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Securities - Unrealized Loss on Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
AVAILABLE FOR SALE
Less than 12 Months, fair value	$ 64,783	$ 741,134
Less than 12 Months, unrealized loss	260	6,626
More than 12 Months, fair value	216,944	437,932
More than 12 Months, unrealized Loss	28,218	48,106
Total fair value	281,727	1,179,066
Total unrealized loss	28,478	54,732
HELD TO MATURITY
Less than 12 months, fair value	130,313	78,032
Less than 12 months, unrealized loss	5,700	2,220
More than 12 months, fair value	899,756	916,604
More than 12 months, unrealized loss	153,023	167,561
Total fair value	1,030,069	994,636
Total unrealized loss	158,723	169,781
State and political subdivisions
AVAILABLE FOR SALE
Less than 12 Months, fair value	0	12,089
Less than 12 Months, unrealized loss	0	64
More than 12 Months, fair value	200,368	398,304
More than 12 Months, unrealized Loss	27,246	43,653
Total fair value	200,368	410,393
Total unrealized loss	27,246	43,717
HELD TO MATURITY
Less than 12 months, fair value	127,853	73,272
Less than 12 months, unrealized loss	5,503	1,779
More than 12 months, fair value	716,470	704,563
More than 12 months, unrealized loss	143,873	150,918
Total fair value	844,323	777,835
Total unrealized loss	149,376	152,697
Corporate bonds and other
AVAILABLE FOR SALE
Less than 12 Months, fair value	0	2,967
Less than 12 Months, unrealized loss	0	33
More than 12 Months, fair value	5,748	5,612
More than 12 Months, unrealized Loss	234	368
Total fair value	5,748	8,579
Total unrealized loss	234	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	84,432	111,392
More than 12 months, unrealized loss	2,716	6,404
Total fair value	84,432	113,604
Total unrealized loss	2,716	6,553
Residential
AVAILABLE FOR SALE
Less than 12 Months, fair value	64,783	723,855
Less than 12 Months, unrealized loss	260	6,517
More than 12 Months, fair value	10,828	31,527
More than 12 Months, unrealized Loss	738	3,571
Total fair value	75,611	755,382
Total unrealized loss	998	10,088
HELD TO MATURITY
Less than 12 months, fair value	2,460	2,548
Less than 12 months, unrealized loss	197	292
More than 12 months, fair value	71,055	73,064
More than 12 months, unrealized loss	5,219	8,257
Total fair value	73,515	75,612
Total unrealized loss	5,416	8,549
Commercial
AVAILABLE FOR SALE
Less than 12 Months, fair value		2,223
Less than 12 Months, unrealized loss		12
More than 12 Months, fair value		2,489
More than 12 Months, unrealized Loss		514
Total fair value		4,712
Total unrealized loss		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	27,799	27,585
More than 12 months, unrealized loss	1,215	1,982
Total fair value	27,799	27,585
Total unrealized loss	$ 1,215	$ 1,982

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