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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator for Earnings per Share Basic and Diluted:        
Net income $ 26,101 $ 21,436 $ 49,029 $ 47,599
Less: Income allocated to participating shares 71 62 137 141
Net Income Allocated to Shareholders 26,029 21,374 48,892 47,458
Net Income Available to Shareholders $ 26,101 $ 21,436 $ 49,029 $ 47,599
Denominators for Earnings per Share:        
Weighted Average Shares Outstanding—Basic (in shares) 34,158,136 34,793,160 34,298,185 34,775,043
Add: Potentially dilutive shares (in shares) 52,850 264,416 88,121 267,998
Denominator for Treasury Stock Method—Diluted (in shares) 34,210,986 35,057,576 34,386,306 35,043,041
Weighted Average Shares Outstanding—Basic (in shares) 34,158,136 34,793,160 34,298,185 34,775,043
Add: Average participating shares outstanding (in shares) 93,433 100,212 96,261 103,449
Denominator for Two-Class Method—Diluted (in shares) 34,251,569 34,893,372 34,394,446 34,878,492
Earnings per share—basic (in dollars per share) $ 0.76 $ 0.62 $ 1.43 $ 1.37
Earnings per share—diluted (in dollars per share) $ 0.76 $ 0.61 $ 1.43 $ 1.36
Restricted Stock        
Denominators for Earnings per Share:        
Anti-dilutive excluded from potentially dilutive shares (in shares) 5,183 0 44,153 2,047