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INVESTMENT SECURITIES - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 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 556,091  
Due after ten years 560,367  
Subtotal 1,116,458  
Total - Amortized Cost 1,217,472 $ 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 527,314  
Due after ten years 503,684  
Subtotal 1,030,998  
Fair Value 1,131,615 1,121,816
Available-for-Sale, Amortized Cost    
Due in one year or less 14,764  
Due after one through five years 1,682,697  
Due after five years through ten years 492,385  
Due after ten years 697,790  
Subtotal 2,887,636  
Amortized Cost 3,287,497 3,301,607
Fair Value 2,863,864 2,919,992
Available-for-Sale, Fair Value    
Due in one year or less 14,603  
Due after one through five years 1,517,578  
Due after five years through ten years 438,082  
Due after ten years 552,843  
Subtotal 2,523,106  
Government agency mortgage-backed securities    
Held-to-Maturity, Amortized Cost    
Total - Amortized Cost 101,014 63,073
Held-to-Maturity, Fair Value    
Fair Value 100,617 63,581
Available-for-Sale, Amortized Cost    
Amortized Cost 391,020 400,062
Fair Value 332,479 348,526
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 8,841 9,498
Fair Value 8,279 8,926
U.S. Treasury and agency securities    
Held-to-Maturity, Amortized Cost    
Total - Amortized Cost 1,116,458 1,109,101
Held-to-Maturity, Fair Value    
Fair Value 1,030,998 1,058,235
Available-for-Sale, Amortized Cost    
Amortized Cost 2,382,653 2,381,168
Fair Value $ 2,055,517 $ 2,080,783