Securities - Schedule of Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
AFS Debt Securities
Available for sale, amortized cost, total	$ 4,983,039	$ 5,266,294
Available for sale, gross unrealized gains	1,078	48,658
Available for sale, gross unrealized losses	(349,762)	(150,385)
Available for sale, fair value	4,634,355	5,164,567
HTM Debt Securities
Held to maturity, amortized cost, total	552,982	586,178
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(117,671)	(96,618)
Held to maturity, fair value	435,311	489,560
U.S. Treasury securities and obligations of U.S. government agencies
AFS Debt Securities
Available for sale, amortized cost, total	60,756	54,831
Available for sale, gross unrealized gains	8	365
Available for sale, gross unrealized losses	(2,702)	(451)
Available for sale, fair value	58,062	54,745
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
AFS Debt Securities
Available for sale, amortized cost, total	3,728,834	3,681,499
Available for sale, gross unrealized gains	195	41,388
Available for sale, gross unrealized losses	(297,828)	(135,388)
Available for sale, fair value	3,431,201	3,587,499
HTM Debt Securities
Held to maturity, amortized cost, total	466,721	498,931
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(109,805)	(90,696)
Held to maturity, fair value	356,916	408,235
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
AFS Debt Securities
Available for sale, amortized cost, total	284,625	395,165
Available for sale, gross unrealized gains	207	4,636
Available for sale, gross unrealized losses	(11,177)	(5,928)
Available for sale, fair value	273,655	393,873
HTM Debt Securities
Held to maturity, amortized cost, total	86,261	87,247
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(7,866)	(5,922)
Held to maturity, fair value	78,395	81,325
Private mortgage-backed securities and collateralized mortgage obligations
AFS Debt Securities
Available for sale, amortized cost, total	81,000	131,846
Available for sale, gross unrealized gains	108	561
Available for sale, gross unrealized losses	(6,590)	(5,010)
Available for sale, fair value	74,518	127,397
CLOs
AFS Debt Securities
Available for sale, amortized cost, total	317,266	423,864
Available for sale, gross unrealized gains	508	636
Available for sale, gross unrealized losses	(858)	(512)
Available for sale, fair value	316,916	423,988
Obligations of state and political subdivisions
AFS Debt Securities
Available for sale, amortized cost, total	333,779	336,417
Available for sale, gross unrealized gains	0	651
Available for sale, gross unrealized losses	(23,647)	(2,520)
Available for sale, fair value	310,132	334,548
Other debt securities
AFS Debt Securities
Available for sale, amortized cost, total	176,779	242,672
Available for sale, gross unrealized gains	52	421
Available for sale, gross unrealized losses	(6,960)	(576)
Available for sale, fair value	$ 169,871	$ 242,517

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

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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