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Other Comprehensive Income (Loss)- (Details 1) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Accumulated balances for component of other comprehensive income, net of tax    
Unrealized gains on securities $ 14,797 $ 9,490
Non-credit related portion of other-than-temporary impairment on securities (16,719) (16,719)
Unrealized losses on derivative instruments (1,351) (1,355)
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations (7,195) (7,320)
Total accumulated other comprehensive loss $ (10,468) $ (15,904)