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SECURITIES - Unrealized Loss Analysis on Available-for-Sale and Held-to-Maturity Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Schedule of Available-for-sale Securities    
Less than 12 months, fair value $ 78,836 $ 455,318
12 months or more, fair value 1,002,770 686,704
Total fair value 1,081,606 1,142,022
Less than 12 months, unrealized losses 2,557 53,415
12 Months or more, unrealized losses 186,097 162,064
Total unrealized losses 188,654 215,479
U.S. Treasury securities    
Schedule of Available-for-sale Securities    
Less than 12 months, fair value 1,373 3,034
12 months or more, fair value 791 0
Total fair value 2,164 3,034
Less than 12 months, unrealized losses 6 23
12 Months or more, unrealized losses 7 0
Total unrealized losses 13 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 127,995 118,541
Total fair value 127,995 126,961
Less than 12 months, unrealized losses 0 1,350
12 Months or more, unrealized losses 25,933 27,873
Total unrealized losses 25,933 29,223
Mortgage-backed securities: residential    
Schedule of Available-for-sale Securities    
Less than 12 months, fair value 29,080 165,897
12 months or more, fair value 452,186 323,727
Total fair value 481,266 489,624
Less than 12 months, unrealized losses 1,120 18,637
12 Months or more, unrealized losses 76,364 67,297
Total unrealized losses 77,484 85,934
State and municipal securities    
Schedule of Available-for-sale Securities    
Less than 12 months, fair value 48,383 277,967
12 months or more, fair value 421,798 244,436
Total fair value 470,181 522,403
Less than 12 months, unrealized losses 1,431 33,405
12 Months or more, unrealized losses 83,793 66,894
Total unrealized losses 85,224 100,299
Schedule of Held-to-Maturity Securities    
Less than 12 months, fair value 0 0
12 months or more, fair value 115,533 111,029
Total fair value 115,533 111,029
Less than 12 months, unrealized losses 0 0
12 Months or more, unrealized losses 13,118 17,213
Total unrealized losses $ 13,118 $ 17,213