Share Repurchase Plan	12 Months Ended
Dec. 31, 2016
Equity [Abstract]
Share Repurchase Plan	Share Repurchase Plan On October 23, 2013, the Corporation’s Board of Directors approved a new stock repurchase plan for the repurchase of up to 800,000 shares of common stock, or approximately 5% of the shares outstanding. During the year ended December 31, 2014, the Corporation repurchased 110,997 shares at a cost of $2.0 million under the share repurchase program. On May 27, 2015, the Corporation's Board of Directors approved an increase of 1,000,000 shares in the common shares available for repurchase under the Corporation's share repurchase program, or approximately 5% of the Corporation's common stock outstanding as of May 27, 2015. During the years ended December 31, 2016 and 2015, the Corporation repurchased 66,000 and 608,757 shares of common stock at a cost of $1.4 million and $12.0 million, respectively, under the share repurchase program. Shares available for future repurchases under the plan totaled 1,014,246 at December 31, 2016. Total shares outstanding at December 31, 2016 were 26,589,353. At December 31, 2016, the aggregate purchases recorded as treasury stock, at cost, on the Corporation's consolidated balance sheet was $44.9 million. The Corporation will repurchase shares of its common stock from time to time through open market purchases, tender offers, privately negotiated purchases or other means. The share repurchase program does not obligate the Corporation to acquire any particular amount of common stock. The program has no scheduled expiration date and the Board of Directors has the right to suspend or discontinue the program at any time.

Share Repurchase Plan

On October 23, 2013, the Corporation’s Board of Directors approved a new stock repurchase plan for the repurchase of up to 800,000 shares of common stock, or approximately 5% of the shares outstanding. During the year ended December 31, 2014, the Corporation repurchased 110,997 shares at a cost of $2.0 million under the share repurchase program.

On May 27, 2015, the Corporation's Board of Directors approved an increase of 1,000,000 shares in the common shares available for repurchase under the Corporation's share repurchase program, or approximately 5% of the Corporation's common stock outstanding as of May 27, 2015. During the years ended December 31, 2016 and 2015, the Corporation repurchased 66,000 and 608,757 shares of common stock at a cost of $1.4 million and $12.0 million, respectively, under the share repurchase program. Shares available for future repurchases under the plan totaled 1,014,246 at December 31, 2016. Total shares outstanding at December 31, 2016 were 26,589,353. At December 31, 2016, the aggregate purchases recorded as treasury stock, at cost, on the Corporation's consolidated balance sheet was $44.9 million. The Corporation will repurchase shares of its common stock from time to time through open market purchases, tender offers, privately negotiated purchases or other means. The share repurchase program does not obligate the Corporation to acquire any particular amount of common stock. The program has no scheduled expiration date and the Board of Directors has the right to suspend or discontinue the program at any time.