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SECURITIES (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Securities Available-for-Sale      
Par $ 495,548   $ 520,135
Amortized Cost 442,325   474,201
Estimated Fair Value 336,764   417,519
Net realized and unrealized gains      
Net realized gains (losses) (1,593) $ (526)  
Net (increase) decrease in unrealized losses (50,126) 1,834  
Net (increase) decrease in unrealized losses (51,719) $ 1,308  
Securities, at estimated fair value      
Securities Available-for-Sale      
Par 495,548   520,135
Amortized Cost 442,325   474,201
Estimated Fair Value $ 336,764   $ 417,519