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SECURITIES - Unrealized Loss Analysis on Available-for-Sale and Held-to-Maturity Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Schedule of Available-for-sale Securities |  |
Less than 12 months, fair value | $ 32,146 | $ 455,318
12 months or more, fair value | 939,071 | 686,704
Total fair value | 971,217 | 1,142,022
Less than 12 months, unrealized losses | 2,301 | 53,415
12 Months or more, unrealized losses | 264,101 | 162,064
Total unrealized losses | 266,402 | 215,479
U.S. Treasury securities |  |
Schedule of Available-for-sale Securities |  |
Less than 12 months, fair value | 2,466 | 3,034
12 months or more, fair value | 395 | 0
Total fair value | 2,861 | 3,034
Less than 12 months, unrealized losses | 8 | 23
12 Months or more, unrealized losses | 4 | 0
Total unrealized losses | 12 | 23
U.S. government sponsored agencies |  |
Schedule of Available-for-sale Securities |  |
Less than 12 months, fair value | 0 | 8,420
12 months or more, fair value | 115,671 | 118,541
Total fair value | 115,671 | 126,961
Less than 12 months, unrealized losses | 0 | 1,350
12 Months or more, unrealized losses | 33,224 | 27,873
Total unrealized losses | 33,224 | 29,223
Mortgage-backed securities: residential |  |
Schedule of Available-for-sale Securities |  |
Less than 12 months, fair value | 3,596 | 165,897
12 months or more, fair value | 425,212 | 323,727
Total fair value | 428,808 | 489,624
Less than 12 months, unrealized losses | 187 | 18,637
12 Months or more, unrealized losses | 101,970 | 67,297
Total unrealized losses | 102,157 | 85,934
State and municipal securities |  |
Schedule of Available-for-sale Securities |  |
Less than 12 months, fair value | 26,084 | 277,967
12 months or more, fair value | 397,793 | 244,436
Total fair value | 423,877 | 522,403
Less than 12 months, unrealized losses | 2,106 | 33,405
12 Months or more, unrealized losses | 128,903 | 66,894
Total unrealized losses | $ 131,009 | $ 100,299

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