ALLOWANCE FOR LOAN LOSSES: (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2018	Dec. 31, 2017
Balance, beginning of year	$ 6,196	$ 6,072
Charge Offs	(1,249)	(1,105)
Recoveries	215	779
Provision for loan losses	126	450
Balance, End of period	5,288	6,196
Commercial Real Estate [Member]
Balance, beginning of year	660	163
Charge Offs	(597)	(11)
Recoveries	24	153
Provision for loan losses	310	355
Balance, End of period	397	660
Unallocated
Balance, beginning of year	256	739
Charge Offs
Provision for loan losses	8	(483)
Balance, End of period	264	256
Agriculture
Balance, beginning of year	20	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
Charge Offs	(37)	(147)
Recoveries	24	19
Provision for loan losses	(5)	161
Balance, End of period	138	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
Charge Offs	(615)	(943)
Recoveries	166	602
Provision for loan losses	(199)	426
Balance, End of period		5,101
Real Estate [Member] \| Commercial Real Estate [Member]
Balance, beginning of year	1,989	163
Charge Offs	(334)	(179)
Recoveries	68	193
Provision for loan losses	(218)	350
Balance, End of period	1,505	1,989
Real Estate [Member] \| Construction and Land Development
Balance, beginning of year	191	5,016
Charge Offs	(96)	(1)
Provision for loan losses	151	(154)
Balance, End of period	246	191
Real Estate [Member] \| Residential 1-4 Family
Balance, beginning of year	2,400	5,016
Charge Offs	(167)	(714)
Recoveries	38	48
Provision for loan losses	18	690
Balance, End of period	2,289	2,400
Real Estate [Member] \| Multifamily
Balance, beginning of year	106	5,016
Charge Offs
Provision for loan losses	(7)	(135)
Balance, End of period	99	106
Real Estate [Member] \| Farmland
Balance, beginning of year	415	5,016
Charge Offs	(18)	(49)
Recoveries	60	361
Provision for loan losses	(143)	(325)
Balance, End of period	$ 314	$ 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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