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Securities Available for Sale - Amortized Cost and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Amortized Cost    
Due within one year $ 2,616  
Due after one year through five years 102,687  
Due after five years through ten years 159,709  
Due after ten years 2,056,683  
Amortized Cost 2,321,695 $ 2,685,648
Due within one year 0  
Due after one year through five years 0  
Due after five years through ten years 36,906  
Due after ten years 234,279  
Total 271,185  
Estimated Fair Value    
Due within one year 2,565  
Due after one year through five years 95,593  
Due after five years through ten years 143,728  
Due after ten years 1,751,462  
Estimated Fair Value 1,993,348 2,666,275
Due within one year 0  
Due after one year through five years 0  
Due after five years through ten years 35,677  
Due after ten years 223,000  
Total 258,677  
Collateralized mortgage obligations    
Amortized Cost    
Amortized Cost 974,052 1,039,543
Estimated Fair Value    
Estimated Fair Value 824,327 1,026,430
Mortgage-backed securities: Residential    
Amortized Cost    
Amortized Cost 555,997 769,113
Estimated Fair Value    
Estimated Fair Value 456,590 759,224
Mortgage-backed securities: Commercial    
Amortized Cost    
Amortized Cost 426,483 595,659
Estimated Fair Value    
Estimated Fair Value 379,615 599,402
Asset-backed Securities    
Amortized Cost    
Amortized Cost 153,548 153,564
Estimated Fair Value    
Estimated Fair Value 143,903 153,451
Municipal Bonds [Member]    
Amortized Cost    
Amortized Cost 180,265 104,371
Estimated Fair Value    
Estimated Fair Value 162,434 $ 105,284
US Treasury Notes Securities    
Amortized Cost    
Amortized Cost 3,988  
Estimated Fair Value    
Estimated Fair Value $ 3,889