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, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Loans Receivable
Provision for Loan Losses Expensed		$ 314	$ 642	$ 995	$ 1,511
Allowance for Loan and Lease Losses, Write-offs		(84)	(140)	(196)	(193)
Allowance for Doubtful Accounts Receivable, Recoveries		3	8	10	11
Loans Receivable | Beginning of period
Allowance for Loan Losses		18,790	16,357	18,214	15,538
Loans Receivable | End of period
Allowance for Loan Losses	$ 18,214	19,023	16,867	19,023	16,867
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	750	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	17,464	19,023	16,867	19,023	16,867
Financing Receivables Allowance for Credit Losses Acquired with Deteriorated Credit Quality	0			0	0
Financing Receivable, Individually Evaluated for Impairment	1,240	0		0
Financing Receivable, Collectively Evaluated for Impairment	1,565,783	1,791,942		1,791,942
Financing Receivables Acquired with Deteriorated Credit Quality	14,571			28,561
Consumer Loan
Provision for Loan Losses Expensed		(11)	40	80	125
Allowance for Loan and Lease Losses, Write-offs		(3)	(28)	(20)	(58)
Allowance for Doubtful Accounts Receivable, Recoveries		0	1	5	4
Consumer Loan | Beginning of period
Allowance for Loan Losses		981	815	902	757
Consumer Loan | End of period
Allowance for Loan Losses	902	967	828	967	828
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	902	967	828	967	828
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	78,571	86,920		86,920
Financing Receivables Acquired with Deteriorated Credit Quality	0			0
Commercial Loan
Provision for Loan Losses Expensed		(150)	(49)	87	60
Allowance for Loan and Lease Losses, Write-offs		(47)	(21)	(47)	(21)
Allowance for Doubtful Accounts Receivable, Recoveries		0	6	1	6
Commercial Loan | Beginning of period
Allowance for Loan Losses		4,434	3,628	4,196	3,519
Commercial Loan | End of period
Allowance for Loan Losses	4,196	4,237	3,564	4,237	3,564
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	351	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	3,845	4,237	3,564	4,237	3,564
Financing Receivables Allowance for Credit Losses Acquired with Deteriorated Credit Quality	0			0	0
Financing Receivable, Individually Evaluated for Impairment	580	0		0
Financing Receivable, Collectively Evaluated for Impairment	278,241	339,895		339,895
Financing Receivables Acquired with Deteriorated Credit Quality	2,451			5,908
Construction Loan Payable
Provision for Loan Losses Expensed		(102)	(79)	94	(78)
Allowance for Loan and Lease Losses, Write-offs		0	0	0	0
Allowance for Doubtful Accounts Receivable, Recoveries		0	0	0	0
Construction Loan Payable | Beginning of period
Allowance for Loan Losses		1,293	965	1,097	964
Construction Loan Payable | End of period
Allowance for Loan Losses	1,097	1,191	886	1,191	886
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	1,097	1,191	886	1,191	886
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	64,888	68,344		68,344
Financing Receivables Acquired with Deteriorated Credit Quality	1,297			1,292
Residential Real Estate
Provision for Loan Losses Expensed		293	40	415	133
Allowance for Loan and Lease Losses, Write-offs		(9)	(55)	(9)	(78)
Allowance for Doubtful Accounts Receivable, Recoveries		0	1	1	1
Residential Real Estate | Beginning of period
Allowance for Loan Losses		3,349	3,300	3,226	3,230
Residential Real Estate | End of period
Allowance for Loan Losses	3,226	3,633	3,286	3,633	3,286
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	3,226	3,633	3,286	3,633	3,286
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	447,706	478,389		478,389
Financing Receivables Acquired with Deteriorated Credit Quality	3,213			1,838
Commercial Real Estate
Provision for Loan Losses Expensed		284	690	319	1,271
Allowance for Loan and Lease Losses, Write-offs		(25)	(36)	(120)	(36)
Allowance for Doubtful Accounts Receivable, Recoveries		3	0	3	0
Commercial Real Estate | Beginning of period
Allowance for Loan Losses		8,733	7,649	8,793	7,068
Commercial Real Estate | End of period
Allowance for Loan Losses	8,793	8,995	8,303	8,995	8,303
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	399	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	8,394	8,995	$ 8,303	8,995	8,303
Financing Receivables Allowance for Credit Losses Acquired with Deteriorated Credit Quality	0			0	$ 0
Financing Receivable, Individually Evaluated for Impairment	660	0		0
Financing Receivable, Collectively Evaluated for Impairment	696,377	$ 818,394		818,394
Financing Receivables Acquired with Deteriorated Credit Quality	$ 7,610			$ 19,523