Securities - Schedule of Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
AFS Debt Securities
Available for sale, amortized cost, total	$ 5,286,332	$ 5,266,294
Available for sale, gross unrealized gains	24,384	48,658
Available for sale, gross unrealized losses	(136,114)	(150,385)
Available for sale, fair value	5,174,602	5,164,567
HTM Debt Securities
Held to maturity, amortized cost, total	564,067	586,178
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(98,349)	(96,618)
Held to maturity, fair value	465,718	489,560
U.S. Treasury securities and obligations of U.S. government agencies
AFS Debt Securities
Available for sale, amortized cost, total	61,647	54,831
Available for sale, gross unrealized gains	165	365
Available for sale, gross unrealized losses	(941)	(451)
Available for sale, fair value	60,871	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	3,779,175	3,681,499
Available for sale, gross unrealized gains	19,016	41,388
Available for sale, gross unrealized losses	(121,168)	(135,388)
Available for sale, fair value	3,677,023	3,587,499
HTM Debt Securities
Held to maturity, amortized cost, total	477,449	498,931
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(92,085)	(90,696)
Held to maturity, fair value	385,364	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	361,779	395,165
Available for sale, gross unrealized gains	2,635	4,636
Available for sale, gross unrealized losses	(4,986)	(5,928)
Available for sale, fair value	359,428	393,873
HTM Debt Securities
Held to maturity, amortized cost, total	86,618	87,247
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(6,264)	(5,922)
Held to maturity, fair value	80,354	81,325
Private mortgage-backed securities and collateralized mortgage obligations
AFS Debt Securities
Available for sale, amortized cost, total	85,347	131,846
Available for sale, gross unrealized gains	214	561
Available for sale, gross unrealized losses	(5,074)	(5,010)
Available for sale, fair value	80,487	127,397
CLOs
AFS Debt Securities
Available for sale, amortized cost, total	419,898	423,864
Available for sale, gross unrealized gains	515	636
Available for sale, gross unrealized losses	(858)	(512)
Available for sale, fair value	419,555	423,988
Obligations of state and political subdivisions
AFS Debt Securities
Available for sale, amortized cost, total	334,172	336,417
Available for sale, gross unrealized gains	1,520	651
Available for sale, gross unrealized losses	(1,143)	(2,520)
Available for sale, fair value	334,549	334,548
Other debt securities
AFS Debt Securities
Available for sale, amortized cost, total	244,314	242,672
Available for sale, gross unrealized gains	319	421
Available for sale, gross unrealized losses	(1,944)	(576)
Available for sale, fair value	$ 242,689	$ 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, 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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