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SECURITIES (Narrative) (Details) - USD ($)
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Investment [Line Items]        
Held to maturity securities $ (87,965,000)     $ (236,283,000)
Securities available for sale 3,020,568,000     2,450,709,000
Fair value of securities pledged 431,500,000     524,800,000
Gross realized gains or losses on sale of securities 0 $ 0    
Equity securities without readily determinable fair value 29,000,000.0     28,400,000
Amortized cost of FHLBs $ 14,900,000     $ 16,600,000
ASU 2017-12        
Investment [Line Items]        
Held to maturity securities     $ 148,000,000.0  
Securities available for sale     $ 148,000,000.0