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Unfunded Loan Commitments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Credit Loss [Abstract] |  |  |
Contractual obligation | $ 1,800,000 |  |
Allowance: |  |  |
Beginning balance | 110,044 | $ 2,481 | $ 2,165
Provisions for unfunded loan commitments | 232,822 | 311,659 | 5,937
Other provision items | 31,502 | 954 | 596
Transfer - funded loans | (301,655) | (320,808) | (6,217)
Ending balance | 72,713 | 110,044 | 2,481
Unfunded Commitments |  |  |
Beginning balance | 1,673,018 | 1,910,603 | 2,010,744
Provision/New commitments - net | 5,512,841 | 5,070,175 | 5,513,790
Other provision items | 0 | 0 | 0
Transfer - funded loans | (5,408,883) | (5,307,760) | (5,613,931)
Ending balance | $ 1,776,976 | 1,673,018 | 1,910,603
Cumulative Effect, Period of Adoption, Adjustment |  |  |
Allowance: |  |  |
Beginning balance |  | 115,758 |
Ending balance |  |  | 115,758
Unfunded Commitments |  |  |
Beginning balance |  | 0 |
Ending balance |  |  | 0
Cumulative Effect, Period Of Adoption, Adjusted Balance |  |  |
Allowance: |  |  |
Beginning balance |  | 118,239 |
Ending balance |  |  | 118,239
Unfunded Commitments |  |  |
Beginning balance |  | $ 1,910,603 |
Ending balance |  |  | $ 1,910,603

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