Note 4: Loans and Allowance for Loan Losses: Schedule of balance in the allowance for loan losses and recorded investment (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Residential Mortgage
Provision for Loan Losses Expensed		$ 40	$ 316	$ 133	$ 316
Allowance for Loan and Lease Losses, Write-offs		(55)	0	(78)	(97)
Allowance for Doubtful Accounts Receivable, Recoveries		1	3	1	6
Residential Mortgage | Beginning of period
Allowance for loan losses	$ 3,230	3,300	3,153	3,230	3,247
Residential Mortgage | End of period
Allowance for loan losses		3,286	3,472	3,286	3,472
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	3,230	3,286	3,472	3,286	3,472
Financing Receivables Allowance for Credit Losses Acquired with Deteriorated Credit Quality	0			0	0
Financing Receivable, Individually Evaluated for Impairment	0	0		0
Financing Receivable, Collectively Evaluated for Impairment	438,981	443,968		443,968
Financing Receivables Acquired with Deteriorated Credit Quality	3,482			3,433
Construction Loan Payable
Provision for Loan Losses Expensed		(79)	(200)	(78)	(170)
Allowance for Loan and Lease Losses, Write-offs		0	(31)	0	(31)
Allowance for Doubtful Accounts Receivable, Recoveries		0	1	0	1
Construction Loan Payable | Beginning of period
Allowance for loan losses	964	965	1,121	964	1,091
Construction Loan Payable | End of period
Allowance for loan losses		886	891	886	891
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	964	886	891	886	891
Financing Receivables Allowance for Credit Losses Acquired with Deteriorated Credit Quality	0			0	0
Financing Receivable, Individually Evaluated for Impairment	0	0		0
Financing Receivable, Collectively Evaluated for Impairment	54,704	52,231		52,231
Financing Receivables Acquired with Deteriorated Credit Quality	1,338			1,321
Commercial Real Estate
Provision for Loan Losses Expensed		690	465	1,271	1,124
Allowance for Loan and Lease Losses, Write-offs		(36)	0	(36)	0
Allowance for Doubtful Accounts Receivable, Recoveries		0	16	0	16
Commercial Real Estate | Beginning of period
Allowance for loan losses	7,068	7,649	6,370	7,068	5,711
Commercial Real Estate | End of period
Allowance for loan losses		8,303	6,851	8,303	6,851
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	7,068	8,303	6,851	8,303	6,851
Financing Receivables Allowance for Credit Losses Acquired with Deteriorated Credit Quality	0			0	0
Financing Receivable, Individually Evaluated for Impairment	0	0		0
Financing Receivable, Collectively Evaluated for Impairment	592,427	646,557		646,557
Financing Receivables Acquired with Deteriorated Credit Quality	11,495			9,439
Consumer Loan
Provision for Loan Losses Expensed		40	53	125	52
Allowance for Loan and Lease Losses, Write-offs		(28)	(35)	(58)	(39)
Allowance for Doubtful Accounts Receivable, Recoveries		1	0	4	5
Consumer Loan | Beginning of period
Allowance for loan losses	757	815	738	757	738
Consumer Loan | End of period
Allowance for loan losses		828	756	828	756
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	757	828	756	828	756
Financing Receivables Allowance for Credit Losses Acquired with Deteriorated Credit Quality	0			0	0
Financing Receivable, Individually Evaluated for Impairment	0	0		0
Financing Receivable, Collectively Evaluated for Impairment	63,651	66,725		66,725
Financing Receivables Acquired with Deteriorated Credit Quality	0			0
Commercial Loan
Provision for Loan Losses Expensed		(49)	22	60	259
Allowance for Loan and Lease Losses, Write-offs		(21)	(101)	(21)	(270)
Allowance for Doubtful Accounts Receivable, Recoveries		6	27	6	29
Commercial Loan | Beginning of period
Allowance for loan losses	3,519	3,628	3,074	3,519	3,004
Commercial Loan | End of period
Allowance for loan losses		3,564	3,022	3,564	3,022
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	3,519	3,564	3,022	3,564	3,022
Financing Receivables Allowance for Credit Losses Acquired with Deteriorated Credit Quality	0			0	0
Financing Receivable, Individually Evaluated for Impairment	0	0		0
Financing Receivable, Collectively Evaluated for Impairment	243,369	242,923		242,923
Financing Receivables Acquired with Deteriorated Credit Quality	3,815			3,242
Total loans
Provision for Loan Losses Expensed		642	656	1,511	1,581
Allowance for Loan and Lease Losses, Write-offs		(140)	(167)	(193)	(437)
Allowance for Doubtful Accounts Receivable, Recoveries		8	47	11	57
Total loans | Beginning of period
Allowance for loan losses	15,538	16,357	14,456	15,538	13,791
Total loans | End of period
Allowance for loan losses		16,867	14,992	16,867	14,992
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	15,538	16,867	$ 14,992	16,867	14,992
Financing Receivables Allowance for Credit Losses Acquired with Deteriorated Credit Quality	0			0	$ 0
Financing Receivable, Individually Evaluated for Impairment	0	0		0
Financing Receivable, Collectively Evaluated for Impairment	1,393,132	$ 1,452,404		1,452,404
Financing Receivables Acquired with Deteriorated Credit Quality	$ 20,130			$ 17,435