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Income Taxes - Summary of Provision for Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |
Federal | $ 35,673 | $ 33,032 | $ 11,917
State | 7,179 | 6,958 | 2,173
Total | 42,852 | 39,990 | 14,090
Deferred: |  |  |
Federal | 2,924 | 2,163 | 13,646
State | (1,037) | 838 | 4,004
Total | 1,887 | 3,001 | 17,650
Tax provision | $ 44,739 | $ 42,991 | $ 31,740

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