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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

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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