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Stockholders Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stockholders Equity [Abstract]      
Unrecognized prior service cost and net actuarial loss on pension plans $ (21,557) $ (19,181)  
Unrealized net holding gains (losses) on available for sale securities (861) 2,154  
Accumulated other comprehensive loss $ (22,418) $ (17,027)  
Class of Warrant or Right [Line Items]      
Future dividend payment restrictions The approval of the Office of Comptroller of the Currency (OCC) is required to pay dividends when a bank fails to meet certain minimum regulatory capital standards or when such dividends are in excess of a subsidiary bank's earnings retained in the current year plus retained net profits for the preceding two years as specified in applicable OCC regulations.    
Preceding period of retained net profits for approval of Office of Comptroller of the Currency 2 years    
Statutory amount available for dividend payments $ 81,900    
Common stock repurchased during period (in shares) 1,047,152 3,288 584,925
Common stock repurchased during period $ 26,800    
Treasury stock acquired, average cost per share (in dollars per share) $ 25.59    
Stock repurchase program, number of additional shares authorized to be repurchased (in shares) 952,848