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DEBT SECURITIES - Amortized cost and estimated fair values of investments in securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Available-for-sale Securities [Abstract]    
Amortized cost $ 229,515 $ 223,668
Fair Value 222,462 223,175
Held-to-maturity Securities [Abstract]    
Amortized cost 31 33
Fair Value 33 35
Securities Available for Sale    
Available-for-sale Securities [Abstract]    
Amortized cost 229,515 223,668
Unrealized Gains 222 1,553
Unrealized Losses (7,275) (2,046)
Fair Value 222,462 223,175
Securities Available for Sale | State and municipal securities    
Available-for-sale Securities [Abstract]    
Amortized cost 56,155 60,861
Unrealized Gains 119 1,173
Unrealized Losses (1,150) (118)
Fair Value 55,124 61,916
Securities Available for Sale | Debt securities    
Available-for-sale Securities [Abstract]    
Amortized cost 17,315 17,315
Unrealized Losses (628) (370)
Fair Value 16,687 16,945
Securities Available for Sale | Collateralized mortgage obligations    
Available-for-sale Securities [Abstract]    
Amortized cost 66,737 61,878
Unrealized Gains 8 50
Unrealized Losses (2,206) (675)
Fair Value 64,539 61,253
Securities Available for Sale | Mortgage-backed securities    
Available-for-sale Securities [Abstract]    
Amortized cost 88,185 82,510
Unrealized Gains 95 330
Unrealized Losses (3,239) (866)
Fair Value 85,041 81,974
Securities Available for Sale | Other securities    
Available-for-sale Securities [Abstract]    
Amortized cost 1,123 1,104
Unrealized Losses (52) (17)
Fair Value 1,071 1,087
Securities Held to Maturity | Mortgage-backed securities    
Held-to-maturity Securities [Abstract]    
Amortized cost 31 33
Gross Unrealized Gains 2 2
Fair Value $ 33 $ 35