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Current Accounting Developments and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Mar. 31, 2019
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Allowance for loan losses | $ 557,003 |  | $ 358,287 | $ 317,894
Retained earnings | $ 3,695,759 |  | $ 3,689,377 |
ASU 2016-13 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Allowance for loan losses |  | $ 125,200 |  |
Retained earnings |  | 98,000 |  |
ASU 2016-13 | Unfunded Credit Commitments |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Allowance for loan losses |  | $ 10,500 |  |

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