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PARENT COMPANY AND REGULATORY RESTRICTIONS (Condensed Balance Sheets) (Parenthetical) (Details) - $ / shares
Dec. 31, 2017
Dec. 31, 2016
Condensed Financial Statement    
Preferred stock, par value (in dollars per share) $ 0 $ 0
Preferred stock, authorized shares 1,000,000 1,000,000
Preferred stock, issued shares 0 0
Preferred stock, outstanding shares 0 0
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, authorized shares 185,000,000 185,000,000
Common stock, issued shares 30,024,222 30,796,243
Common stock, outstanding shares 30,024,222 30,796,243
Parent    
Condensed Financial Statement    
Preferred stock, par value (in dollars per share) $ 0 $ 0
Preferred stock, authorized shares 1,000,000 1,100,000
Preferred stock, issued shares 0 0
Preferred stock, outstanding shares 0 0
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, authorized shares 185,000,000 185,000,000
Common stock, issued shares 30,024,222 30,796,243
Common stock, outstanding shares 30,024,222 30,796,243