Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	$ 2,191,952	$ 2,049,302
Available for sale, gross unrealized gains	3,334	4,432
Available for sale, gross unrealized losses	(228,082)	(217,714)
Available for sale, fair value	1,967,204	1,836,020
Held-to-Maturity Debt Securities
Held to maturity, amortized cost, total	658,055	680,313
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(130,728)	(121,954)
Held to maturity, fair value	527,327	558,359
U.S. Treasury securities and obligations of U.S. government agencies
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	52,081	37,718
Available for sale, gross unrealized gains	84	205
Available for sale, gross unrealized losses	(526)	(478)
Available for sale, fair value	51,639	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	1,410,486	1,152,753
Available for sale, gross unrealized gains	930	780
Available for sale, gross unrealized losses	(197,486)	(184,152)
Available for sale, fair value	1,213,930	969,381
Held-to-Maturity Debt Securities
Held to maturity, amortized cost, total	568,957	590,676
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(119,883)	(111,746)
Held to maturity, fair value	449,074	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	315,649	385,013
Available for sale, gross unrealized gains	1,508	2,824
Available for sale, gross unrealized losses	(17,993)	(19,565)
Available for sale, fair value	299,164	368,272
Held-to-Maturity Debt Securities
Held to maturity, amortized cost, total	89,098	89,637
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(10,845)	(10,208)
Held to maturity, fair value	78,253	79,429
Private mortgage-backed securities and collateralized mortgage obligations
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	131,251	135,878
Available for sale, gross unrealized gains	60	36
Available for sale, gross unrealized losses	(10,633)	(10,911)
Available for sale, fair value	120,678	125,003
Collateralized loan obligations
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	267,780	300,855
Available for sale, gross unrealized gains	662	11
Available for sale, gross unrealized losses	(82)	(1,411)
Available for sale, fair value	268,360	299,455
Obligations of state and political subdivisions
Available-for-Sale Debt Securities
Available for sale, amortized cost, total	7,316	10,486
Available for sale, gross unrealized gains	0	0
Available for sale, gross unrealized losses	(1,362)	(1,096)
Available for sale, fair value	5,954	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	90	576
Available for sale, gross unrealized losses	0	(101)
Available for sale, fair value	$ 7,479	$ 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 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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