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INVESTMENT SECURITIES (Unrealized Gains and Losses by Category) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Securities Available-for-Sale, Amortized Cost    
12 months or more $ 95,495  
Less than 12 months 775,763 $ 98,962
Total 871,258  
Securities Available-for-Sale, Unrealized Loss    
12 months or more 10,140  
Less than 12 months 14,284 3,400
Total 24,424  
Securities Available-for-Sale, Fair Value    
12 months or more 85,355 0
Less than 12 months 761,479 95,562
Total 846,834  
CMOs issued by US Government-sponsored agencies    
Securities Available-for-Sale, Amortized Cost    
Less than 12 months 20,744 500
Total 20,744  
Securities Available-for-Sale, Unrealized Loss    
Less than 12 months 328 1
Total 328  
Securities Available-for-Sale, Fair Value    
Less than 12 months 20,416 499
Total 20,416  
FNMA and FHLMC certificates    
Securities Available-for-Sale, Amortized Cost    
12 months or more 91,258  
Less than 12 months 481,614 93,440
Total 572,872  
Held-to-Maturity, Amortized Cost    
Less than 12 months 359,806 367,507
Total 359,806  
Securities Available-for-Sale, Unrealized Loss    
12 months or more 9,884  
Less than 12 months 5,518 3,200
Total 15,402  
Held-to-Maturity, Unrealized Loss    
Less than 12 months 29,837 3,854
Total 29,837  
Securities Available-for-Sale, Fair Value    
12 months or more 81,374  
Less than 12 months 476,096 90,240
Total 557,470  
Held-to-Maturity, Fair Value    
Fair Value 329,969 363,653
Total 329,969  
GNMA Securities    
Securities Available-for-Sale, Amortized Cost    
12 months or more 4,237  
Less than 12 months 273,405 5,022
Total 277,642  
Securities Available-for-Sale, Unrealized Loss    
12 months or more 256  
Less than 12 months 8,438 199
Total 8,694  
Securities Available-for-Sale, Fair Value    
12 months or more 3,981  
Less than 12 months 264,967 $ 4,823
Total $ 268,948