Securities - Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Fair value less than 12 months	$ 150,568	$ 880,068
Unrealized losses less than 12 months	(4,378)	(75,452)
Fair value more than 12 months	2,366,900	1,719,396
Unrealized losses more than 12 months	(439,038)	(406,840)
Total fair value	2,517,468	2,599,464
Total unrealized losses	(443,416)	(482,292)
U.S. Treasury and federal agencies
Schedule of Available-for-sale Securities [Line Items]
Fair value less than 12 months	1,948	217,357
Unrealized losses less than 12 months	(20)	(16,692)
Fair value more than 12 months	508,535	295,585
Unrealized losses more than 12 months	(71,714)	(59,695)
Total fair value	510,483	512,942
Total unrealized losses	(71,734)	(76,387)
State and municipal
Schedule of Available-for-sale Securities [Line Items]
Fair value less than 12 months	135,580	533,871
Unrealized losses less than 12 months	(3,239)	(45,881)
Fair value more than 12 months	1,111,320	757,061
Unrealized losses more than 12 months	(231,907)	(218,179)
Total fair value	1,246,900	1,290,932
Total unrealized losses	(235,146)	(264,060)
Federal agency collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Fair value less than 12 months	880	40,301
Unrealized losses less than 12 months	(54)	(2,881)
Fair value more than 12 months	67,482	38,613
Unrealized losses more than 12 months	(10,181)	(7,780)
Total fair value	68,362	78,914
Total unrealized losses	(10,235)	(10,661)
Federal agency mortgage-backed pools
Schedule of Available-for-sale Securities [Line Items]
Fair value less than 12 months	7,204	49,633
Unrealized losses less than 12 months	(305)	(3,211)
Fair value more than 12 months	451,055	428,243
Unrealized losses more than 12 months	(81,428)	(83,810)
Total fair value	458,259	477,876
Total unrealized losses	(81,733)	(87,021)
Private labeled mortgage-backed pools
Schedule of Available-for-sale Securities [Line Items]
Fair value less than 12 months	0	0
Unrealized losses less than 12 months	0	0
Fair value more than 12 months	28,662	29,973
Unrealized losses more than 12 months	(5,186)	(5,493)
Total fair value	28,662	29,973
Total unrealized losses	(5,186)	(5,493)
Corporate notes
Schedule of Available-for-sale Securities [Line Items]
Fair value less than 12 months	4,956	38,906
Unrealized losses less than 12 months	(760)	(6,787)
Fair value more than 12 months	199,846	169,921
Unrealized losses more than 12 months	(38,622)	(31,883)
Total fair value	204,802	208,827
Total unrealized losses	$ (39,382)	$ (38,670)