Securities - Schedule of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	$ 1,154,105	$ 759,201
Less than 12 Months, Unrealized Loss	(239,336)	(13,966)
12 Months or More, Fair Value	527,847	45,615
12 Months or More, Unrealized Loss	(151,675)	(1,683)
Total Fair Value	1,681,952	804,816
Total Unrealized Loss	(391,011)	(15,649)
U.S. Treasury and Agency Securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	1,500
Less than 12 Months, Unrealized Loss	0
12 Months or More, Fair Value	0
12 Months or More, Unrealized Loss	0
Total Fair Value	1,500
Total Unrealized Loss	0
Obligations of State and Political Subdivisions
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	650,343	165,210
Less than 12 Months, Unrealized Loss	(164,072)	(1,386)
12 Months or More, Fair Value	102,093	1,500
12 Months or More, Unrealized Loss	(47,999)	(94)
Total Fair Value	752,436	166,710
Total Unrealized Loss	(212,071)	(1,480)
MBS/CMO
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	297,481	467,888
Less than 12 Months, Unrealized Loss	(38,378)	(9,100)
12 Months or More, Fair Value	419,507	36,827
12 Months or More, Unrealized Loss	(102,426)	(1,381)
Total Fair Value	716,988	504,715
Total Unrealized Loss	(140,804)	(10,481)
US Gov’t Sponsored Entities & Agencies
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	204,781	126,103
Less than 12 Months, Unrealized Loss	(36,886)	(3,480)
12 Months or More, Fair Value	6,247	7,288
12 Months or More, Unrealized Loss	(1,250)	(208)
Total Fair Value	211,028	133,391
Total Unrealized Loss	$ (38,136)	$ (3,688)