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SECURITIES - Amortized cost and estimated fair values of investments in securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Available-for-sale Securities [Abstract]    
Amortized cost $ 223,668 $ 207,361
Fair Value 223,175 205,944
Held-to-maturity Securities [Abstract]    
Amortized cost 33 34
Fair Value 35 37
Securities available for sale:    
Available-for-sale Securities [Abstract]    
Amortized cost 223,668 207,361
Unrealized Gains 1,553 1,244
Unrealized Losses (2,046) (2,661)
Fair Value 223,175 205,944
Securities available for sale: | State and municipal securities    
Available-for-sale Securities [Abstract]    
Amortized cost 60,861 58,991
Unrealized Gains 1,173 638
Unrealized Losses (118) (650)
Fair Value 61,916 58,979
Securities available for sale: | Debt securities    
Available-for-sale Securities [Abstract]    
Amortized cost 17,315 20,795
Unrealized Losses (370) (454)
Fair Value 16,945 20,341
Securities available for sale: | Collateralized mortgage obligations    
Available-for-sale Securities [Abstract]    
Amortized cost 61,878 34,005
Unrealized Gains 50 90
Unrealized Losses (675) (325)
Fair Value 61,253 33,770
Securities available for sale: | Mortgage-backed securities    
Available-for-sale Securities [Abstract]    
Amortized cost 82,510 92,489
Unrealized Gains 330 516
Unrealized Losses (866) (1,215)
Fair Value 81,974 91,790
Securities available for sale: | Other securities    
Available-for-sale Securities [Abstract]    
Amortized cost 1,104 1,081
Unrealized Losses (17) (17)
Fair Value 1,087 1,064
Securities held to maturity: | Mortgage-backed securities    
Held-to-maturity Securities [Abstract]    
Amortized cost 33 34
Gross Unrealized Gains 2 3
Fair Value $ 35 $ 37