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INVESTMENT SECURITIES - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Held-to-Maturity, Amortized Cost    
Due in one year or less $ 0  
Due after one through five years 0  
Due after five years through ten years 559,346  
Due after ten years 564,479  
Subtotal 1,123,825  
Total - Amortized Cost 1,271,109 $ 1,172,174
Held-to-Maturity, Fair Value    
Due in one year or less 0  
Due after one through five years 0  
Due after five years through ten years 525,818  
Due after ten years 495,965  
Subtotal 1,021,783  
Fair Value 1,167,755 1,121,816
Available-for-Sale, Amortized Cost    
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One 13,680  
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five 1,681,466  
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 485,462  
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 672,434  
Subtotal 2,853,042  
Amortized Cost 3,241,610 3,301,607
Fair Value 2,808,953 2,919,992
Available-for-Sale, Fair Value    
Due in one year or less 13,537  
Due after one through five years 1,519,060  
Due after five years through ten years 427,416  
Due after ten years 520,975  
Subtotal 2,480,988  
Government agency mortgage-backed securities    
Held-to-Maturity, Amortized Cost    
Total - Amortized Cost 147,284 63,073
Held-to-Maturity, Fair Value    
Fair Value 145,972 63,581
Available-for-Sale, Amortized Cost    
Amortized Cost 380,373 400,062
Fair Value 320,295 348,526
Government agency collateralized mortgage obligations    
Held-to-Maturity, Amortized Cost    
Total - Amortized Cost 0  
Held-to-Maturity, Fair Value    
Fair Value 0  
Available-for-Sale, Amortized Cost    
Amortized Cost 8,195 9,498
Fair Value 7,670 8,926
U.S. Treasury and agency securities    
Held-to-Maturity, Amortized Cost    
Total - Amortized Cost 1,123,825 1,109,101
Held-to-Maturity, Fair Value    
Fair Value 1,021,783 1,058,235
Available-for-Sale, Amortized Cost    
Amortized Cost 2,385,193 2,381,168
Fair Value $ 2,056,048 $ 2,080,783