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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
OTHER COMPREHENSIVE INCOME (LOSS)        
Unrealized holding gains (losses) on investment securities, deferred income tax expense (benefit) $ (2,488) $ 2,951 $ (9,544) $ 12,632
Reclassification adjustment for net realized investment (gains) losses included in net income (loss), income tax (expense) benefit 202 (141) 1,406 (2,368)
Reclassification adjustment for amounts amortized into net periodic pension and postretirement benefit cost (income), deferred income tax (expense) benefit $ (143) $ (146) $ (430) $ (439)