Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	$ 2,325,199	$ 2,049,302
Available for sale, gross unrealized gains	13,806	4,432
Available for sale, gross unrealized losses	(178,950)	(217,714)
Available for sale, fair value	2,160,055	1,836,020
Held-to-Maturity Debt Securities
Held to maturity, amortized cost, total	646,050	680,313
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(107,565)	(121,954)
Held to maturity, fair value	538,485	558,359
U.S. Treasury securities and obligations of U.S. government agencies
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	30,542	37,718
Available for sale, gross unrealized gains	375	205
Available for sale, gross unrealized losses	(335)	(478)
Available for sale, fair value	30,582	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	1,558,076	1,152,753
Available for sale, gross unrealized gains	8,560	780
Available for sale, gross unrealized losses	(158,627)	(184,152)
Available for sale, fair value	1,408,009	969,381
Held-to-Maturity Debt Securities
Held to maturity, amortized cost, total	557,119	590,676
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(99,722)	(111,746)
Held to maturity, fair value	457,397	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	299,975	385,013
Available for sale, gross unrealized gains	3,860	2,824
Available for sale, gross unrealized losses	(11,586)	(19,565)
Available for sale, fair value	292,249	368,272
Held-to-Maturity Debt Securities
Held to maturity, amortized cost, total	88,931	89,637
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(7,843)	(10,208)
Held to maturity, fair value	81,088	79,429
Private mortgage-backed securities and collateralized mortgage obligations
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	136,038	135,878
Available for sale, gross unrealized gains	288	36
Available for sale, gross unrealized losses	(7,028)	(10,911)
Available for sale, fair value	129,298	125,003
Collateralized loan obligations
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	286,042	300,855
Available for sale, gross unrealized gains	648	11
Available for sale, gross unrealized losses	(158)	(1,411)
Available for sale, fair value	286,532	299,455
Obligations of state and political subdivisions
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	7,137	10,486
Available for sale, gross unrealized gains	9	0
Available for sale, gross unrealized losses	(1,216)	(1,096)
Available for sale, fair value	5,930	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	66	576
Available for sale, gross unrealized losses	0	(101)
Available for sale, fair value	$ 7,455	$ 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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