ALLOWANCE FOR LOAN LOSSES: (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Balance, beginning of year	$ 6,196	$ 6,072	$ 6,072
Charge Offs	(681)		(1,105)
Recoveries	124		779
Provision for loan losses	63		450
Balance, End of period	5,702		6,196
Real Estate [Member]
Balance, beginning of year	5,101	5,016	5,016
Charge Offs	(140)		(943)
Recoveries	93		602
Provision for loan losses	(166)		426
Balance, End of period	4,888		5,101
Commercial Real Estate [Member]
Balance, beginning of year	660	163	163
Charge Offs	(515)		(11)
Recoveries	8		153
Provision for loan losses	426		355
Balance, End of period	579		660
Commercial Real Estate [Member] \| Real Estate [Member]
Balance, beginning of year	1,989	1,625	1,625
Charge Offs			(179)
Recoveries	8		193
Provision for loan losses	(156)		350
Balance, End of period	1,841		1,989
Construction and Land Development \| Real Estate [Member]
Balance, beginning of year	191	346	346
Charge Offs	(96)		(1)
Recoveries
Provision for loan losses	59		(154)
Balance, End of period	154		191
Residential 1-4 Family \| Real Estate [Member]
Balance, beginning of year	2,400	2,376	2,376
Charge Offs	(44)		(714)
Recoveries	29		48
Provision for loan losses	(19)		690
Balance, End of period	2,366		2,400
Multifamily \| Real Estate [Member]
Balance, beginning of year	106	241	241
Charge Offs
Recoveries
Provision for loan losses	(2)		(135)
Balance, End of period	104		106
Farmland \| Real Estate [Member]
Balance, beginning of year	415	428	428
Charge Offs			(49)
Recoveries	56		361
Provision for loan losses	(48)		(325)
Balance, End of period	423		415
Agriculture
Balance, beginning of year	20	31	31
Charge Offs			(4)
Recoveries			5
Provision for loan losses	6		(12)
Balance, End of period	26		20
Consumer Installment Loans
Balance, beginning of year	156	123	123
Charge Offs	(26)		(147)
Recoveries	23		19
Provision for loan losses			161
Balance, End of period	153		156
Other Loans
Balance, beginning of year	3
Charge Offs
Recoveries
Provision for loan losses	17		3
Balance, End of period	20		3
Unallocated
Balance, beginning of year	256	$ 739	739
Charge Offs
Recoveries
Provision for loan losses	(220)		(483)
Balance, End of period	$ 36		$ 256

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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