Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Earnings Per Share [Abstract]
Stock options excluded (in shares)	0	0	108,407
Net Income
Basic income available to common stockholders	$ 9,521	$ 11,953	$ 8,554
Diluted income available to common stockholders plus assumed conversions	$ 9,521	$ 11,953	$ 8,554
Shares
Basic income available to common stockholders (in shares)	27,528,940	27,394,737	25,555,654
Effect of dilutive stock options and warrants (in shares)	668,280	632,742	396,530
Diluted income available to common stockholders plus assumed conversions (in shares)	28,197,220	28,027,479	25,952,184
Per Share Amount
Basic income available to common stockholders (in dollars per share)	$ 0.35	$ 0.44	$ 0.33
Diluted income available to common stockholders plus assumed conversions (in dollars per share)	$ 0.34	$ 0.43	$ 0.33