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Investment Securities - Expected maturities for residential mortgage backed securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
AFS Amortized Cost [Abstract]    
Amortized Cost $ 1,897,985 $ 2,642,667
AFS Estimated Fair Value [Abstract]    
Allowance for credit losses (18) (620)
Estimated Fair Value 1,755,254 2,623,408
HTM Amortized Cost [Abstract]    
Allowance for credit losses (826) 0
Amortized Cost 1,143,632 0
HTM Estimated Fair Value [Abstract]    
Investment securities, held-to-maturity, estimated fair value 1,084,706 0
Debt Securities, Available-for-Sale and Held-to-Maturity [Abstract]    
Amortized Cost 3,041,617 2,642,667
Estimated Fair Value 2,839,960 2,623,408
U.S. treasury bonds    
AFS Amortized Cost [Abstract]    
One year or less 49,742 49,693
Amortized Cost 49,742 49,693
AFS Estimated Fair Value [Abstract]    
One year or less 47,081 49,458
Allowance for credit losses 0 0
U. S. agency securities    
AFS Amortized Cost [Abstract]    
One year or less 530,539 425,597
After one year through five years 165,716 141,584
After five years through ten years 54,648 62,092
Amortized Cost 750,903 629,273
AFS Estimated Fair Value [Abstract]    
One year or less 492,427 421,347
After one year through five years 156,493 140,785
After five years through ten years 49,137 60,255
Allowance for credit losses 0 0
Residential mortgage-backed securities    
AFS Amortized Cost [Abstract]    
Residential mortgage-backed securities 968,589 1,692,773
Amortized Cost 968,589 1,692,773
AFS Estimated Fair Value [Abstract]    
Residential mortgage-backed securities 885,689 1,677,673
Allowance for credit losses 0 0
HTM Amortized Cost [Abstract]    
One year or less 785,857 0
Allowance for credit losses 0  
HTM Estimated Fair Value [Abstract]    
One year or less 745,453 0
Investment securities, held-to-maturity, estimated fair value 745,453  
Commercial mortgage-backed securities    
AFS Amortized Cost [Abstract]    
Residential mortgage-backed securities 113,243 0
Amortized Cost 113,243  
AFS Estimated Fair Value [Abstract]    
Residential mortgage-backed securities 109,549 0
Allowance for credit losses 0  
HTM Amortized Cost [Abstract]    
One year or less 94,841 0
Allowance for credit losses 0  
HTM Estimated Fair Value [Abstract]    
One year or less 88,272 0
Investment securities, held-to-maturity, estimated fair value 88,272  
Municipal bonds    
AFS Amortized Cost [Abstract]    
One year or less 3,050 4,806
After one year through five years 1,416 25,457
After five years through ten years 9,042 97,945
After ten years 0 13,708
Amortized Cost 13,508 141,916
AFS Estimated Fair Value [Abstract]    
One year or less 3,053 4,861
After one year through five years 1,476 26,816
After five years through ten years 8,404 99,960
After ten years 0 13,797
Allowance for credit losses (1) (3)
HTM Amortized Cost [Abstract]    
One year or less 666 0
After one year through five years 38,194 0
After five years through ten years 72,954 0
After ten years 16,695 0
Allowance for credit losses (16)  
HTM Estimated Fair Value [Abstract]    
One year or less 663 0
After one year through five years 36,531 0
After five years through ten years 67,639 0
After ten years 15,443 0
Investment securities, held-to-maturity, estimated fair value 120,276  
Corporate bonds    
AFS Amortized Cost [Abstract]    
One year or less 0 18,924
After one year through five years 2,000 54,630
After five years through ten years 0 55,458
Amortized Cost 2,000 129,012
AFS Estimated Fair Value [Abstract]    
One year or less 0 18,991
After one year through five years 1,963 54,833
After five years through ten years 0 55,252
Allowance for credit losses (17) (617)
HTM Amortized Cost [Abstract]    
One year or less 25,042 0
After one year through five years 74,903 0
After five years through ten years 35,306 0
Allowance for credit losses (810)  
HTM Estimated Fair Value [Abstract]    
One year or less 24,936 0
After one year through five years 72,526 0
After five years through ten years 33,243 $ 0
Investment securities, held-to-maturity, estimated fair value $ 130,705