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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Securities sold under agreements to repurchase      
Outstanding balance at end of period $ 204,021 $ 173,473  
Securities sold under agreements to repurchase      
Securities sold under agreements to repurchase      
Securities pledged more than repurchase agreements (as a percent) 2.00%    
Outstanding balance at end of period $ 204,021 $ 173,473  
Weighted average interest rate at end of period (as a percent) 0.31% 0.05%  
Fair Value of securities pledged $ 239,969 $ 203,074  
Average outstanding balance during the period $ 219,515 $ 280,296 $ 379,477
Average interest rate during the period (as a percent) 0.23% 0.02% 0.02%
Maximum outstanding at any month end during the period $ 293,944 $ 367,373 $ 442,981
Securities sold under agreements to repurchase | U.S. Treasury securities and U.S. Government agencies      
Securities sold under agreements to repurchase      
Fair Value of securities pledged 71,824 116,025  
Securities sold under agreements to repurchase | Mortgage backed securities - residential      
Securities sold under agreements to repurchase      
Fair Value of securities pledged 83,452 45,894  
Securities sold under agreements to repurchase | Collateralized mortgage obligations      
Securities sold under agreements to repurchase      
Fair Value of securities pledged $ 84,693 $ 41,155