Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
AFS Debt Securities
Available for sale, amortized cost, total	$ 3,021,970	$ 2,434,389
Available for sale, gross unrealized gains	17,641	3,492
Available for sale, gross unrealized losses	(173,426)	(211,338)
Available for sale, fair value	2,866,185	2,226,543
HTM Debt Securities
Held to maturity, amortized cost, total	613,312	635,186
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(110,125)	(127,592)
Held to maturity, fair value	503,187	507,594
U.S. Treasury securities and obligations of U.S. government agencies
AFS Debt Securities
Available for sale, amortized cost, total	25,237	28,233
Available for sale, gross unrealized gains	219	29
Available for sale, gross unrealized losses	(377)	(522)
Available for sale, fair value	25,079	27,740
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
AFS Debt Securities
Available for sale, amortized cost, total	2,338,389	1,777,274
Available for sale, gross unrealized gains	12,783	1,237
Available for sale, gross unrealized losses	(157,623)	(190,536)
Available for sale, fair value	2,193,549	1,587,975
HTM Debt Securities
Held to maturity, amortized cost, total	525,437	546,444
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(102,879)	(117,620)
Held to maturity, fair value	422,558	428,824
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
AFS Debt Securities
Available for sale, amortized cost, total	272,432	206,537
Available for sale, gross unrealized gains	3,760	1,195
Available for sale, gross unrealized losses	(7,140)	(10,283)
Available for sale, fair value	269,052	197,449
HTM Debt Securities
Held to maturity, amortized cost, total	87,875	88,742
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(7,246)	(9,972)
Held to maturity, fair value	80,629	78,770
Private mortgage-backed securities and collateralized mortgage obligations
AFS Debt Securities
Available for sale, amortized cost, total	113,420	129,475
Available for sale, gross unrealized gains	281	149
Available for sale, gross unrealized losses	(6,289)	(8,382)
Available for sale, fair value	107,412	121,242
CLOs
AFS Debt Securities
Available for sale, amortized cost, total	257,962	278,342
Available for sale, gross unrealized gains	540	788
Available for sale, gross unrealized losses	(597)	(166)
Available for sale, fair value	257,905	278,964
Obligations of state and political subdivisions
AFS Debt Securities
Available for sale, amortized cost, total	7,141	7,139
Available for sale, gross unrealized gains	0	0
Available for sale, gross unrealized losses	(1,400)	(1,449)
Available for sale, fair value	5,741	5,690
Other debt securities
AFS Debt Securities
Available for sale, amortized cost, total	7,389	7,389
Available for sale, gross unrealized gains	58	94
Available for sale, gross unrealized losses	0	0
Available for sale, fair value	$ 7,447	$ 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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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 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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