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Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Investments Available-for-Sale by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
AFS Amortized Cost [Abstract]    
Amortized Cost $ 1,732,722 $ 1,803,898
AFS Estimated Fair Value [Abstract]    
Allowance for credit losses 17 17
Estimated Fair Value 1,535,589 1,598,666
HTM Amortized Cost [Abstract]    
Allowance for credit losses 2,010 766
Total held-to-maturity securities, net of ACL 1,055,181 1,093,374
HTM Estimated Fair Value [Abstract]    
Investment securities held-to-maturity 923,313 968,707
Debt Securities, Available-for-Sale and Held-to-Maturity [Abstract]    
Amortized Cost 2,787,903 2,897,272
Estimated Fair Value 2,458,902 2,567,373
U. S. agency securities    
AFS Amortized Cost [Abstract]    
One year or less 549,703 549,137
After one year through five years 125,808 111,742
After five years through ten years 51,836 73,886
After ten years 12,238 13,012
Amortized Cost 739,585 747,777
AFS Estimated Fair Value [Abstract]    
One year or less 495,038 490,699
After one year through five years 113,310 100,297
After five years through ten years 47,266 68,180
After ten years 9,802 10,552
Allowance for credit losses 0 0
HTM Amortized Cost [Abstract]    
One year or less 0 0
After one year through five years 0 0
After five years through ten years 0 0
HTM Estimated Fair Value [Abstract]    
One year or less 0 0
After one year through five years 0 0
After five years through ten years 0 0
Residential mortgage-backed securities    
AFS Amortized Cost [Abstract]    
Residential mortgage-backed securities 877,441 937,557
Amortized Cost 877,441 937,557
AFS Estimated Fair Value [Abstract]    
Residential mortgage-backed securities 764,590 820,503
Allowance for credit losses 0 0
HTM Amortized Cost [Abstract]    
One year or less 705,256 741,057
HTM Estimated Fair Value [Abstract]    
One year or less 615,772 652,667
Investment securities held-to-maturity 615,772 652,667
Commercial mortgage-backed securities    
AFS Amortized Cost [Abstract]    
Residential mortgage-backed securities 54,982 56,071
Amortized Cost 54,982 56,071
AFS Estimated Fair Value [Abstract]    
Residential mortgage-backed securities 48,969 50,213
Allowance for credit losses 0 0
HTM Amortized Cost [Abstract]    
One year or less 91,838 92,557
HTM Estimated Fair Value [Abstract]    
One year or less 78,358 80,564
Investment securities held-to-maturity 78,358 80,564
Municipal bonds    
AFS Amortized Cost [Abstract]    
One year or less 0 300
After one year through five years 0 1,444
After five years through ten years 8,871 8,956
After ten years 0 0
Amortized Cost 8,871 10,700
AFS Estimated Fair Value [Abstract]    
One year or less 0 300
After one year through five years 0 1,488
After five years through ten years 8,312 8,299
After ten years 0 0
Allowance for credit losses 0 0
HTM Amortized Cost [Abstract]    
One year or less 2,907 3,139
After one year through five years 40,325 35,579
After five years through ten years 72,368 77,262
After ten years 12,225 12,293
HTM Estimated Fair Value [Abstract]    
One year or less 2,890 3,110
After one year through five years 37,922 33,743
After five years through ten years 65,014 67,945
After ten years 11,294 11,383
Investment securities held-to-maturity 117,120 116,181
Corporate bonds    
AFS Amortized Cost [Abstract]    
One year or less 0 0
After one year through five years 2,000 2,000
After five years through ten years 0 0
Amortized Cost 2,000 2,000
AFS Estimated Fair Value [Abstract]    
One year or less 0 0
After one year through five years 1,690 1,825
After five years through ten years 0 0
Allowance for credit losses 17 17
HTM Amortized Cost [Abstract]    
One year or less 23,984 23,954
After one year through five years 91,441 84,953
After five years through ten years 16,847 23,346
HTM Estimated Fair Value [Abstract]    
One year or less 20,889 20,771
After one year through five years 77,941 77,997
After five years through ten years 13,233 20,527
Investment securities held-to-maturity 112,063 119,295
U.S. Treasury    
AFS Amortized Cost [Abstract]    
Residential mortgage-backed securities 49,843 49,793
AFS Estimated Fair Value [Abstract]    
Residential mortgage-backed securities $ 46,629 $ 46,327