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Summary of Income Tax Expense (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  |  | $ 29,555,000 | $ 30,461,000 | $ 28,705,000
State |  |  |  |  |  |  |  |  |  | 9,183,000 | 9,283,000 | 9,374,000
Total current income tax expense |  |  |  |  |  |  |  |  |  | 38,738,000 | 39,744,000 | 38,079,000
Deferred |  |  |  |  |  |  |  |  |  |  |  |
Federal | [1] |  |  |  |  |  |  |  |  | 22,246,000 | (70,000) | (3,451,000)
State | [1] |  |  |  |  |  |  |  |  | 3,641,000 | (12,000) | (629,000)
Total deferred income tax (benefit) expense | [1] |  |  |  |  |  |  |  |  | 25,887,000 | (82,000) | (4,080,000)
Total income tax expense |  | $ 31,327,000 | $ 11,639,000 | $ 11,905,000 | $ 9,754,000 | $ 9,662,000 | $ 10,156,000 | $ 10,492,000 | $ 9,352,000 | 64,625,000 | 39,662,000 | 33,999,000
Tax benefit of operating loss carryforwards |  |  |  |  |  |  |  |  |  | $ 644,000 | $ 571,000 | $ 391,000
[1] | Includes tax benefit of operating loss carryforwards of $644,000, $571,000 and $391,000 for the years ended December 31, 2017, 2016, and 2015, respectively.

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