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SECURITIES - Unrealized Loss Analysis on Available-for-Sale and Held-to-Maturity Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities    
Less than 12 months, fair value $ 1,066,966 $ 496,891
12 months or more, fair value 146,940 51,468
Total fair value 1,213,906 548,359
Less than 12 months, unrealized losses 149,243 6,714
12 Months or more, unrealized losses 27,245 1,941
Total unrealized losses 176,488 8,655
U.S. Treasury securities    
Schedule of Available-for-sale Securities    
Less than 12 months, fair value 2,234  
12 months or more, fair value 0  
Total fair value 2,234  
Less than 12 months, unrealized losses 15  
12 Months or more, unrealized losses 0  
Total unrealized losses 15  
U.S. government sponsored agencies    
Schedule of Available-for-sale Securities    
Less than 12 months, fair value 106,954 85,968
12 months or more, fair value 35,307 28,676
Total fair value 142,261 114,644
Less than 12 months, unrealized losses 13,796 1,364
12 Months or more, unrealized losses 5,530 1,081
Total unrealized losses 19,326 2,445
Mortgage-backed securities: residential    
Schedule of Available-for-sale Securities    
Less than 12 months, fair value 447,418 272,264
12 months or more, fair value 100,785 22,792
Total fair value 548,203 295,056
Less than 12 months, unrealized losses 43,772 4,076
12 Months or more, unrealized losses 18,018 860
Total unrealized losses 61,790 4,936
State and municipal securities    
Schedule of Available-for-sale Securities    
Less than 12 months, fair value 510,360 138,659
12 months or more, fair value 10,848 0
Total fair value 521,208 138,659
Less than 12 months, unrealized losses 91,660 1,274
12 Months or more, unrealized losses 3,697 0
Total unrealized losses 95,357 $ 1,274
Schedule of Held-to-Maturity Securities    
Less than 12 months, fair value 113,350  
12 months or more, fair value 0  
Total fair value 113,350  
Less than 12 months, unrealized losses 14,061  
12 Months or more, unrealized losses 0  
Total unrealized losses $ 14,061