Securities - Unrealized Loss on Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
AVAILABLE FOR SALE
Less than 12 Months, fair value	$ 1,345,468	$ 311,552
Less than 12 Months, unrealized loss	87,142	3,891
More than 12 Months, fair value	2,926	17,450
More than 12 Months, unrealized Loss	614	1,059
Total fair value	1,348,394	329,002
Total unrealized loss	87,756	4,950
HELD TO MATURITY
Less than 12 months, fair value	922,819
Less than 12 months, unrealized loss	108,717
More than 12 months, fair value	33,233
More than 12 months, unrealized loss	5,385
Total fair value	956,052
Total unrealized loss	114,102
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	1,034,005	260,509
Less than 12 Months, unrealized loss	80,248	3,622
More than 12 Months, fair value	0	7,608
More than 12 Months, unrealized Loss	0	592
Total fair value	1,034,005	268,117
Total unrealized loss	80,248	4,214
HELD TO MATURITY
Less than 12 months, fair value	728,547
Less than 12 months, unrealized loss	103,110
More than 12 months, fair value	28,978
More than 12 months, unrealized loss	5,100
Total fair value	757,525
Total unrealized loss	108,210
Corporate bonds and other
AVAILABLE FOR SALE
Less than 12 Months, fair value	50,788	35,597
Less than 12 Months, unrealized loss	1,462	209
More than 12 Months, fair value	0	0
More than 12 Months, unrealized Loss	0	0
Total fair value	50,788	35,597
Total unrealized loss	1,462	209
HELD TO MATURITY
Less than 12 months, fair value	90,569
Less than 12 months, unrealized loss	2,435
More than 12 months, fair value	0
More than 12 months, unrealized loss	0
Total fair value	90,569
Total unrealized loss	2,435
Residential
AVAILABLE FOR SALE
Less than 12 Months, fair value	254,471	1,225
Less than 12 Months, unrealized loss	5,344	3
More than 12 Months, fair value	0	5,168
More than 12 Months, unrealized Loss	0	269
Total fair value	254,471	6,393
Total unrealized loss	5,344	272
HELD TO MATURITY
Less than 12 months, fair value	58,136
Less than 12 months, unrealized loss	1,988
More than 12 months, fair value	4,255
More than 12 months, unrealized loss	285
Total fair value	62,391
Total unrealized loss	2,273
Commercial
AVAILABLE FOR SALE
Less than 12 Months, fair value	6,204	4,274
Less than 12 Months, unrealized loss	88	7
More than 12 Months, fair value	2,926	4,674
More than 12 Months, unrealized Loss	614	198
Total fair value	9,130	8,948
Total unrealized loss	702	$ 205
HELD TO MATURITY
Less than 12 months, fair value	45,567
Less than 12 months, unrealized loss	1,184
More than 12 months, fair value	0
More than 12 months, unrealized loss	0
Total fair value	45,567
Total unrealized loss	$ 1,184

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