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INVESTMENT SECURITIES (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
security
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
security
Investments, Debt and Equity Securities [Abstract]        
Available-for-sale securities, sold at par $ 97,700      
Number of investment securities in an unrealized loss position | security   345   223
Investment securities pledged as collateral   $ 1,030,000   $ 1,080,000
Payments to acquire available-for-sale securities $ 97,400 $ 85,313 $ 253,372  
Available-for-sale securities, average term of securities sold 3 years 4 months      
Available-for-sale securities, average yield of securities sold 1.91%      
Available-for-sale securities, gross realized gains (losses), sale proceeds $ 96,000      
Available-for-sale securities, average term of securities acquired 4 years 7 months      
Available-for-sale securities, average yield of securities acquired 2.57%      
Available-for-sale securities, gross realized losses $ 1,600