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Investment Securities - Amortized Cost and Fair value of AFS and HTM Debt Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
AFS, Amortized Cost    
AFS, Amortized Cost, Within 1 year $ 142,642  
AFS, Amortized Cost, 1 to 5 years 516,190  
AFS, Amortized Cost, 5 to 10 years 232,493  
AFS, Amortized Cost, More than 10 years 227,923  
AFS, Amortized Cost, Not due at single maturity 2,532,463  
Amortized Cost 3,651,711 $ 3,579,955
AFS, Fair Value    
AFS, Fair Value, Within 1 year 141,978  
AFS, Fair Value, 1 to 5 years 486,024  
AFS, Fair Value, 5 to 10 years 211,776  
AFS, Fair Value, More than 10 years 215,591  
AFS, Fair Value, Not due at single maturity 2,338,030  
Fair Value 3,393,399 3,331,084
HTM, Amortized Cost    
HTM, Amortized Cost, Within 1 year 1,200  
HTM, Amortized Cost, 1 to 5 years 47,069  
HTM, Amortized Cost, 5 to 10 years 143,299  
HTM, Amortized Cost, More than 10 years 234,592  
HTM, Amortized Cost, Not due at single maturity 2,038,973  
Amortized Cost 2,465,133 2,490,848
HTM, Fair Value    
HTM, Fair Value, Within 1 year 1,194  
HTM, Fair Value, 1 to 5 years 43,358  
HTM, Fair Value, 5 to 10 years 120,815  
HTM, Fair Value, More than 10 years 186,466  
HTM, Fair Value, Not due at single maturity 1,691,079  
Fair value 2,042,912 2,095,620
U.S. Treasuries    
AFS, Amortized Cost    
AFS, Amortized Cost, Within 1 year 122,246  
AFS, Amortized Cost, 1 to 5 years 289,394  
Amortized Cost 411,640 398,021
AFS, Fair Value    
AFS, Fair Value, Within 1 year 122,094  
AFS, Fair Value, 1 to 5 years 276,686  
Fair Value 398,780 387,349
HTM, Amortized Cost    
HTM, Amortized Cost, Within 1 year 0  
HTM, Amortized Cost, 1 to 5 years 19,872  
Amortized Cost 19,872 19,864
HTM, Fair Value    
HTM, Fair Value, Within 1 year 0  
HTM, Fair Value, 1 to 5 years 17,779  
Fair value 17,779 17,950
U.S. Government agencies & GSEs    
AFS, Amortized Cost    
AFS, Amortized Cost, Within 1 year 371  
AFS, Amortized Cost, 1 to 5 years 46,818  
AFS, Amortized Cost, 5 to 10 years 129,138  
AFS, Amortized Cost, More than 10 years 136,081  
Amortized Cost 312,408 281,708
AFS, Fair Value    
AFS, Fair Value, Within 1 year 357  
AFS, Fair Value, 1 to 5 years 43,034  
AFS, Fair Value, 5 to 10 years 122,597  
AFS, Fair Value, More than 10 years 131,438  
Fair Value 297,426 267,500
HTM, Amortized Cost    
HTM, Amortized Cost, Within 1 year 0  
HTM, Amortized Cost, 1 to 5 years 0  
HTM, Amortized Cost, 5 to 10 years 72,635  
HTM, Amortized Cost, More than 10 years 26,417  
Amortized Cost 99,052 99,052
HTM, Fair Value    
HTM, Fair Value, Within 1 year 0  
HTM, Fair Value, 1 to 5 years 0  
HTM, Fair Value, 5 to 10 years 61,301  
HTM, Fair Value, More than 10 years 21,078  
Fair value 82,379 83,363
State and political subdivisions    
AFS, Amortized Cost    
AFS, Amortized Cost, Within 1 year 3,147  
AFS, Amortized Cost, 1 to 5 years 27,823  
AFS, Amortized Cost, 5 to 10 years 59,827  
AFS, Amortized Cost, More than 10 years 91,032  
Amortized Cost 181,829 182,546
AFS, Fair Value    
AFS, Fair Value, Within 1 year 3,114  
AFS, Fair Value, 1 to 5 years 25,762  
AFS, Fair Value, 5 to 10 years 51,150  
AFS, Fair Value, More than 10 years 83,237  
Fair Value 163,263 164,049
HTM, Amortized Cost    
HTM, Amortized Cost, Within 1 year 1,200  
HTM, Amortized Cost, 1 to 5 years 27,197  
HTM, Amortized Cost, 5 to 10 years 55,664  
HTM, Amortized Cost, More than 10 years 208,175  
Amortized Cost 292,236 292,705
HTM, Fair Value    
HTM, Fair Value, Within 1 year 1,194  
HTM, Fair Value, 1 to 5 years 25,579  
HTM, Fair Value, 5 to 10 years 47,296  
HTM, Fair Value, More than 10 years 165,388  
Fair value 239,457 242,439
Corporate bonds    
AFS, Amortized Cost    
AFS, Amortized Cost, Within 1 year 16,878  
AFS, Amortized Cost, 1 to 5 years 152,155  
AFS, Amortized Cost, 5 to 10 years 43,528  
AFS, Amortized Cost, More than 10 years 810  
Amortized Cost 213,371 218,285
AFS, Fair Value    
AFS, Fair Value, Within 1 year 16,413  
AFS, Fair Value, 1 to 5 years 140,542  
AFS, Fair Value, 5 to 10 years 38,029  
AFS, Fair Value, More than 10 years 916  
Fair Value 195,900 201,222
HTM, Amortized Cost    
HTM, Amortized Cost, Within 1 year 0  
HTM, Amortized Cost, 1 to 5 years 0  
HTM, Amortized Cost, 5 to 10 years 0  
HTM, Amortized Cost, More than 10 years 0  
HTM, Fair Value    
HTM, Fair Value, Within 1 year 0  
HTM, Fair Value, 1 to 5 years 0  
HTM, Fair Value, 5 to 10 years 0  
HTM, Fair Value, More than 10 years 0  
Supranational entities    
AFS, Amortized Cost    
AFS, Amortized Cost, 5 to 10 years 0  
AFS, Fair Value    
AFS, Fair Value, 5 to 10 years 0  
HTM, Amortized Cost    
HTM, Amortized Cost, 5 to 10 years 15,000  
Amortized Cost 15,000 15,000
HTM, Fair Value    
HTM, Fair Value, 5 to 10 years 12,218  
Fair value 12,218 12,500
Asset-backed securities    
AFS, Amortized Cost    
AFS, Amortized Cost, Not due at single maturity 148,738  
Amortized Cost 148,738 164,728
AFS, Fair Value    
AFS, Fair Value, Not due at single maturity 147,056  
Fair Value 147,056 $ 161,712
HTM, Amortized Cost    
HTM, Amortized Cost, Not due at single maturity 0  
HTM, Fair Value    
HTM, Fair Value, Not due at single maturity 0  
Residential MBS    
AFS, Amortized Cost    
AFS, Amortized Cost, Not due at single maturity 1,670,549  
AFS, Fair Value    
AFS, Fair Value, Not due at single maturity 1,517,893  
HTM, Amortized Cost    
HTM, Amortized Cost, Not due at single maturity 1,360,395  
HTM, Fair Value    
HTM, Fair Value, Not due at single maturity 1,136,965  
Commercial MBS    
AFS, Amortized Cost    
AFS, Amortized Cost, Not due at single maturity 713,176  
AFS, Fair Value    
AFS, Fair Value, Not due at single maturity 673,081  
HTM, Amortized Cost    
HTM, Amortized Cost, Not due at single maturity 678,578  
HTM, Fair Value    
HTM, Fair Value, Not due at single maturity $ 554,114