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INVESTMENT SECURITIES (Details 4) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]        
Proceeds from sales $ 143,513 $ 855,425 $ 1,008,256 $ 1,328,487
Gross realized gains 1,790 17,036 8,593 26,994
Gross realized losses 0 0 125 0
Related tax expense $ 752 $ 7,155 $ 3,560 $ 11,337