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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Amortized Cost    
Due in one year or less $ 1,361  
Due after one year through five years 53,764  
Due after five years through ten years 63,131  
Due after ten years 124,669  
Amortized Cost 791,122 $ 754,950
Fair Value    
Due in one year or less 1,357  
Due after one year through five years 49,405  
Due after five years through ten years 60,566  
Due after ten years 95,341  
Fair Value $ 676,719 647,210
Weighted Average Yield    
Due in one year or less (in percent) 2.67%  
Due after one year through five years (in percent) 2.74%  
Due after five years through ten years (in percent) 4.00%  
Due after ten years (in percent) 2.44%  
Weighted Average Yield 2.63%  
Amortized Cost    
Due after ten years $ 42,002  
Amortized Cost 615,867 632,338
Fair Value    
Due after ten years 33,864  
Total held-to-maturity securities $ 528,088 565,178
Weighted Average Yield    
Due after ten years (in percent) 2.26%  
Total held-to-maturity securities 1.94%  
Residential - U.S. government-sponsored entities and agencies    
Amortized Cost    
Without single maturity date $ 416,128  
Amortized Cost 416,128 441,898
Fair Value    
Without single maturity date 353,954  
Fair Value $ 353,954 378,386
Weighted Average Yield    
Without single maturity date (in percent) 2.21%  
Amortized Cost    
Without single maturity date $ 573,865  
Amortized Cost 573,865 590,379
Fair Value    
Without single maturity date 494,224  
Total held-to-maturity securities $ 494,224 529,925
Weighted Average Yield    
Without single maturity date (in percent) 1.92%  
Residential - Non-government agencies    
Amortized Cost    
Without single maturity date $ 18,454  
Amortized Cost 18,454 19,322
Fair Value    
Without single maturity date 17,448  
Fair Value $ 17,448 18,708
Weighted Average Yield    
Without single maturity date (in percent) 4.56%  
Commercial - U.S. government-sponsored entities and agencies    
Amortized Cost    
Without single maturity date $ 98,346  
Amortized Cost 98,346 58,318
Fair Value    
Without single maturity date 83,512  
Fair Value $ 83,512 50,914
Weighted Average Yield    
Without single maturity date (in percent) 2.75%  
Commercial - Non-government agencies    
Amortized Cost    
Without single maturity date $ 15,269  
Amortized Cost 15,269 15,144
Fair Value    
Without single maturity date 15,136  
Fair Value $ 15,136 $ 14,956
Weighted Average Yield    
Without single maturity date (in percent) 5.07%