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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

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