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Securities - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Securities Financing Transaction [Line Items]
Available-for-sale, amortized cost	$ 489,939	$ 503,404
Available-for-sale, gross unrealized gains	4	1
Available-for-sale, gross unrealized losses	(37,748)	(45,757)
Available-for-sale, fair value	452,195	457,648
Allowance for Credit Losses	0	0
Amortized Cost	1,248,630	1,224,564
Held-to-maturity, gross unrealized gains	2,547	1,244
Held-to-maturity, gross unrealized losses	(101,504)	(115,767)
Debt securities held-to-maturity	1,149,673	1,110,041
Allowance for Credit Losses	(1,043)	(1,128)	$ (1,380)	$ (1,467)
Total, amortized cost	1,738,569	1,727,968
Total, gross unrealized gains	2,551	1,245
Total, gross unrealized losses	(139,252)	(161,524)
Total, estimated fair value	1,601,868	1,567,689
U.S. government and agency obligations
Securities Financing Transaction [Line Items]
Available-for-sale, amortized cost	73,305	87,648
Available-for-sale, gross unrealized gains	4	1
Available-for-sale, gross unrealized losses	(6,643)	(7,635)
Available-for-sale, fair value	66,666	80,014
Allowance for Credit Losses	0	0
Corporate debt securities
Securities Financing Transaction [Line Items]
Available-for-sale, amortized cost	10,077	8,928
Available-for-sale, gross unrealized gains	0	0
Available-for-sale, gross unrealized losses	(616)	(756)
Available-for-sale, fair value	9,461	8,172
Allowance for Credit Losses	0	0
Amortized Cost	54,930	56,893
Held-to-maturity, gross unrealized gains	42	380
Held-to-maturity, gross unrealized losses	(4,171)	(3,778)
Debt securities held-to-maturity	50,801	53,495
Allowance for Credit Losses	(976)	(1,059)
Asset-backed securities
Securities Financing Transaction [Line Items]
Available-for-sale, amortized cost	296,217	296,222
Available-for-sale, gross unrealized gains	0	0
Available-for-sale, gross unrealized losses	(14,448)	(19,349)
Available-for-sale, fair value	281,769	276,873
Allowance for Credit Losses	0	0
Agency commercial
Securities Financing Transaction [Line Items]
Available-for-sale, amortized cost	110,340	110,606
Available-for-sale, gross unrealized gains	0	0
Available-for-sale, gross unrealized losses	(16,041)	(18,017)
Available-for-sale, fair value	94,299	92,589
Allowance for Credit Losses	0	0
Amortized Cost	31,887	32,127
Held-to-maturity, gross unrealized gains	90	23
Held-to-maturity, gross unrealized losses	(553)	(1,189)
Debt securities held-to-maturity	31,424	30,961
Allowance for Credit Losses	0	0
State, municipal and sovereign debt obligations
Securities Financing Transaction [Line Items]
Amortized Cost	254,311	260,249
Held-to-maturity, gross unrealized gains	104	46
Held-to-maturity, gross unrealized losses	(19,342)	(24,940)
Debt securities held-to-maturity	235,073	235,355
Allowance for Credit Losses	(56)	(60)
Agency residential
Securities Financing Transaction [Line Items]
Amortized Cost	882,211	849,985
Held-to-maturity, gross unrealized gains	2,311	795
Held-to-maturity, gross unrealized losses	(75,309)	(83,586)
Debt securities held-to-maturity	809,213	767,194
Allowance for Credit Losses	0	0
Non-agency commercial
Securities Financing Transaction [Line Items]
Amortized Cost	25,291	25,310
Held-to-maturity, gross unrealized gains	0	0
Held-to-maturity, gross unrealized losses	(2,129)	(2,274)
Debt securities held-to-maturity	23,162	23,036
Allowance for Credit Losses	(11)	(9)
Total mortgage-backed securities
Securities Financing Transaction [Line Items]
Amortized Cost	939,389	907,422
Held-to-maturity, gross unrealized gains	2,401	818
Held-to-maturity, gross unrealized losses	(77,991)	(87,049)
Debt securities held-to-maturity	863,799	821,191
Allowance for Credit Losses	$ (11)	$ (9)

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