM, fair value	489,560	507,594
U.S. Treasury securities and obligations of U.S. government agencies
AFS Debt Securities
AFS, amortized cost	54,831	28,233
AFS, gross unrealized gains	365	29
AFS, gross unrealized losses	(451)	(522)
AFS, fair value	54,745	27,740
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
AFS Debt Securities
AFS, amortized cost	3,681,499	1,777,274
AFS, gross unrealized gains	41,388	1,237
AFS, gross unrealized losses	(135,388)	(190,536)
AFS, fair value	3,587,499	1,587,975
HTM Debt Securities
HTM, amortized cost	498,931	546,444
HTM, gross unrealized gains	0	0
HTM, gross unrealized losses	(90,696)	(117,620)
HTM, fair value	408,235	428,824
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
AFS Debt Securities
AFS, amortized cost	395,165	206,537
AFS, gross unrealized gains	4,636	1,195
AFS, gross unrealized losses	(5,928)	(10,283)
AFS, fair value	393,873	197,449
HTM Debt Securities
HTM, amortized cost	87,247	88,742
HTM, gross unrealized gains	0	0
HTM, gross unrealized losses	(5,922)	(9,972)
HTM, fair value	81,325	78,770
Private mortgage-backed securities and collateralized mortgage obligations
AFS Debt Securities
AFS, amortized cost	131,846	129,475
AFS, gross unrealized gains	561	149
AFS, gross unrealized losses	(5,010)	(8,382)
AFS, fair value	127,397	121,242
CLOs
AFS Debt Securities
AFS, amortized cost	423,864	278,342
AFS, gross unrealized gains	636	788
AFS, gross unrealized losses	(512)	(166)
AFS, fair value	423,988	278,964
Obligations of state and political subdivisions
AFS Debt Securities
AFS, amortized cost	336,417	7,139
AFS, gross unrealized gains	651	0
AFS, gross unrealized losses	(2,520)	(1,449)
AFS, fair value	334,548	5,690
Other debt securities
AFS Debt Securities
AFS, amortized cost	242,672	7,389
AFS, gross unrealized gains	421	94
AFS, gross unrealized losses	(576)	0
AFS, fair value	$ 242,517	$ 7,483

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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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).

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Amortized cost excluding accrued interest, after allowance for credit loss, of 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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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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