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SECURITIES (Details) - Successor Company - USD ($)
$ in Thousands
8 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Securities Available-for-Sale    
Par $ 721,094 $ 520,135
Amortized Cost 654,257 474,201
Estimated Fair Value 638,605 417,519
Net realized and unrealized gains    
Net realized gains (losses) 2,891 (10,797)
Net (increase) decrease in unrealized losses (11,460) (36,273)
Net (increase) decrease in unrealized losses (8,569) (47,070)
Securities, at estimated fair value    
Securities Available-for-Sale    
Par 721,094 520,135
Amortized Cost 654,257 474,201
Estimated Fair Value $ 638,605 $ 417,519