Securities - Unrealized Loss on Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
AVAILABLE FOR SALE
Less than 12 Months, fair value	$ 1,488,542	$ 55,764
Less than 12 Months, unrealized loss	60,644	74
More than 12 Months, fair value	126,951	143,986
More than 12 Months, unrealized Loss	32,889	17,788
Total fair value	1,615,493	199,750
Total unrealized loss	93,533	17,862
HELD TO MATURITY
Less than 12 months, fair value	54,900	20,224
Less than 12 months, unrealized loss	6,151	3,128
More than 12 months, fair value	869,635	933,774
More than 12 months, unrealized loss	240,984	144,064
Total fair value	924,535	953,998
Total unrealized loss	247,135	147,192
State and political subdivisions
AVAILABLE FOR SALE
Less than 12 Months, fair value	43,927	0
Less than 12 Months, unrealized loss	1,230	0
More than 12 Months, fair value	113,272	128,723
More than 12 Months, unrealized Loss	31,706	17,055
Total fair value	157,199	128,723
Total unrealized loss	32,936	17,055
HELD TO MATURITY
Less than 12 months, fair value	48,633	20,224
Less than 12 months, unrealized loss	6,072	3,128
More than 12 months, fair value	756,522	770,244
More than 12 months, unrealized loss	230,640	136,591
Total fair value	805,155	790,468
Total unrealized loss	236,712	139,719
Corporate bonds and other
AVAILABLE FOR SALE
Less than 12 Months, fair value	33,775	3,708
Less than 12 Months, unrealized loss	226	42
More than 12 Months, fair value	4,862	4,943
More than 12 Months, unrealized Loss	138	57
Total fair value	38,637	8,651
Total unrealized loss	364	99
HELD TO MATURITY
Less than 12 months, fair value	6,032	0
Less than 12 months, unrealized loss	78	0
More than 12 months, fair value	43,314	64,009
More than 12 months, unrealized loss	1,030	1,487
Total fair value	49,346	64,009
Total unrealized loss	1,108	1,487
Residential
AVAILABLE FOR SALE
Less than 12 Months, fair value	1,410,840	52,056
Less than 12 Months, unrealized loss	59,188	32
More than 12 Months, fair value	8,817	10,320
More than 12 Months, unrealized Loss	1,045	676
Total fair value	1,419,657	62,376
Total unrealized loss	60,233	708
HELD TO MATURITY
Less than 12 months, fair value	235	0
Less than 12 months, unrealized loss	1	0
More than 12 months, fair value	62,405	71,782
More than 12 months, unrealized loss	8,012	4,898
Total fair value	62,640	71,782
Total unrealized loss	8,013	4,898
Commercial
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	7,394	27,739
More than 12 months, unrealized loss	1,302	1,088
Total fair value	7,394	27,739
Total unrealized loss	$ 1,302	$ 1,088

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