Securities - Unrealized Loss on Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
AVAILABLE FOR SALE
Less than 12 Months, fair value	$ 399,134	$ 185,339
Less than 12 Months, unrealized loss	1,180	1,165
More than 12 Months, fair value	571,111	560,939
More than 12 Months, unrealized Loss	50,448	38,666
Total fair value	970,245	746,278
Total unrealized loss	51,628	39,831
HELD TO MATURITY
Less than 12 months, fair value	37,730	26,505
Less than 12 months, unrealized loss	688	1,258
More than 12 months, fair value	946,278	939,087
More than 12 months, unrealized loss	161,128	150,204
Total fair value	984,008	965,592
Total unrealized loss	161,816	151,462
US Treasury Securities
AVAILABLE FOR SALE
Less than 12 Months, fair value	139,186
Less than 12 Months, unrealized loss	19
More than 12 Months, fair value	0
More than 12 Months, unrealized Loss	0
Total fair value	139,186
Total unrealized loss	19
State and political subdivisions
AVAILABLE FOR SALE
Less than 12 Months, fair value	7,464	26,371
Less than 12 Months, unrealized loss	73	297
More than 12 Months, fair value	524,101	516,520
More than 12 Months, unrealized Loss	45,957	35,233
Total fair value	531,565	542,891
Total unrealized loss	46,030	35,530
HELD TO MATURITY
Less than 12 months, fair value	35,016	16,549
Less than 12 months, unrealized loss	563	123
More than 12 months, fair value	711,680	713,499
More than 12 months, unrealized loss	137,471	126,110
Total fair value	746,696	730,048
Total unrealized loss	138,034	126,233
Corporate bonds and other
AVAILABLE FOR SALE
Less than 12 Months, fair value	3,450	8,103
Less than 12 Months, unrealized loss	108	319
More than 12 Months, fair value	9,332	5,071
More than 12 Months, unrealized Loss	807	188
Total fair value	12,782	13,174
Total unrealized loss	915	507
HELD TO MATURITY
Less than 12 months, fair value	2,714	9,956
Less than 12 months, unrealized loss	125	1,135
More than 12 months, fair value	126,059	114,787
More than 12 months, unrealized loss	12,722	14,603
Total fair value	128,773	124,743
Total unrealized loss	12,847	15,738
Residential
AVAILABLE FOR SALE
Less than 12 Months, fair value	249,034	150,865
Less than 12 Months, unrealized loss	980	549
More than 12 Months, fair value	35,223	36,864
More than 12 Months, unrealized Loss	3,128	2,709
Total fair value	284,257	187,729
Total unrealized loss	4,108	3,258
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	80,792	82,747
More than 12 months, unrealized loss	8,578	7,263
Total fair value	80,792	82,747
Total unrealized loss	8,578	7,263
Commercial
AVAILABLE FOR SALE
Less than 12 Months, fair value	0	0
Less than 12 Months, unrealized loss	0	0
More than 12 Months, fair value	2,455	2,484
More than 12 Months, unrealized Loss	556	536
Total fair value	2,455	2,484
Total unrealized loss	556	536
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	27,747	28,054
More than 12 months, unrealized loss	2,357	2,228
Total fair value	27,747	28,054
Total unrealized loss	$ 2,357	$ 2,228

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