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Consolidated Statements of Operations and Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Change in net unrealized gain (loss) on securities available for sale, tax | $ 29,740 | $ 1,560 | $ 437
Change in the non-credit portion of OTTI losses recognized in other comprehensive income (loss), tax | 13 | 49 | 44
Change in pension and post-retirement obligations, tax | 2,234 | 2,924 | 1,161
Reclassification adjustment for sales of available-for-sale securities, tax | $ 1,245 | $ 1,127 | $ 306

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