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Accumulated Other Comprehensive Loss (Textual) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Accumulated Other Comprehensive Loss (Textual) [Abstract]      
Net unrealized gains (losses) on investment securities-available-for-sale, tax expense (benefit) $ (148) $ (113) $ 431
Pension and other postretirement benefits adjustment, tax benefit $ 16,601 $ 17,362 $ 10,117