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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
 [1]
Sep. 30, 2017
 [1]
Jun. 30, 2017
 [1]
Mar. 31, 2017
 [1]
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Provision for income taxes (credit)                      
Current expense                 $ 9,451 $ 8,642 $ 3,046
Deferred expense (benefit)                 618 (1,157) (547)
TOTALS $ 4,084 $ 2,009 $ 2,004 $ 1,972 $ 2,014 $ 1,967 $ 1,833 $ 1,671 $ 10,069 $ 7,485 $ 2,499
[1] Income tax expense for the fourth quarter was elevated due to the additional $1.8 million of tax expense from the re-measurement of the Company’s net deferred tax asset.