Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt securities available-for-sale
Available for sale, amortized cost, total	$ 2,049,302	$ 2,119,303
Available for sale, gross unrealized gains	4,432	1,101
Available for sale, gross unrealized losses	(217,714)	(248,662)
Debt securities available-for-sale	1,836,020	1,871,742
Debt securities held-to-maturity
Held to maturity, amortized cost, total	680,313	747,408
Held to maturity, gross unrealized gains	0	64
Held to maturity, gross unrealized losses	(121,954)	(129,731)
Held to maturity, fair value	558,359	617,741
U.S. Treasury securities and obligations of U.S. government agencies
Debt securities available-for-sale
Available for sale, amortized cost, total	37,718	13,813
Available for sale, gross unrealized gains	205	173
Available for sale, gross unrealized losses	(478)	(339)
Debt securities available-for-sale	37,445	13,647
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Debt securities available-for-sale
Available for sale, amortized cost, total	1,152,753	1,170,062
Available for sale, gross unrealized gains	780	539
Available for sale, gross unrealized losses	(184,152)	(196,272)
Debt securities available-for-sale	969,381	974,329
Debt securities held-to-maturity
Held to maturity, amortized cost, total	590,676	634,300
Held to maturity, gross unrealized gains	0	64
Held to maturity, gross unrealized losses	(111,746)	(116,711)
Held to maturity, fair value	478,930	517,653
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Debt securities available-for-sale
Available for sale, amortized cost, total	385,013	391,135
Available for sale, gross unrealized gains	2,824	0
Available for sale, gross unrealized losses	(19,565)	(26,811)
Debt securities available-for-sale	368,272	364,324
Debt securities held-to-maturity
Held to maturity, amortized cost, total	89,637	113,108
Held to maturity, gross unrealized gains	0	0
Held to maturity, gross unrealized losses	(10,208)	(13,020)
Held to maturity, fair value	79,429	100,088
Private mortgage-backed securities and collateralized mortgage obligations
Debt securities available-for-sale
Available for sale, amortized cost, total	135,878	179,148
Available for sale, gross unrealized gains	36	70
Available for sale, gross unrealized losses	(10,911)	(12,831)
Debt securities available-for-sale	125,003	166,387
Collateralized loan obligations
Debt securities available-for-sale
Available for sale, amortized cost, total	300,855	313,155
Available for sale, gross unrealized gains	11	0
Available for sale, gross unrealized losses	(1,411)	(10,251)
Debt securities available-for-sale	299,455	302,904
Obligations of state and political subdivisions
Debt securities available-for-sale
Available for sale, amortized cost, total	10,486	29,350
Available for sale, gross unrealized gains	0	122
Available for sale, gross unrealized losses	(1,096)	(1,731)
Debt securities available-for-sale	9,390	27,741
Other debt securities
Debt securities available-for-sale
Available for sale, amortized cost, total	26,599	22,640
Available for sale, gross unrealized gains	576	197
Available for sale, gross unrealized losses	(101)	(427)
Debt securities available-for-sale	$ 27,074	$ 22,410

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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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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