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Investment Securities - Amortized Cost and Estimated Fair Value of Securities Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Amortized Cost    
Due in one year or less, Amortized Cost $ 29,837  
Due in one year or less, Amortized Cost 0  
Due after one year through five years, Amortized Cost 256,357  
Due after one year through five years, Amortized Cost 43,548  
Due after five years through ten years, Amortized Cost 377,774  
Due after five years through ten years, Amortized Cost 341,352  
Due after ten years, Amortized Cost 839,514  
Due after ten years, Amortized Cost 768,275  
Amortized Cost 3,529,325 $ 3,840,927
Amortized Cost 1,279,095 1,283,987
Estimated Fair Value    
Due in one year or less, Estimated Fair Value 29,449  
Due in one year or less, Estimated Fair Value 0  
Due after one year through five years, Estimated Fair Value 245,060  
Due after one year through five years, Estimated Fair Value 42,380  
Due after five years through ten years, Estimated Fair Value 346,905  
Due after five years through ten years, Estimated Fair Value 321,196  
Due after ten years, Estimated Fair Value 783,602  
Due after ten years, Estimated Fair Value 706,493  
Total, Estimated Fair Value 3,270,620 3,507,841
Estimated Fair Value 1,194,455 1,170,481
U.S. government-sponsored mortgage-backed securities    
Amortized Cost    
Securities not due at a single maturity date, Amortized Cost 1,574,430  
Securities not due at a single maturity date, Amortized Cost 125,920  
Amortized Cost 1,574,430 1,711,668
Amortized Cost 125,920 130,278
Estimated Fair Value    
Securities not due at a single maturity date, Estimated Fair Value 1,425,465  
Securities not due at a single maturity date, Estimated Fair Value 124,386  
Total, Estimated Fair Value 1,425,465 1,520,421
Estimated Fair Value 124,386 126,022
Private mortgage-backed securities    
Amortized Cost    
Securities not due at a single maturity date, Amortized Cost 186,916  
Securities not due at a single maturity date, Amortized Cost 0  
Amortized Cost 186,916 191,522
Estimated Fair Value    
Securities not due at a single maturity date, Estimated Fair Value 177,941  
Securities not due at a single maturity date, Estimated Fair Value 0  
Total, Estimated Fair Value 177,941 175,405
Non-government-sponsored asset backed securities    
Amortized Cost    
Securities not due at a single maturity date, Amortized Cost 264,497  
Securities not due at a single maturity date, Amortized Cost 0  
Amortized Cost 264,497 370,203
Estimated Fair Value    
Securities not due at a single maturity date, Estimated Fair Value 262,198  
Securities not due at a single maturity date, Estimated Fair Value 0  
Total, Estimated Fair Value $ 262,198 $ 363,473