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DEBT SECURITIES - Amortized cost and estimated fair values of investments in securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Available-for-sale Securities [Abstract]    
Amortized cost $ 235,480 $ 223,668
Fair Value 230,361 223,175
Held-to-maturity Securities [Abstract]    
Amortized cost 32 33
Fair Value 34 35
Securities Available for Sale    
Available-for-sale Securities [Abstract]    
Amortized cost 235,480 223,668
Unrealized Gains 583 1,553
Unrealized Losses (5,702) (2,046)
Fair Value 230,361 223,175
Securities Available for Sale | State and municipal securities    
Available-for-sale Securities [Abstract]    
Amortized cost 61,355 60,861
Unrealized Gains 413 1,173
Unrealized Losses (660) (118)
Fair Value 61,108 61,916
Securities Available for Sale | Debt securities    
Available-for-sale Securities [Abstract]    
Amortized cost 17,315 17,315
Unrealized Losses (584) (370)
Fair Value 16,731 16,945
Securities Available for Sale | Collateralized mortgage obligations    
Available-for-sale Securities [Abstract]    
Amortized cost 67,554 61,878
Unrealized Gains 17 50
Unrealized Losses (1,747) (675)
Fair Value 65,824 61,253
Securities Available for Sale | Mortgage-backed securities    
Available-for-sale Securities [Abstract]    
Amortized cost 88,140 82,510
Unrealized Gains 153 330
Unrealized Losses (2,668) (866)
Fair Value 85,625 81,974
Securities Available for Sale | Other securities    
Available-for-sale Securities [Abstract]    
Amortized cost 1,116 1,104
Unrealized Losses (43) (17)
Fair Value 1,073 1,087
Securities Held to Maturity | Mortgage-backed securities    
Held-to-maturity Securities [Abstract]    
Amortized cost 32 33
Gross Unrealized Gains 2 2
Fair Value $ 34 $ 35