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INVESTMENT SECURITIES - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
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 552,838  
Due after ten years 556,263  
Subtotal 1,109,101  
Total - Amortized Cost 1,172,174 $ 1,079,695
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 536,885  
Due after ten years 521,350  
Subtotal 1,058,235  
Fair Value 1,121,816 1,034,795
Available-for-Sale, Amortized Cost    
Due in one year or less 16,671  
Due after one through five years 1,583,809  
Due after five years through ten years 579,092  
Due after ten years 712,475  
Subtotal 2,892,047  
Amortized Cost 3,301,607 4,675,474
Debt Securities, Available-for-Sale, Excluding Accrued Interest 2,919,992 4,151,851
Available-for-Sale, Fair Value    
Due in one year or less 16,566  
Due after one through five years 1,441,328  
Due after five years through ten years 523,830  
Due after ten years 580,816  
Subtotal 2,562,540  
Government agency mortgage-backed securities    
Held-to-Maturity, Amortized Cost    
Total - Amortized Cost 63,073 0
Held-to-Maturity, Fair Value    
Fair Value 63,581 0
Available-for-Sale, Amortized Cost    
Amortized Cost 400,062 444,689
Debt Securities, Available-for-Sale, Excluding Accrued Interest 348,526 384,633
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 9,498 13,121
Debt Securities, Available-for-Sale, Excluding Accrued Interest 8,926 12,270
U.S. Treasury and agency securities    
Held-to-Maturity, Amortized Cost    
Total - Amortized Cost 1,109,101 1,079,695
Held-to-Maturity, Fair Value    
Fair Value 1,058,235 1,034,795
Available-for-Sale, Amortized Cost    
Amortized Cost 2,381,168 3,660,546
Debt Securities, Available-for-Sale, Excluding Accrued Interest $ 2,080,783 $ 3,243,537