Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	$ 2,434,389	$ 2,049,302
Available for sale, gross unrealized gains	3,492	4,432
Available for sale, gross unrealized losses	(211,338)	(217,714)
Debt securities available-for-sale	2,226,543	1,836,020
Held-to-Maturity Debt Securities
Held to maturity, amortized cost, total	635,186	680,313
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(127,592)	(121,954)
Held to maturity, fair value	507,594	558,359
U.S. Treasury securities and obligations of U.S. government agencies
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	28,233	37,718
Available for sale, gross unrealized gains	29	205
Available for sale, gross unrealized losses	(522)	(478)
Debt securities available-for-sale	27,740	37,445
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	1,777,274	1,152,753
Available for sale, gross unrealized gains	1,237	780
Available for sale, gross unrealized losses	(190,536)	(184,152)
Debt securities available-for-sale	1,587,975	969,381
Held-to-Maturity Debt Securities
Held to maturity, amortized cost, total	546,444	590,676
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(117,620)	(111,746)
Held to maturity, fair value	428,824	478,930
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	206,537	385,013
Available for sale, gross unrealized gains	1,195	2,824
Available for sale, gross unrealized losses	(10,283)	(19,565)
Debt securities available-for-sale	197,449	368,272
Held-to-Maturity Debt Securities
Held to maturity, amortized cost, total	88,742	89,637
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(9,972)	(10,208)
Held to maturity, fair value	78,770	79,429
Private mortgage-backed securities and collateralized mortgage obligations
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	129,475	135,878
Available for sale, gross unrealized gains	149	36
Available for sale, gross unrealized losses	(8,382)	(10,911)
Debt securities available-for-sale	121,242	125,003
Collateralized loan obligations
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	278,342	300,855
Available for sale, gross unrealized gains	788	11
Available for sale, gross unrealized losses	(166)	(1,411)
Debt securities available-for-sale	278,964	299,455
Obligations of state and political subdivisions
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	7,139	10,486
Available for sale, gross unrealized gains	0	0
Available for sale, gross unrealized losses	(1,449)	(1,096)
Debt securities available-for-sale	5,690	9,390
Other Debt Securities
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	7,389	26,599
Available for sale, gross unrealized gains	94	576
Available for sale, gross unrealized losses	0	(101)
Debt securities available-for-sale	$ 7,483	$ 27,074

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 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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