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SECURITIES (Details) - Successor Company - USD ($)
$ in Thousands
8 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Securities Available-for-Sale      
Par   $ 371,785 $ 520,135
Amortized Cost   304,628 474,201
Estimated Fair Value   229,206 417,519
Net realized and unrealized gains      
Net realized gains (losses) $ 2,891 5,763 (10,797)
Net (increase) decrease in unrealized losses (11,460) (18,783) (36,273)
Net realized and unrealized gains (losses) $ (8,569) (13,020) (47,070)
Securities, at estimated fair value      
Securities Available-for-Sale      
Par   371,785 520,135
Amortized Cost   304,628 474,201
Estimated Fair Value   $ 229,206 $ 417,519