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Investment Securities Available-for-Sale - Expected maturities for residential mortgage backed securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Amortized Cost    
Amortized Cost $ 1,803,898 $ 2,642,667
Estimated Fair Value    
Before allowance for credit loss, fair value 1,598,683 2,624,028
Allowance for credit losses (17) (620)
Estimated Fair Value, after allowance for credit losses 1,598,666 2,623,408
Amortized Cost    
HTM, Amortized cost 1,094,140 0
HTM Allowance for credit losses (766) 0
HTM, Amortized cost, after allowance 1,093,374 0
Estimated Fair Value    
HTM fair value 968,707 0
U.S. agency securities    
Amortized Cost    
One year or less, amortized cost 549,137 425,597
After one year through five years, amortized cost 111,742 141,537
Five years through ten years, amortized cost 73,886 62,092
After ten years, amortized cost 13,012
Amortized Cost 747,777 629,273
Estimated Fair Value    
One year or less, estimated fair value 490,699 421,347
After one year through five years, estimated fair value 100,297 140,785
Five years through ten years, estimated fair value 68,180 60,255
After ten years, estimated fair value 10,552
Residential mortgage-backed securities    
Amortized Cost    
Amortized cost, without maturity date 937,557 1,634,468
Amortized Cost 937,557 1,634,421
Estimated Fair Value    
Estimated fair value, without maturity date 820,503 1,618,027
Amortized Cost    
Amortized cost, without maturity date 741,057 0
HTM, Amortized cost 741,057  
Estimated Fair Value    
Estimated fair value, without maturity date 652,667 0
HTM fair value 652,667  
Commercial mortgage-backed securities    
Amortized Cost    
Amortized cost, without maturity date 56,071 58,352
Amortized Cost 56,071 58,352
Estimated Fair Value    
Estimated fair value, without maturity date 50,213 59,646
Amortized Cost    
Amortized cost, without maturity date 92,557
HTM, Amortized cost 92,557  
Estimated Fair Value    
Estimated fair value, without maturity date 80,564
HTM fair value 80,564  
US states and political subdivisions debt securities    
Amortized Cost    
One year or less, amortized cost 300 4,806
After one year through five years, amortized cost 1,444 25,457
Five years through ten years, amortized cost 8,956 97,945
After ten years, amortized cost 0 13,708
Estimated Fair Value    
One year or less, estimated fair value 300 4,861
After one year through five years, estimated fair value 1,488 26,816
Five years through ten years, estimated fair value 8,299 99,960
After ten years, estimated fair value 0 13,797
Amortized Cost    
One year or less, amortized cost 3,139 0
After one year through five years, amortized cost 35,579 0
Five years through ten years, amortized cost 77,262 0
After ten years, amortized cost 12,293 0
Estimated Fair Value    
One year or less, fair value 3,110 0
After one year through five years, fair value 33,743 0
Five years through ten years, fair value 67,945 0
After ten years, fair value 11,383 0
Corporate bonds    
Amortized Cost    
One year or less, amortized cost 0 18,924
After one year through five years, amortized cost 2,000 54,630
Five years through ten years, amortized cost 0 55,458
After ten years, amortized cost 0 0
Amortized Cost 2,000 129,012
Estimated Fair Value    
One year or less, estimated fair value 0 18,991
After one year through five years, estimated fair value 1,825 54,833
Five years through ten years, estimated fair value 0 55,252
After ten years, estimated fair value 0 0
Amortized Cost    
One year or less, amortized cost 23,954 0
After one year through five years, amortized cost 84,953 0
Five years through ten years, amortized cost 23,346 0
HTM, Amortized cost 132,253  
Estimated Fair Value    
One year or less, fair value 20,771 0
After one year through five years, fair value 77,997 0
Five years through ten years, fair value 20,527 0
HTM fair value 119,295  
U.S. treasury    
Amortized Cost    
Amortized cost, without maturity date 49,793 49,693
Estimated Fair Value    
Estimated fair value, without maturity date $ 46,327 $ 49,458