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Earnings Per Share - Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator for Earnings per Common Share-Basic:                      
Net Income                 $ 72,968 $ 71,392 $ 67,081
Less: Income allocated to participating shares                 242 225 280
Net Income Allocated to Common Shareholders $ 9,294 $ 22,721 $ 22,765 $ 18,188 $ 17,659 $ 20,581 $ 17,059 $ 16,093 72,726 71,167 66,801
Numerator for Earnings per Common Share—Diluted:                      
Net Income                 $ 72,968 $ 71,392 $ 67,081
Denominators:                      
Weighted Average Common Shares Outstanding-Basic (in shares)                 34,729,376 34,677,738 33,812,990
Add: Dilutive potential common shares (in shares)                 225,391 95,432 35,092
Denominator for Treasury Stock Method-Diluted (in shares)                 34,954,767 34,773,170 33,848,082
Weighted Average Common Shares Outstanding-Basic (in shares)                 34,729,376 34,677,738 33,812,990
Add: Average participating shares outstanding (in shares)                 115,418 109,755 141,558
Denominator for Two-Class Method-Diluted (in shares)                 34,844,794 34,787,493 33,954,548
Earnings per common share—basic (in USD per share)                 $ 2.10 $ 2.06 $ 1.98
Earnings per common share—diluted (in USD per share) $ 0.27 $ 0.65 $ 0.65 $ 0.52 $ 0.51 $ 0.59 $ 0.49 $ 0.46 2.09 2.05 1.98
Exercise price of warrants (in USD per share) $ 31.53       $ 31.53       $ 31.53 $ 31.53 $ 31.53
Warrants                      
Denominators:                      
Anti-dilutive excluded from dilutive potential common shares (in shares)                 438,681 517,012 517,012
Restricted Stock                      
Denominators:                      
Anti-dilutive excluded from dilutive potential common shares (in shares)                 88,578 116,749 106,466