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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ 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
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Basic                      
Net income available to common shareholders $ 15,118 $ 15,138 $ 14,833 $ 14,251 $ 13,854 $ 14,497 $ 17,390 $ 12,680 $ 59,340 $ 58,421 $ 52,041
Less: income attributable to unvested stock-based compensation awards                 (912) (834) (503)
Net earnings allocated to common shareholders                 $ 58,428 $ 57,587 $ 51,538
Weighted average shares outstanding, including unvested stock-based                 15,044,733 14,940,274 14,824,333
Less: unvested stock-based compensation awards                 (232,021) (212,081) (147,711)
Weighted average shares outstanding - Basic                 14,812,712 14,728,193 14,676,622
Diluted                      
Net earnings allocated to common shareholders                 $ 58,428 $ 57,587 $ 51,538
Plus: incremental shares from assumed conversion of stock-based                 123,519 134,833 113,002
Weighted average shares outstanding - Diluted                 14,936,231 14,863,026 14,789,624
Basic Earnings Per Share (in dollars per share) $ 1.00 $ 1.01 $ 0.99 $ 0.95 $ 0.93 $ 0.97 $ 1.16 $ 0.85 $ 3.94 $ 3.91 $ 3.51
Diluted Earnings Per Share (in dollars per share) $ 0.99 $ 1.00 $ 0.98 $ 0.94 $ 0.92 $ 0.96 $ 1.15 $ 0.84 $ 3.91 $ 3.87 $ 3.48