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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Amortized Cost    
Due in one year or less $ 1,759,000  
Due after one year through five years 38,487,000  
Due after five years through ten years 44,078,000  
Due after ten years 135,944,000  
Amortized Cost 754,950,000 $ 801,370,000
Fair Value    
Due in one year or less 1,749,000  
Due after one year through five years 35,227,000  
Due after five years through ten years 40,442,000  
Due after ten years 106,828,000  
Fair Value $ 647,210,000 671,794,000
Weighted Average Yield    
Due in one year or less (in percent) 3.00%  
Due after one year through five years (in percent) 2.77%  
Due after five years through ten years (in percent) 3.10%  
Due after ten years (in percent) 2.81%  
Weighted Average Yield 2.48%  
Amortized Cost    
Due after ten years $ 41,959,000  
Amortized Cost 632,338,000 664,883,000
Fair Value    
Due after ten years 35,253,000  
Total held-to-maturity investment securities $ 565,178,000 596,780,000
Weighted Average Yield    
Due after ten years (in percent) 2.26%  
Total held-to-maturity investment securities 1.95%  
Investments $ 1,387,288,000  
Investment securities $ 1,212,388,000  
Total Investment Securities, Weighted Average Yield 0.0222  
Residential - U.S. Government-sponsored enterprises    
Amortized Cost    
Without single maturity date $ 441,898,000  
Amortized Cost 441,898,000 498,989,000
Fair Value    
Without single maturity date 378,386,000  
Fair Value $ 378,386,000 423,803,000
Weighted Average Yield    
Without single maturity date (in percent) 2.05%  
Amortized Cost    
Without single maturity date $ 590,379,000  
Amortized Cost 590,379,000 623,043,000
Fair Value    
Without single maturity date 529,925,000  
Total held-to-maturity investment securities $ 529,925,000 559,667,000
Weighted Average Yield    
Without single maturity date (in percent) 1.92%  
Residential - Non-Government Agencies    
Amortized Cost    
Without single maturity date $ 19,322,000  
Amortized Cost 19,322,000 9,829,000
Fair Value    
Without single maturity date 18,708,000  
Fair Value $ 18,708,000 8,662,000
Weighted Average Yield    
Without single maturity date (in percent) 4.64%  
Commercial - U.S. Government-sponsored enterprises    
Amortized Cost    
Without single maturity date $ 58,318,000  
Amortized Cost 58,318,000 54,346,000
Fair Value    
Without single maturity date 50,914,000  
Fair Value $ 50,914,000 46,144,000
Weighted Average Yield    
Without single maturity date (in percent) 2.74%  
Commercial - Non-government agencies    
Amortized Cost    
Without single maturity date $ 15,144,000  
Amortized Cost 15,144,000 1,541,000
Fair Value    
Without single maturity date 14,956,000  
Fair Value $ 14,956,000 $ 1,507,000
Weighted Average Yield    
Without single maturity date (in percent) 5.04%