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Securities - Unrealized Loss on Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
AVAILABLE FOR SALE
Less than 12 Months, fair value	$ 321,043	$ 1,174,855
Less than 12 Months, unrealized loss	7,217	82,638
More than 12 Months, fair value	697,645	29,165
More than 12 Months, unrealized Loss	57,207	7,504
Total fair value	1,018,688	1,204,020
Total unrealized loss	64,424	90,142
HELD TO MATURITY
Less than 12 months, fair value	298,906	672,739
Less than 12 months, unrealized loss	14,727	83,876
More than 12 months, fair value	675,086	340,055
More than 12 months, unrealized loss	130,444	98,262
Total fair value	973,992	1,012,794
Total unrealized loss	145,171	182,138
State and political subdivisions
AVAILABLE FOR SALE
Less than 12 Months, fair value	152,248	859,270
Less than 12 Months, unrealized loss	2,179	68,683
More than 12 Months, fair value	625,144	26,620
More than 12 Months, unrealized Loss	52,194	6,874
Total fair value	777,392	885,890
Total unrealized loss	54,373	75,557
HELD TO MATURITY
Less than 12 months, fair value	182,401	426,382
Less than 12 months, unrealized loss	7,385	66,898
More than 12 months, fair value	544,200	323,385
More than 12 months, unrealized loss	119,561	96,385
Total fair value	726,601	749,767
Total unrealized loss	126,946	163,283
Corporate bonds and other
AVAILABLE FOR SALE
Less than 12 Months, fair value	13,193	3,678
Less than 12 Months, unrealized loss	1,135	14
More than 12 Months, fair value	0	0
More than 12 Months, unrealized Loss	0	0
Total fair value	13,193	3,678
Total unrealized loss	1,135	14
HELD TO MATURITY
Less than 12 months, fair value	95,612	125,250
Less than 12 months, unrealized loss	6,228	6,660
More than 12 months, fair value	36,668	12,738
More than 12 months, unrealized loss	3,593	1,333
Total fair value	132,280	137,988
Total unrealized loss	9,821	7,993
Residential
AVAILABLE FOR SALE
Less than 12 Months, fair value	155,602	306,294
Less than 12 Months, unrealized loss	3,903	13,623
More than 12 Months, fair value	64,334	0
More than 12 Months, unrealized Loss	4,089	0
Total fair value	219,936	306,294
Total unrealized loss	7,992	13,623
HELD TO MATURITY
Less than 12 months, fair value	20,893	80,801
Less than 12 months, unrealized loss	1,114	7,799
More than 12 months, fair value	65,539	3,932
More than 12 months, unrealized loss	5,168	544
Total fair value	86,432	84,733
Total unrealized loss	6,282	8,343
Commercial
AVAILABLE FOR SALE
Less than 12 Months, fair value	0	5,613
Less than 12 Months, unrealized loss	0	318
More than 12 Months, fair value	8,167	2,545
More than 12 Months, unrealized Loss	924	630
Total fair value	8,167	8,158
Total unrealized loss	924	948
HELD TO MATURITY
Less than 12 months, fair value	0	40,306
Less than 12 months, unrealized loss	0	2,519
More than 12 months, fair value	28,679	0
More than 12 months, unrealized loss	2,122	0
Total fair value	28,679	40,306
Total unrealized loss	$ 2,122	$ 2,519

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