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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Numerator for Earnings per Share Basic and Diluted:        
Net income $ 21,436 $ 22,765 $ 47,599 $ 40,953
Less: Income allocated to participating shares 62 81 141 141
Net Income Allocated to Shareholders 21,374 22,684 47,458 40,812
Net Income Available to Shareholders $ 21,436 $ 22,765 $ 47,599 $ 40,953
Denominators for Earnings per Share:        
Weighted Average Shares Outstanding—Basic (in shares) 34,793,160 34,724,925 34,775,043 34,707,683
Add: Potentially dilutive shares (in shares) 264,416 181,571 267,998 199,693
Denominator for Treasury Stock Method—Diluted (in shares) 35,057,576 34,906,496 35,043,041 34,907,376
Weighted Average Shares Outstanding—Basic (in shares) 34,793,160 34,724,925 34,775,043 34,707,683
Add: Average participating shares outstanding (in shares) 100,212 123,729 103,449 119,585
Denominator for Two-Class Method—Diluted (in shares) 34,893,372 34,848,654 34,878,492 34,827,268
Earnings per share—basic (in dollars per share) $ 0.62 $ 0.66 $ 1.37 $ 1.18
Earnings per share—diluted (in dollars per share) 0.61 0.65 1.36 1.17
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 (in shares) 374,314 466,554 386,747 456,749
Restricted Stock        
Denominators for Earnings per Share:        
Anti-dilutive excluded from potentially dilutive shares (in shares) 89,974 126,332 76,325 105,187