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Investment Securities Available-for-Sale - Expected maturities for residential mortgage backed securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Amortized Cost    
Amortized Cost $ 2,642,667 $ 1,129,057
Estimated Fair Value    
Allowance for credit losses (620) (167)
Estimated Fair Value 2,623,408 1,150,885
U.S. agency securities    
Amortized Cost    
One year or less, amortized cost 425,597 53,916
After one year through five years, amortized cost 141,537 110,083
Five years through ten years, amortized cost 62,092 17,087
Amortized Cost 629,273 181,087
Estimated Fair Value    
One year or less, estimated fair value 421,347 53,906
After one year through five years, estimated fair value 140,785 110,777
Five years through ten years, estimated fair value 60,255 17,240
Allowance for credit losses 0 0
Estimated Fair Value 622,387 181,921
Residential mortgage backed securities    
Amortized Cost    
Amortized cost, without maturity date 1,692,820 811,328
Amortized Cost 1,692,773 811,328
Estimated Fair Value    
Estimated fair value, without maturity date 1,677,673 825,001
Allowance for credit losses 0
Estimated Fair Value 1,677,673 825,001
Municipal bonds    
Amortized Cost    
One year or less, amortized cost 4,806 4,329
After one year through five years, amortized cost 25,457 26,622
Five years through ten years, amortized cost 97,945 69,309
After ten years, amortized cost 13,708 2,000
Amortized Cost 141,916 102,259
Estimated Fair Value    
One year or less, estimated fair value 4,861 4,348
After one year through five years, estimated fair value 26,816 28,272
Five years through ten years, estimated fair value 99,960 73,389
After ten years, estimated fair value 13,797 2,121
Allowance for credit losses (3) (18)
Estimated Fair Value 145,431 108,113
Corporate bonds    
Amortized Cost    
One year or less, amortized cost 18,924 5,218
After one year through five years, amortized cost 54,630 22,189
Five years through ten years, amortized cost 55,458 6,976
After ten years, amortized cost 0 0
Amortized Cost 129,012 34,383
Estimated Fair Value    
One year or less, estimated fair value 18,991 5,220
After one year through five years, estimated fair value 54,833 23,267
Five years through ten years, estimated fair value 55,252 7,511
After ten years, estimated fair value 0 0
Allowance for credit losses (617) (149)
Estimated Fair Value 128,459 35,850
US Treasury and Government    
Amortized Cost    
Amortized cost, without maturity date 49,693 0
Estimated Fair Value    
Estimated fair value, without maturity date $ 49,458 $ 0