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Income Taxes - Provision for income taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Current: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 1,705 | $ 4,563 | $ 6,964
State |  |  |  |  |  |  |  |  | 340 | 724 | 1,054
Total current |  |  |  |  |  |  |  |  | 2,045 | 5,287 | 8,018
Deferred: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 1,847 | (1,688) | (254)
State |  |  |  |  |  |  |  |  | 369 | (268) | (38)
Total deferred |  |  |  |  |  |  |  |  | 2,216 | (1,956) | (292)
Income tax expense | $ (171) | $ 3,712 | $ 220 | $ 500 | $ (641) | $ 981 | $ 1,188 | $ 1,803 | $ 4,261 | $ 3,331 | $ 7,726

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