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Investment Securities - Amortized Cost and Estimated Fair Value of Securities Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Amortized Cost    
Due in one year or less, Amortized Cost $ 21,983  
Due in one year or less, Amortized Cost 0  
Due after one year through five years, Amortized Cost 242,321  
Due after one year through five years, Amortized Cost 32,900  
Due after five years through ten years, Amortized Cost 406,876  
Due after five years through ten years, Amortized Cost 319,351  
Due after ten years, Amortized Cost 851,977  
Due after ten years, Amortized Cost 801,143  
Amortized Cost 3,691,868 $ 3,840,927
Amortized Cost 1,280,858 1,283,987
Estimated Fair Value    
Due in one year or less, Estimated Fair Value 21,854  
Due in one year or less, Estimated Fair Value 0  
Due after one year through five years, Estimated Fair Value 226,640  
Due after one year through five years, Estimated Fair Value 30,933  
Due after five years through ten years, Estimated Fair Value 364,876  
Due after five years through ten years, Estimated Fair Value 289,436  
Due after ten years, Estimated Fair Value 783,762  
Due after ten years, Estimated Fair Value 717,364  
Total, Estimated Fair Value 3,344,539 3,507,841
Estimated Fair Value 1,159,160 1,170,481
U.S. government-sponsored mortgage-backed securities    
Amortized Cost    
Securities not due at a single maturity date, Amortized Cost 1,621,192  
Securities not due at a single maturity date, Amortized Cost 127,464  
Amortized Cost 1,621,192 1,711,668
Amortized Cost 127,464 130,278
Estimated Fair Value    
Securities not due at a single maturity date, Estimated Fair Value 1,420,475  
Securities not due at a single maturity date, Estimated Fair Value 121,427  
Total, Estimated Fair Value 1,420,475 1,520,421
Estimated Fair Value 121,427 126,022
Private mortgage-backed securities    
Amortized Cost    
Securities not due at a single maturity date, Amortized Cost 188,551  
Securities not due at a single maturity date, Amortized Cost 0  
Amortized Cost 188,551 191,522
Estimated Fair Value    
Securities not due at a single maturity date, Estimated Fair Value 173,133  
Securities not due at a single maturity date, Estimated Fair Value 0  
Total, Estimated Fair Value 173,133 175,405
Non-government-sponsored asset backed securities    
Amortized Cost    
Securities not due at a single maturity date, Amortized Cost 358,968  
Securities not due at a single maturity date, Amortized Cost 0  
Amortized Cost 358,968 370,203
Estimated Fair Value    
Securities not due at a single maturity date, Estimated Fair Value 353,799  
Securities not due at a single maturity date, Estimated Fair Value 0  
Total, Estimated Fair Value $ 353,799 $ 363,473