SECURITIES - Unrealized Loss Analysis on Available-for-Sale and Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities
Less than 12 months, fair value	$ 19,680	$ 31,397
12 months or more, fair value	984,431	1,002,690
Total fair value	1,004,111	1,034,087
Less than 12 months, unrealized losses	441	440
12 Months or more, unrealized losses	189,600	174,334
Total unrealized losses	190,041	174,774
U.S. government sponsored agencies
Schedule of Available-for-sale Securities
Less than 12 months, fair value	0	0
12 months or more, fair value	116,452	119,479
Total fair value	116,452	119,479
Less than 12 months, unrealized losses	0	0
12 Months or more, unrealized losses	28,241	27,213
Total unrealized losses	28,241	27,213
Mortgage-backed securities: residential
Schedule of Available-for-sale Securities
Less than 12 months, fair value	1,325	52
12 months or more, fair value	427,086	442,765
Total fair value	428,411	442,817
Less than 12 months, unrealized losses	11	0
12 Months or more, unrealized losses	79,094	74,551
Total unrealized losses	79,105	74,551
State and municipal securities
Schedule of Available-for-sale Securities
Less than 12 months, fair value	18,355	31,345
12 months or more, fair value	440,893	440,446
Total fair value	459,248	471,791
Less than 12 months, unrealized losses	430	440
12 Months or more, unrealized losses	82,265	72,570
Total unrealized losses	$ 82,695	$ 73,010