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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | Jan. 01, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |
Impact to Retained Earnings |  | $ 696,429 | $ 585,304 | $ 498,047 | $ 417,945
Lease right-of-use assets |  | 94,727 | 84,073 |  |
Operating lease liability |  | 97,162 | $ 86,713 |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |
Impact to Retained Earnings |  | $ (515) |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |
Impact to Retained Earnings | $ 500 |  |  |  |
Adjustments | ASU 2016-13 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |
Increase in Allowance for Credit Losses | 700 |  |  |  |
Increase to Deferred Tax Assets | $ 200 |  |  |  |

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