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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Amortized Cost      
Due in one year or less $ 0    
Due after one year through five years 0    
Due after five years through ten years 0    
Due after ten years 41,930    
Amortized Cost 640,053 $ 664,883  
Fair Value      
Due in one year or less 0    
Due after one year through five years 0    
Due after five years through ten years 0    
Due after ten years 32,038    
Total held-to-maturity securities $ 531,887 596,780 $ 673,200
Weighted Average Yield      
Due in one year or less (in percent) 0.00%    
Due after one year through five years (in percent) 0.00%    
Due after give years through ten years (in percent) 0.00%    
Due after ten years (in percent) 2.26%    
Total held-to-maturity securities 1.93%    
Amortized Cost      
Due in one year or less $ 4,496    
Due after one year through five years 38,959    
Due after five years through ten years 49,724    
Due after ten years 131,010    
Amortized Cost 772,369 801,370  
Fair Value      
Due in one year or less 4,470    
Due after one year through five years 34,892    
Due after five years through ten years 43,695    
Due after ten years 93,432    
Fair Value $ 625,253 671,794  
Weighted Average Yield      
Due in one year or less (in percent) 3.15%    
Due after one year through five years (in percent) 2.94%    
Due after five years through ten years (in percent) 2.99%    
Due after ten years (in percent) 2.54%    
Weighted Average Yield 2.35%    
Residential - U.S. Government-sponsored enterprises      
Amortized Cost      
Without single maturity date $ 598,123    
Amortized Cost 598,123 623,043  
Fair Value      
Without single maturity date 499,849    
Total held-to-maturity securities $ 499,849 559,667  
Weighted Average Yield      
Without single maturity date (in percent) 1.91%    
Amortized Cost      
Without single maturity date $ 467,300    
Amortized Cost 467,300 498,989  
Fair Value      
Without single maturity date 378,872    
Fair Value $ 378,872 423,803  
Weighted Average Yield      
Without single maturity date (in percent) 2.01%    
Residential - Non-government agencies      
Amortized Cost      
Without single maturity date $ 13,536    
Amortized Cost 13,536 9,829  
Fair Value      
Without single maturity date 12,079    
Fair Value $ 12,079 8,662  
Weighted Average Yield      
Without single maturity date (in percent) 3.86%    
Commercial - U.S. Government-sponsored enterprises      
Amortized Cost      
Without single maturity date $ 52,263    
Amortized Cost 52,263 54,346  
Fair Value      
Without single maturity date 43,048    
Fair Value $ 43,048 46,144  
Weighted Average Yield      
Without single maturity date (in percent) 2.29%    
Commercial - Non-government agencies      
Amortized Cost      
Without single maturity date $ 15,081    
Amortized Cost 15,081 1,541  
Fair Value      
Without single maturity date 14,765    
Fair Value $ 14,765 $ 1,507  
Weighted Average Yield      
Without single maturity date (in percent) 5.10%