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Other Comprehensive Income - (Details 1) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Accumulated balances for component of other comprehensive income, net of tax    
Unrealized gains on securities $ 19,593 $ 16,500
Non-credit related portion of other-than-temporary impairment on securities (16,719) (16,735)
Unrealized losses on derivative instruments (3,576) (1,882)
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations (7,266) (7,418)
Total accumulated other comprehensive loss $ (7,968) $ (9,535)