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Other Comprehensive Income - (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Accumulated balances for component of other comprehensive income, net of tax    
Unrealized gains on securities $ 19,433 $ 17,759
Non-credit related portion of other-than-temporary impairment on securities (16,789) (17,474)
Unrealized losses on derivative instruments (2,514) (1,633)
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations (6,070) (6,250)
Total accumulated other comprehensive loss $ (5,940) $ (7,598)