Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
AFS Debt Securities
Available for sale, amortized cost, total	$ 3,332,322	$ 2,434,389
Available for sale, gross unrealized gains	34,891	3,492
Available for sale, gross unrealized losses	(155,133)	(211,338)
Available for sale, fair value	3,212,080	2,226,543
HTM Debt Securities
Held to maturity, amortized cost, total	598,604	635,186
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(100,220)	(127,592)
Held to maturity, fair value	498,384	507,594
U.S. Treasury securities and obligations of U.S. government agencies
AFS Debt Securities
Available for sale, amortized cost, total	41,205	28,233
Available for sale, gross unrealized gains	346	29
Available for sale, gross unrealized losses	(432)	(522)
Available for sale, fair value	41,119	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	2,654,711	1,777,274
Available for sale, gross unrealized gains	28,944	1,237
Available for sale, gross unrealized losses	(141,197)	(190,536)
Available for sale, fair value	2,542,458	1,587,975
HTM Debt Securities
Held to maturity, amortized cost, total	511,031	546,444
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(93,719)	(117,620)
Held to maturity, fair value	417,312	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	299,739	206,537
Available for sale, gross unrealized gains	4,478	1,195
Available for sale, gross unrealized losses	(6,471)	(10,283)
Available for sale, fair value	297,746	197,449
HTM Debt Securities
Held to maturity, amortized cost, total	87,573	88,742
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(6,501)	(9,972)
Held to maturity, fair value	81,072	78,770
Private mortgage-backed securities and collateralized mortgage obligations
AFS Debt Securities
Available for sale, amortized cost, total	103,825	129,475
Available for sale, gross unrealized gains	348	149
Available for sale, gross unrealized losses	(5,582)	(8,382)
Available for sale, fair value	98,591	121,242
CLOs
AFS Debt Securities
Available for sale, amortized cost, total	216,818	278,342
Available for sale, gross unrealized gains	698	788
Available for sale, gross unrealized losses	(309)	(166)
Available for sale, fair value	217,207	278,964
Obligations of state and political subdivisions
AFS Debt Securities
Available for sale, amortized cost, total	8,635	7,139
Available for sale, gross unrealized gains	1	0
Available for sale, gross unrealized losses	(1,142)	(1,449)
Available for sale, fair value	7,494	5,690
Other debt securities
AFS Debt Securities
Available for sale, amortized cost, total	7,389	7,389
Available for sale, gross unrealized gains	76	94
Available for sale, gross unrealized losses	0	0
Available for sale, fair value	$ 7,465	$ 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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