v3.25.3
Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Amortized Cost    
Amortized Cost $ 3,870,870 $ 3,694,578
Fair Value    
Fair Value 3,801,261 3,524,686
Fair Value    
Fair Value 661,923 $ 678,174
Available-for-sale    
Amortized Cost    
Due within one year 0  
Due after one year through five years 0  
Due after five years through ten years 255,563  
Due after ten years 3,615,307  
Amortized Cost 3,870,870  
Fair Value    
Due within one year 0  
Due after one year through five years 0  
Due after five years through ten years 258,015  
Due after ten years 3,543,246  
Fair Value 3,801,261  
Held-to-maturity    
Amortized Cost    
Due within one year 0  
Due after one year through five years 0  
Due after five years through ten years 0  
Due after ten years 743,120  
Amortized Cost 743,120  
Fair Value    
Due within one year 0  
Due after one year through five years 0  
Due after five years through ten years 0  
Due after ten years 661,923  
Fair Value $ 661,923