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Investment Securities - Amortized Cost and Estimated Fair Value of Securities Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Amortized Cost    
Due in one year or less, Amortized Cost $ 32,120  
Due in one year or less, Amortized Cost 0  
Due after one year through five years, Amortized Cost 269,487  
Due after one year through five years, Amortized Cost 61,485  
Due after five years through ten years, Amortized Cost 365,430  
Due after five years through ten years, Amortized Cost 383,335  
Due after ten years, Amortized Cost 782,608  
Due after ten years, Amortized Cost 701,936  
Amortized Cost 3,210,489 $ 3,410,272
Amortized Cost 1,267,297 1,277,209
Estimated Fair Value    
Due in one year or less, Estimated Fair Value 31,736  
Due in one year or less, Estimated Fair Value 0  
Due after one year through five years, Estimated Fair Value 257,215  
Due after one year through five years, Estimated Fair Value 59,214  
Due after five years through ten years, Estimated Fair Value 337,362  
Due after five years through ten years, Estimated Fair Value 349,945  
Due after ten years, Estimated Fair Value 695,201  
Due after ten years, Estimated Fair Value 602,597  
Total, Estimated Fair Value 2,899,968 3,072,639
Estimated Fair Value 1,127,000 1,142,940
U.S. government-sponsored mortgage-backed securities    
Amortized Cost    
Securities not due at a single maturity date, Amortized Cost 1,409,549  
Securities not due at a single maturity date, Amortized Cost 120,541  
Amortized Cost 1,409,549 1,527,463
Amortized Cost 120,541 124,169
Estimated Fair Value    
Securities not due at a single maturity date, Estimated Fair Value 1,239,329  
Securities not due at a single maturity date, Estimated Fair Value 115,244  
Total, Estimated Fair Value 1,239,329 1,324,684
Estimated Fair Value 115,244 117,474
Private mortgage-backed securities    
Amortized Cost    
Securities not due at a single maturity date, Amortized Cost 166,271  
Securities not due at a single maturity date, Amortized Cost 0  
Amortized Cost 166,271 184,643
Estimated Fair Value    
Securities not due at a single maturity date, Estimated Fair Value 155,582  
Securities not due at a single maturity date, Estimated Fair Value 0  
Total, Estimated Fair Value 155,582 171,394
Non-government-sponsored asset backed securities    
Amortized Cost    
Securities not due at a single maturity date, Amortized Cost 185,024  
Securities not due at a single maturity date, Amortized Cost 0  
Amortized Cost 185,024 228,751
Estimated Fair Value    
Securities not due at a single maturity date, Estimated Fair Value 183,543  
Securities not due at a single maturity date, Estimated Fair Value 0  
Total, Estimated Fair Value $ 183,543 $ 225,648