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Other Comprehensive Income (Loss) - Accumulated Balances for Each Component of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accumulated balances for component of other comprehensive income, net of tax    
Unrealized gains on securities $ 21,772 $ 1,066
Non-credit related portion of other-than-temporary impairment on securities (11,319) (11,319)
Unrealized losses on derivative instruments (3,086)  
Unrealized losses on derivative instruments   (630)
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations (6,857) (7,013)
Total accumulated other comprehensive income (loss) $ 510 $ (17,896)