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Securities - Unrealized Loss on Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
AVAILABLE FOR SALE
Less than 12 Months, fair value	$ 181,342	$ 741,134
Less than 12 Months, unrealized loss	1,414	6,626
More than 12 Months, fair value	424,619	437,932
More than 12 Months, unrealized Loss	56,986	48,106
Total fair value	605,961	1,179,066
Total unrealized loss	58,400	54,732
HELD TO MATURITY
Less than 12 months, fair value	133,992	78,032
Less than 12 months, unrealized loss	3,498	2,220
More than 12 months, fair value	922,465	916,604
More than 12 months, unrealized loss	166,844	167,561
Total fair value	1,056,457	994,636
Total unrealized loss	170,342	169,781
State and political subdivisions
AVAILABLE FOR SALE
Less than 12 Months, fair value	12,703	12,089
Less than 12 Months, unrealized loss	163	64
More than 12 Months, fair value	385,424	398,304
More than 12 Months, unrealized Loss	53,302	43,653
Total fair value	398,127	410,393
Total unrealized loss	53,465	43,717
HELD TO MATURITY
Less than 12 months, fair value	131,425	73,272
Less than 12 months, unrealized loss	3,273	1,779
More than 12 months, fair value	717,769	704,563
More than 12 months, unrealized loss	153,077	150,918
Total fair value	849,194	777,835
Total unrealized loss	156,350	152,697
Corporate bonds and other
AVAILABLE FOR SALE
Less than 12 Months, fair value	2,802	2,967
Less than 12 Months, unrealized loss	199	33
More than 12 Months, fair value	5,672	5,612
More than 12 Months, unrealized Loss	309	368
Total fair value	8,474	8,579
Total unrealized loss	508	401
HELD TO MATURITY
Less than 12 months, fair value	0	2,212
Less than 12 months, unrealized loss	0	149
More than 12 months, fair value	103,289	111,392
More than 12 months, unrealized loss	5,763	6,404
Total fair value	103,289	113,604
Total unrealized loss	5,763	6,553
Residential
AVAILABLE FOR SALE
Less than 12 Months, fair value	165,837	723,855
Less than 12 Months, unrealized loss	1,052	6,517
More than 12 Months, fair value	30,986	31,527
More than 12 Months, unrealized Loss	2,926	3,571
Total fair value	196,823	755,382
Total unrealized loss	3,978	10,088
HELD TO MATURITY
Less than 12 months, fair value	2,567	2,548
Less than 12 months, unrealized loss	225	292
More than 12 months, fair value	73,610	73,064
More than 12 months, unrealized loss	6,421	8,257
Total fair value	76,177	75,612
Total unrealized loss	6,646	8,549
Commercial
AVAILABLE FOR SALE
Less than 12 Months, fair value	0	2,223
Less than 12 Months, unrealized loss	0	12
More than 12 Months, fair value	2,537	2,489
More than 12 Months, unrealized Loss	449	514
Total fair value	2,537	4,712
Total unrealized loss	449	526
HELD TO MATURITY
Less than 12 months, fair value	0	0
Less than 12 months, unrealized loss	0	0
More than 12 months, fair value	27,797	27,585
More than 12 months, unrealized loss	1,583	1,982
Total fair value	27,797	27,585
Total unrealized loss	$ 1,583	$ 1,982

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