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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Basic                      
Net income available to common shareholders $ 18,911 $ 20,902 $ 22,059 $ 20,436 $ 2,457 $ 17,394 $ 16,926 $ 15,717 $ 82,308 $ 52,494 $ 59,340
Less: dividends and undistributed earnings allocated to unvested restricted stock awards                 (1,315) (818) (912)
Net earnings allocated to common shareholders                 $ 80,993 $ 51,676 $ 58,428
Weighted average shares outstanding, including unvested stock-based compensation awards (in shares)                 15,283,914 15,193,438 15,044,733
Less: unvested stock-based compensation awards (in shares)                 (244,685) (243,006) (232,021)
Weighted average shares outstanding - Basic (in shares)                 15,039,229 14,950,432 14,812,712
Diluted                      
Net earnings allocated to common shareholders                 $ 80,993 $ 51,676 $ 58,428
Weighted average shares outstanding - Basic (in shares)                 15,039,229 14,950,432 14,812,712
Plus: incremental shares from assumed conversion of stock-based compensation awards (in shares)                 93,028 122,823 123,519
Weighted average shares outstanding - Diluted (in shares)                 15,132,257 15,073,255 14,936,231
Basic EPS (in dollars per share) $ 1.24 $ 1.37 $ 1.44 $ 1.34 $ 0.16 $ 1.14 $ 1.11 $ 1.04 $ 5.39 $ 3.46 $ 3.94
Diluted EPS (in dollars per share) $ 1.23 $ 1.36 $ 1.43 $ 1.33 $ 0.16 $ 1.14 $ 1.11 $ 1.03 $ 5.35 $ 3.43 $ 3.91
Antidilutive securities excluded from computation of earning per share (in shares)                 10,013 20,789 72,321