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INVESTMENT SECURITIES (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
security
shares
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2018
USD ($)
security
shares
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
security
Class of Stock [Line Items]              
Available-for-sale securities, sold at par $ 0 $ 0 $ 97,700 $ 0 $ 0    
Payments to acquire available-for-sale securities     $ 97,400   85,334 $ 333,242  
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 yield of securities acquired     2.57%        
Available-for-sale securities, gross realized losses     $ 1,600        
Investment securities pledged as collateral $ 1,000,000       $ 1,000,000   $ 1,080,000
Number of investment securities in an unrealized loss position | security 379       379   223
Visa [Member] | Common Class B [Member]              
Class of Stock [Line Items]              
Shares owned (in shares) | shares 34,631       34,631    
Credit Card Intermediary [Member] | Common Class B [Member]              
Class of Stock [Line Items]              
Shares owned (in shares) | shares 11,170       11,170