Earnings Per Share - Reconciles Numerators and Denominators of Basic Earnings Per Share with Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator for Earnings per Share-Basic:
Net income	$ 22,765	$ 17,059	$ 40,953	$ 33,152
Less: Income allocated to participating shares	81	60	141	101
Net Income Allocated to Shareholders	22,684	16,999	40,812	33,051
Net Income Available to Shareholders	$ 22,765	$ 17,059	$ 40,953	$ 33,152
Denominators for Earnings per Share:
Weighted Average Shares Outstanding-Basic	34,724,925	34,674,712	34,707,683	34,666,773
Add: Potentially dilutive shares	181,571	89,853	199,693	80,890
Denominator for Treasury Stock Method-Diluted (in shares)	34,906,496	34,764,565	34,907,376	34,747,663
Weighted Average Shares Outstanding-Basic	34,724,925	34,674,712	34,707,683	34,666,773
Add: Average participating shares outstanding	123,729	122,160	119,585	105,794
Denominator for Two-Class Method-Diluted (in shares)	34,848,654	34,796,872	34,827,268	34,772,567
Earnings per share—basic (in dollars per share)	$ 0.66	$ 0.49	$ 1.18	$ 0.96
Earnings per share—diluted (in dollars per share)	0.65	0.49	1.17	0.95
Anti-dilutive warrants - exercise price (in dollars per share)	$ 31.53	$ 31.53	$ 31.53	$ 31.53
Warrants
Denominators for Earnings per Share:
Anti-dilutive excluded from potentially dilutive shares	466,554	517,012	456,749	517,012
Restricted Stock
Denominators for Earnings per Share:
Anti-dilutive excluded from potentially dilutive shares	126,332	144,998	105,187	117,796