LOANS: (Details 4) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Loans 30-59 Days Past Due	$ 3,671	$ 5,565	$ 4,725
Loans 60-89 Days Past Due	655	800	3,149
Loans 90 or More Days Past Due	1,226	1,175	2,095
Total Past Due Loans	5,552	7,540	9,969
Current Loans	521,827	$ 508,823	503,039
Total loans and leases	527,379		513,008
Real Estate [Member]
Loans 30-59 Days Past Due	3,628		4,482
Loans 60-89 Days Past Due	532		3,109
Loans 90 or More Days Past Due	1,222		1,464
Total Past Due Loans	5,382		9,055
Current Loans	447,367		436,034
Total loans and leases	452,749		445,089
Commercial [Member]
Total loans and leases	48,034		41,345
Commercial [Member] | Real Estate [Member]
Loans 30-59 Days Past Due	542		190
Loans 60-89 Days Past Due			2,396
Loans 90 or More Days Past Due	317		453
Total Past Due Loans	859		3,039
Current Loans	137,990		124,649
Total loans and leases	138,849		127,688
Construction and Land Development | Real Estate [Member]
Loans 30-59 Days Past Due	32		69
Loans 60-89 Days Past Due	18		246
Loans 90 or More Days Past Due	42		42
Total Past Due Loans	92		357
Current Loans	27,519		29,406
Total loans and leases	27,611		29,763
Residential 1-4 Family | Real Estate [Member]
Loans 30-59 Days Past Due	2,251		3,789
Loans 60-89 Days Past Due	514		378
Loans 90 or More Days Past Due	618		969
Total Past Due Loans	3,383		5,136
Current Loans	246,946		244,023
Total loans and leases	250,329		249,159
Multifamily | Real Estate [Member]
Loans 30-59 Days Past Due	276		125
Loans 60-89 Days Past Due			89
Total Past Due Loans	276		214
Current Loans	13,481		15,267
Total loans and leases	13,757		15,481
Farmland | Real Estate [Member]
Loans 30-59 Days Past Due	527		309
Loans 90 or More Days Past Due	245
Total Past Due Loans	772		309
Current Loans	21,431		22,689
Total loans and leases	22,203		22,998
Commercial Real Estate [Member]
Loans 30-59 Days Past Due			103
Loans 60-89 Days Past Due	110		25
Loans 90 or More Days Past Due			603
Total Past Due Loans	110		731
Current Loans	47,924		40,614
Total loans and leases	48,034		41,345
Consumer Installment Loans
Loans 30-59 Days Past Due	43		102
Loans 60-89 Days Past Due	13		15
Loans 90 or More Days Past Due	4		28
Total Past Due Loans	60		145
Current Loans	21,415		22,266
Total loans and leases	21,475		22,411
Agriculture
Loans 30-59 Days Past Due			38
Total Past Due Loans			38
Current Loans	4,487		3,456
Total loans and leases	4,487		3,494
Other Loans
Current Loans	634		669
Total loans and leases	$ 634		$ 669