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SECURITIES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Securities Available-for-Sale          
Par $ 327,462   $ 327,462   $ 371,785
Amortized Cost 248,592   248,592   304,628
Estimated Fair Value 263,055   263,055   229,206
Net realized and unrealized gains (losses)          
Net realized gains (losses) 3,402 $ 5,779 5,258 $ 4,186  
Net (increase) decrease in unrealized losses 2,372 15,030 87,367 (35,096)  
Net realized and unrealized gains (losses) 5,774 $ 20,809 92,625 $ (30,910)  
Securities, at estimated fair value          
Securities Available-for-Sale          
Par 327,462   327,462   371,785
Amortized Cost 248,592   248,592   304,628
Estimated Fair Value $ 263,055   $ 263,055   $ 229,206