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Shareholder-Designated Contribution Plan	12 Months Ended
Shareholder-Designated Contribution Plan	Dec. 31, 2016
Shareholder-Designated Contribution Plan [Abstract]
Shareholder-Designated Contribution Plan	J. Shareholder-Designated Contribution Plan During 2013, the Company established a Shareholder Designated Charitable Contribution program. Under the program, each shareholder is eligible to designate a charity to which the Company would make a donation based upon the actual number of shares registered in the shareholder’s name. Shares held in nominee or street name were not eligible to participate. The Board of Directors approved one contribution during 2015 of $0.25 per registered share. During 2015, the Company recorded a charge of $6.4 million, or $0.12 per diluted share, net of management fee and tax benefit related to the contributions which were included in shareholder-designated contribution on the consolidated statements of income. Based upon the number of registered shares that participated in the program in 2013, the Company recorded an additional charge of $134,000 during 2014.