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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Amortized Cost    
Due in one year or less $ 4,287  
Due after one year through five years 58,844  
Due after five years through ten years 58,523  
Due after ten years 121,184  
Amortized Cost 810,765 $ 754,950
Fair Value    
Due in one year or less 4,300  
Due after one year through five years 56,071  
Due after five years through ten years 57,627  
Due after ten years 96,967  
Fair Value $ 723,453 647,210
Weighted Average Yield    
Due in one year or less (in percent) 5.88%  
Due after one year through five years (in percent) 2.78%  
Due after five years through ten years (in percent) 3.92%  
Due after ten years (in percent) 2.43%  
Weighted Average Yield 2.67%  
Amortized Cost    
Due after ten years $ 42,013  
Amortized Cost 606,117 632,338
Fair Value    
Due after ten years 34,730  
Total held-to-maturity securities $ 546,990 565,178
Weighted Average Yield    
Due after ten years (in percent) 2.26%  
Total held-to-maturity securities 1.92%  
Residential - U.S. government-sponsored entities and agencies    
Amortized Cost    
Without single maturity date $ 433,493  
Amortized Cost 433,493 441,898
Fair Value    
Without single maturity date 386,296  
Fair Value $ 386,296 378,386
Weighted Average Yield    
Without single maturity date (in percent) 2.27%  
Amortized Cost    
Without single maturity date $ 564,104  
Amortized Cost 564,104 590,379
Fair Value    
Without single maturity date 512,260  
Total held-to-maturity securities $ 512,260 529,925
Weighted Average Yield    
Without single maturity date (in percent) 1.90%  
Residential - Non-government agencies    
Amortized Cost    
Without single maturity date $ 18,085  
Amortized Cost 18,085 19,322
Fair Value    
Without single maturity date 17,834  
Fair Value $ 17,834 18,708
Weighted Average Yield    
Without single maturity date (in percent) 5.59%  
Commercial - U.S. government-sponsored entities and agencies    
Amortized Cost    
Without single maturity date $ 101,018  
Amortized Cost 101,018 58,318
Fair Value    
Without single maturity date 89,029  
Fair Value $ 89,029 50,914
Weighted Average Yield    
Without single maturity date (in percent) 2.73%  
Commercial - Non-government agencies    
Amortized Cost    
Without single maturity date $ 15,331  
Amortized Cost 15,331 15,144
Fair Value    
Without single maturity date 15,329  
Fair Value $ 15,329 $ 14,956
Weighted Average Yield    
Without single maturity date (in percent) 4.55%