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Summary of Significant Accounting Policies - Recent Accounting and Regulatory Pronouncements (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Right to use asset | $ 113,400 |  | $ 87,400 |  |  |
Lease Liability | 118,321 |  | 88,800 |  |  |
Allowance for credit losses | 457,309 | $ 54,400 | 56,927 |  |  |
Shareholders' equity | 4,647,880 |  | 2,373,013 |  | $ 2,366,296 | $ 2,308,920
ASU 2016- 02 | Adjustment for ASU |  |  |  |  |  |
Right to use asset |  |  |  | $ 82,200 |  |
Lease Liability |  |  |  | $ 82,200 |  |
ASU 2016-13 |  |  |  |  |  |
Allowance for credit losses |  | $ 54,438 |  |  |  |
ASU 2016-13 | Cumulative Effect of Adoption of ASU |  |  |  |  |  |
Shareholders' equity | $ (44,820) |  |  |  |  |
2018-15 |  |  |  |  |  |
Capitalized implementation costs related to internal use software |  |  | $ 2,900 |  |  |

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