Earnings Per Common Share (Schedule of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||||||||||||||||
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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 |
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Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] | |||||||||||||||||||||||||
Basic earnings allocated to common shareholders | $ 103,310 | $ 97,577 | $ 80,637 | ||||||||||||||||||||||
Net income | $ 30,718 | $ 27,484 | $ 25,405 | $ 21,259 | $ 26,740 | $ 25,780 | $ 21,946 | $ 24,361 | 104,866 | 98,827 | 81,574 | ||||||||||||||
Earnings allocated to participating securities - preferred shares | 185 | 175 | 157 | ||||||||||||||||||||||
Earnings allocated to participating securities - nonvested restricted shares | $ 1,371 | $ 1,075 | $ 780 | ||||||||||||||||||||||
Weighted average common shares outstanding | 57,184 | 57,019 | 52,618 | ||||||||||||||||||||||
Basic earnings per common share | $ 0.53 | [1] | $ 0.47 | [1] | $ 0.44 | [1] | $ 0.37 | [1] | $ 0.46 | [1] | $ 0.45 | [1] | $ 0.38 | [1] | $ 0.42 | [1] | $ 1.81 | [1] | $ 1.71 | [1] | $ 1.53 | ||||
Earnings allocated to common shareholders, Diluted | [2] | $ 103,310 | $ 97,577 | $ 80,640 | |||||||||||||||||||||
Weighted average number of common shares outstanding | 57,184 | 57,019 | 52,618 | ||||||||||||||||||||||
Dilutive effect of equity awards and warrants | 9 | 13 | 565 | ||||||||||||||||||||||
Weighted average diluted common shares outstanding | 57,193 | 57,032 | 53,183 | ||||||||||||||||||||||
Diluted earnings per common share | $ 0.53 | [1] | $ 0.47 | [1] | $ 0.44 | [1] | $ 0.37 | [1] | $ 0.46 | [1] | $ 0.45 | [1] | $ 0.38 | [1] | $ 0.42 | [1] | $ 1.81 | [1] | $ 1.71 | [1] | $ 1.52 | ||||
Potentially dilutive share options that were not included in the computation of diluted EPS because to do so would be anti-dilutive. | 19 | 37 | 64 | ||||||||||||||||||||||
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