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INVESTMENT SECURITIES - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 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 565,934  
Due after ten years 572,809  
Subtotal 1,138,743  
Total - Amortized Cost 1,345,155 $ 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 530,096  
Due after ten years 485,453  
Subtotal 1,015,549  
Fair Value 1,220,168 1,121,816
Available-for-Sale, Amortized Cost    
Due in one year or less 9,386  
Due after one through five years 1,952,103  
Due after five years through ten years 303,068  
Due after ten years 560,855  
Subtotal 2,825,412  
Amortized Cost 3,192,392 3,301,607
Fair Value 2,785,714 2,919,992
Available-for-Sale, Fair Value    
Due in one year or less 9,333  
Due after one through five years 1,788,434  
Due after five years through ten years 257,109  
Due after ten years 423,102  
Subtotal 2,477,978  
Government agency mortgage-backed securities    
Held-to-Maturity, Amortized Cost    
Total - Amortized Cost 206,412 63,073
Held-to-Maturity, Fair Value    
Fair Value 204,619 63,581
Available-for-Sale, Amortized Cost    
Amortized Cost 360,102 400,062
Fair Value 301,224 348,526
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 6,878 9,498
Fair Value 6,512 8,926
U.S. Treasury and agency securities    
Held-to-Maturity, Amortized Cost    
Total - Amortized Cost 1,138,743 1,109,101
Held-to-Maturity, Fair Value    
Fair Value 1,015,549 1,058,235
Available-for-Sale, Amortized Cost    
Amortized Cost 2,389,208 2,381,168
Fair Value $ 2,083,786 $ 2,080,783