Securities - Unrealized Loss on Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
AVAILABLE FOR SALE
Less than 12 Months, fair value	$ 1,393,355	$ 311,552
Less than 12 Months, unrealized loss	166,856	3,891
More than 12 Months, fair value	6,641	17,450
More than 12 Months, unrealized Loss	1,829	1,059
Total fair value	1,399,996	329,002
Total unrealized loss	168,685	4,950
HELD TO MATURITY
Less than 12 months, fair value	853,678
Less than 12 months, unrealized loss	177,678
More than 12 months, fair value	88,823
More than 12 months, unrealized loss	30,227
Total fair value	942,501
Total unrealized loss	207,905
US Treasury Securities
AVAILABLE FOR SALE
Less than 12 Months, fair value		9,947
Less than 12 Months, unrealized loss		50
More than 12 Months, fair value		0
More than 12 Months, unrealized Loss		0
Total fair value		9,947
Total unrealized loss		50
State and political subdivisions
AVAILABLE FOR SALE
Less than 12 Months, fair value	1,026,787	260,509
Less than 12 Months, unrealized loss	146,634	3,622
More than 12 Months, fair value	3,862	7,608
More than 12 Months, unrealized Loss	1,070	592
Total fair value	1,030,649	268,117
Total unrealized loss	147,704	4,214
HELD TO MATURITY
Less than 12 months, fair value	644,238
Less than 12 months, unrealized loss	161,326
More than 12 months, fair value	83,137
More than 12 months, unrealized loss	29,515
Total fair value	727,375
Total unrealized loss	190,841
Corporate bonds and other
AVAILABLE FOR SALE
Less than 12 Months, fair value	53,381	35,597
Less than 12 Months, unrealized loss	2,794	209
More than 12 Months, fair value	0	0
More than 12 Months, unrealized Loss	0	0
Total fair value	53,381	35,597
Total unrealized loss	2,794	209
HELD TO MATURITY
Less than 12 months, fair value	87,630
Less than 12 months, unrealized loss	5,939
More than 12 months, fair value	1,751
More than 12 months, unrealized loss	138
Total fair value	89,381
Total unrealized loss	6,077
Residential
AVAILABLE FOR SALE
Less than 12 Months, fair value	307,521	1,225
Less than 12 Months, unrealized loss	17,084	3
More than 12 Months, fair value	0	5,168
More than 12 Months, unrealized Loss	0	269
Total fair value	307,521	6,393
Total unrealized loss	17,084	272
HELD TO MATURITY
Less than 12 months, fair value	81,422
Less than 12 months, unrealized loss	7,809
More than 12 months, fair value	3,935
More than 12 months, unrealized loss	574
Total fair value	85,357
Total unrealized loss	8,383
Commercial
AVAILABLE FOR SALE
Less than 12 Months, fair value	5,666	4,274
Less than 12 Months, unrealized loss	344	7
More than 12 Months, fair value	2,779	4,674
More than 12 Months, unrealized Loss	759	198
Total fair value	8,445	8,948
Total unrealized loss	1,103	$ 205
HELD TO MATURITY
Less than 12 months, fair value	40,388
Less than 12 months, unrealized loss	2,604
More than 12 months, fair value	0
More than 12 months, unrealized loss	0
Total fair value	40,388
Total unrealized loss	$ 2,604

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