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LOANS - Loan participation and Loan Guarantees (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loans      
Participations purchased during the period $ 18,491,000   $ 6,771,000
Participations Sold During the Period 46,067,000 $ 4,948,000 26,755,000
SBA loans subject to sale of guaranteed portion, net of payments 2,200,000 3,500,000 3,600,000
Gain loss on disposition of asset      
Loans      
Net gains recognized on sales of loans 149,000 326,000 382,000
Commercial and industrial      
Loans      
Participations purchased during the period     1,674,000
Participations Sold During the Period 23,000,000    
Commercial real estate      
Loans      
Participations purchased during the period 12,885,000    
Participations Sold During the Period 20,505,000 654,000  
Construction and development      
Loans      
Participations purchased during the period 5,606,000   5,097,000
Participations Sold During the Period $ 2,562,000 $ 4,294,000 21,755,000
Loans to nondepository financial institutions      
Loans      
Participations Sold During the Period     $ 5,000,000