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Income Taxes - Provision for income taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Current:                      
Federal                 $ 6,931 $ 7,688 $ 8,709
State                 1,049 1,196 1,395
Total current                 7,980 8,884 10,104
Deferred:                      
Federal                 (221) 308 1,474
State                 (33) 48 236
Total deferred                 (292) 356 1,710
Income tax expense $ 1,702 $ 1,698 $ 2,041 $ 2,285 $ 2,384 $ 2,369 $ 2,665 $ 1,822 $ 7,726 $ 9,240 $ 11,814