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SECURITIES - Securities Available for Sale (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Amortized cost and estimated fair value of securities available for sale [Abstract]        
Amortized Cost   $ 262,901,000   $ 248,496,000
Unrealized Gains   5,049,000   226,000
Unrealized Losses   421,000   6,464,000
Estimated Fair Value   267,529,000   242,258,000
Amortized Cost [Abstract]        
Within one year   3,413,000    
After one, but within five years   7,464,000    
After five, but within ten years   33,446,000    
After ten years   1,049,000    
Total   45,372,000    
Amortized Cost   262,901,000   248,496,000
Fair Value [Abstract]        
Within one year   3,421,000    
After one, but within five years   7,722,000    
After five, but within ten years   35,285,000    
After ten years   1,092,000    
Total   47,520,000    
Estimated Fair Value   267,529,000   242,258,000
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]        
Proceeds $ 0 15,200,000 $ 0  
Gross gains   79,000 0  
Gross losses   (60,000) 0  
Tax expense   5,000 $ 0  
Obligations of U.S. Government and U.S. Government sponsored enterprises        
Amortized cost and estimated fair value of securities available for sale [Abstract]        
Amortized Cost       5,489,000
Unrealized Gains       10,000
Unrealized Losses       27,000
Estimated Fair Value       5,472,000
Amortized Cost [Abstract]        
Amortized Cost       5,489,000
Fair Value [Abstract]        
Estimated Fair Value       5,472,000
Mortgage-backed securities, residential        
Amortized cost and estimated fair value of securities available for sale [Abstract]        
Amortized Cost   201,152,000   189,111,000
Unrealized Gains   2,757,000   146,000
Unrealized Losses   385,000   6,065,000
Estimated Fair Value   203,524,000   183,192,000
Amortized Cost [Abstract]        
Without single maturity date   201,152,000    
Amortized Cost   201,152,000   189,111,000
Fair Value [Abstract]        
Without single maturity date   203,524,000    
Estimated Fair Value   203,524,000   183,192,000
Obligations of states and political subdivisions        
Amortized cost and estimated fair value of securities available for sale [Abstract]        
Amortized Cost   45,122,000   44,390,000
Unrealized Gains   2,148,000   70,000
Unrealized Losses   0   308,000
Estimated Fair Value   47,270,000   44,152,000
Amortized Cost [Abstract]        
Amortized Cost   45,122,000   44,390,000
Fair Value [Abstract]        
Estimated Fair Value   47,270,000   44,152,000
Corporate bonds and notes        
Amortized cost and estimated fair value of securities available for sale [Abstract]        
Amortized Cost   250,000   249,000
Unrealized Gains   0   0
Unrealized Losses   0   2,000
Estimated Fair Value   250,000   247,000
Amortized Cost [Abstract]        
Amortized Cost   250,000   249,000
Fair Value [Abstract]        
Estimated Fair Value   250,000   247,000
SBA loan pools        
Amortized cost and estimated fair value of securities available for sale [Abstract]        
Amortized Cost   16,377,000   9,257,000
Unrealized Gains   144,000   0
Unrealized Losses   36,000   62,000
Estimated Fair Value   16,485,000   9,195,000
Amortized Cost [Abstract]        
Without single maturity date   16,377,000    
Amortized Cost   16,377,000   9,257,000
Fair Value [Abstract]        
Without single maturity date   16,485,000    
Estimated Fair Value   $ 16,485,000   $ 9,195,000