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DEPOSITS (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash and Cash Equivalents [Line Items]    
Time deposits held in Certificates of Deposit $ 2,089,706  
Deposit overdrafts as other consumer loans 2,000 $ 1,300
CDARS    
Cash and Cash Equivalents [Line Items]    
Time deposits held in Certificates of Deposit $ 118,300 $ 13,900
Maximum | CDARS    
Cash and Cash Equivalents [Line Items]    
Maturity of deposits held in Certificate of Deposits 1 year