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FAIR VALUE OF ASSETS AND LIABILITIES (Level 3 Assets and Liabilities) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
bond
Dec. 31, 2016
USD ($)
States and political subdivisions    
Changes in Level 3 assets and liabilities measured at fair value on a recurring basis    
Principal payments received $ (358) $ (338)
Purchases 0
Unrealized net loss included in other comprehensive gain (44) 55
Mortgage revenue bonds    
Changes in Level 3 assets and liabilities measured at fair value on a recurring basis    
Aggregate fair value / Balance at the beginning of the period 12,196 12,479
Aggregate fair value / Balance at the end of the period $ 11,794 $ 12,196
Additional disclosures    
Number of investment securities held | bond 4  
Mortgage revenue bonds | Weighted average    
Additional disclosures    
Discount rate 4.81%