NOTE 6: LOANS AND ALLOWANCE FOR LOAN LOSSES: Allowance for Credit Losses on Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Provision for Loan and Lease Losses	$ 1,300	$ 2,950	$ 5,200	$ 7,150
One-to-Four-Family Residential Construction
Provision for Loan Losses Expensed	7	285	494	407
Financing Receivable, Allowance for Credit Losses, Write-downs	(18)	(74)	(59)	(150)
Allowance for Doubtful Accounts Receivable, Recoveries	79	46	252	91
One-to-Four-Family Residential Construction | Beginning of Period
Provision for Loan and Lease Losses	2,727	2,413	2,108	2,322
One-to-Four-Family Residential Construction | End of Period
Provision for Loan and Lease Losses	2,795	2,670	2,795	2,670
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	771		771		$ 513
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,987		1,987		1,564
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses	37				31
Financing Receivable, Individually Evaluated for Impairment	6,302		6,302		6,950
Financing Receivable, Collectively Evaluated for Impairment	400,505		400,505		341,888
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	98,702		98,702		120,295
Other Residential
Provision for Loan Losses Expensed	341	190	1,310	(1,708)
Financing Receivable, Allowance for Credit Losses, Write-downs	(194)	(10)	(525)	(12)
Allowance for Doubtful Accounts Receivable, Recoveries	41	89	409	158
Other Residential | Beginning of Period
Provision for Loan and Lease Losses	3,845	3,655	2,839	5,486
Other Residential | End of Period
Provision for Loan and Lease Losses	4,033	3,924	4,033	3,924
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0		0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	4,006		4,006		2,813
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses	27				26
Financing Receivable, Individually Evaluated for Impairment	0		0		2,907
Financing Receivable, Collectively Evaluated for Impairment	791,786		791,786		742,738
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	12,927		12,927		14,877
Commercial Real Estate
Provision for Loan Losses Expensed	708	643	1,519	1,413
Financing Receivable, Allowance for Credit Losses, Write-downs	0	(357)	(102)	(1,649)
Allowance for Doubtful Accounts Receivable, Recoveries	1	74	127	100
Commercial Real Estate | Beginning of Period
Provision for Loan and Lease Losses	19,474	15,442	18,639	15,938
Commercial Real Estate | End of Period
Provision for Loan and Lease Losses	20,183	15,802	20,183	15,802
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	635		635		599
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	19,288		19,288		17,843
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses	260				197
Financing Receivable, Individually Evaluated for Impairment	3,556		3,556		8,315
Financing Receivable, Collectively Evaluated for Impairment	1,380,315		1,380,315		1,227,014
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	35,980		35,980		39,210
Commercial Construction
Provision for Loan Losses Expensed	538	298	1,009	74
Financing Receivable, Allowance for Credit Losses, Write-downs	(4)	0	(87)	(386)
Allowance for Doubtful Accounts Receivable, Recoveries	97	129	337	166
Commercial Construction | Beginning of Period
Provision for Loan and Lease Losses	2,395	1,711	1,767	2,284
Commercial Construction | End of Period
Provision for Loan and Lease Losses	3,026	2,138	3,026	2,138
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0		0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	2,953		2,953		1,690
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses	73				77
Financing Receivable, Individually Evaluated for Impairment	14		14		15
Financing Receivable, Collectively Evaluated for Impairment	1,327,956		1,327,956		1,112,308
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	4,240		4,240		3,806
Commercial Business
Provision for Loan Losses Expensed	(1,019)	562	(991)	1,786
Financing Receivable, Allowance for Credit Losses, Write-downs	(274)	(1,090)	(1,155)	(1,365)
Allowance for Doubtful Accounts Receivable, Recoveries	80	66	343	467
Commercial Business | Beginning of Period
Provision for Loan and Lease Losses	2,991	4,365	3,581	3,015
Commercial Business | End of Period
Provision for Loan and Lease Losses	1,778	3,903	1,778	3,903
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	324		324		2,140
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,438		1,438		1,369
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses	16				72
Financing Receivable, Individually Evaluated for Impairment	2,008		2,008		3,018
Financing Receivable, Collectively Evaluated for Impairment	344,208		344,208		372,192
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	4,613		4,613		5,275
Consumer
Provision for Loan Losses Expensed	725	972	1,859	5,178
Financing Receivable, Allowance for Credit Losses, Write-downs	(2,128)	(3,151)	(7,062)	(9,120)
Allowance for Doubtful Accounts Receivable, Recoveries	961	1,038	3,327	3,393
Consumer | Beginning of Period
Provision for Loan and Lease Losses	6,124	8,947	7,558	8,355
Consumer | End of Period
Provision for Loan and Lease Losses	5,682	7,806	5,682	7,806
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	433		433		699
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	5,221		5,221		6,802
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses	28				57
Financing Receivable, Individually Evaluated for Impairment	2,524		2,524		4,129
Financing Receivable, Collectively Evaluated for Impairment	450,342		450,342		531,820
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	20,688		20,688		26,206
Loans Receivable
Provision for Loan Losses Expensed	1,300	2,950	5,200	7,150
Financing Receivable, Allowance for Credit Losses, Write-downs	(2,618)	(4,682)	(8,990)	(12,682)
Allowance for Doubtful Accounts Receivable, Recoveries	1,259	1,442	4,795	4,375
Loans Receivable | Beginning of Period
Provision for Loan and Lease Losses	37,556	36,533	36,492	37,400
Loans Receivable | End of Period
Provision for Loan and Lease Losses	37,497	$ 36,243	37,497	$ 36,243
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	2,163		2,163		3,951
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	34,893		34,893		32,081
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses	441				460
Financing Receivable, Individually Evaluated for Impairment	14,404		14,404		25,334
Financing Receivable, Collectively Evaluated for Impairment	4,695,112		4,695,112		4,327,960
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	$ 177,150		$ 177,150		$ 209,669