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INVESTMENT SECURITIES (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]        
Available-for-sale securities sold $ 97,700      
Purchases of investment securities available for sale $ 97,400 $ 253,372 $ 46,215  
Average term of securities sold 3 years 3 months 18 days      
Average yield of securities sold 1.91%      
Gross proceeds from available-for-sale investment securities $ 96,000      
Average term of securities acquired 4 years 7 months 6 days      
Average yield of securities acquired 2.57%      
Gross realized losses on sale of available-for-sale investment securities $ 1,600      
Investment securities pledged as collateral $ 1,020,000 $ 1,020,000   $ 1,050,000