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Other Comprehensive Income - (Details 1) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Accumulated balances for component of other comprehensive income, net of tax    
Unrealized gains on securities $ 15,783 $ 17,759
Non-credit related portion of other-than-temporary impairment on securities (16,830) (17,474)
Unrealized losses on derivative instruments (1,439) (1,633)
Unrecognized defined benefit pension and post-retirement benefit plans obligations (6,125) (6,250)
Total accumulated other comprehensive loss $ (8,611) $ (7,598)