ALLOWANCE FOR LOAN LOSSES: (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Balance, beginning of year	$ 6,196	$ 6,072	$ 6,072
Charge Offs	(1,434)		(1,105)
Recoveries	329		779
Provision for loan losses	189		450
Balance, End of period	5,280		6,196
Commercial Real Estate [Member]
Balance, beginning of year	660	163	163
Charge Offs	(617)		(11)
Recoveries	77		153
Provision for loan losses	260		355
Balance, End of period	380		660
Unallocated
Balance, beginning of year	256	739	739
Charge Offs
Provision for loan losses	321		(483)
Balance, End of period	577		256
Agriculture
Balance, beginning of year	20	31	31
Charge Offs			(4)
Recoveries	1		5
Provision for loan losses	12		(12)
Balance, End of period	33		20
Consumer Installment Loans
Balance, beginning of year	156	123	123
Charge Offs	(59)		(147)
Recoveries	38		19
Provision for loan losses	16		161
Balance, End of period	151		156
Other Loans
Balance, beginning of year	3
Charge Offs
Provision for loan losses			3
Balance, End of period	3		3
Real Estate [Member]
Balance, beginning of year	5,101	5,016	5,016
Charge Offs	(758)		(943)
Recoveries	213		602
Provision for loan losses	(420)		426
Balance, End of period	4,136		5,101
Real Estate [Member] \| Commercial Real Estate [Member]
Balance, beginning of year	1,989	163	163
Charge Offs	(334)		(179)
Recoveries	73		193
Provision for loan losses	(345)		350
Balance, End of period	1,383		1,989
Real Estate [Member] \| Construction and Land Development
Balance, beginning of year	191	346	346
Charge Offs	(96)		(1)
Recoveries	12
Provision for loan losses	64		(154)
Balance, End of period	171		191
Real Estate [Member] \| Residential 1-4 Family
Balance, beginning of year	2,400	2,376	2,376
Charge Offs	(270)		(714)
Recoveries	62		48
Provision for loan losses	17		690
Balance, End of period	2,209		2,400
Real Estate [Member] \| Multifamily
Balance, beginning of year	106	241	241
Charge Offs
Provision for loan losses	(15)		(135)
Balance, End of period	91		106
Real Estate [Member] \| Farmland
Balance, beginning of year	415	$ 428	428
Charge Offs	(58)		(49)
Recoveries	66		361
Provision for loan losses	(141)		(325)
Balance, End of period	$ 282		$ 415

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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