NOTE 6: LOANS AND ALLOWANCE FOR LOAN LOSSES: Financing Receivable, Allowance for Credit Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Provision for Loan and Lease Losses	$ (1,600)	$ (1,950)	$ (3,550)	$ (3,900)
One-to-Four-Family Residential Construction
Financing Receivable, Credit Loss, Expense (Reversal)	805	63	1,163	487
Financing Receivable, Allowance for Credit Loss, Writeoff	(62)	(27)	(517)	(41)
Accounts Receivable, Allowance for Credit Loss, Recovery	24	89	35	173
One-to-Four-Family Residential Construction | Beginning of Period
Provision for Loan and Lease Losses	3,036	2,602	3,122	2,108
One-to-Four-Family Residential Construction | End of Period
Provision for Loan and Lease Losses	3,803	2,727	3,803	2,727
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	237		237		$ 694
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	3,490		3,490		2,392
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses	76		76		36
Financing Receivable, Individually Evaluated for Impairment	3,182		3,182		6,116
Financing Receivable, Collectively Evaluated for Impairment	485,111		485,111		433,209
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	84,909		84,909		93,841
Other Residential
Financing Receivable, Credit Loss, Expense (Reversal)	(1,683)	364	(960)	969
Financing Receivable, Allowance for Credit Loss, Writeoff	0	(75)	0	(331)
Accounts Receivable, Allowance for Credit Loss, Recovery	0	344	0	368
Other Residential | Beginning of Period
Provision for Loan and Lease Losses	5,436	3,212	4,713	2,839
Other Residential | End of Period
Provision for Loan and Lease Losses	3,753	3,845	3,753	3,845
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0		0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	3,720		3,720		4,681
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses	33		33		32
Financing Receivable, Individually Evaluated for Impairment	0		0		0
Financing Receivable, Collectively Evaluated for Impairment	796,341		796,341		784,894
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	12,448		12,448		12,790
Commercial Real Estate
Financing Receivable, Credit Loss, Expense (Reversal)	1,382	1,297	2,545	811
Financing Receivable, Allowance for Credit Loss, Writeoff	(7)	0	(7)	(102)
Accounts Receivable, Allowance for Credit Loss, Recovery	11	115	26	126
Commercial Real Estate | Beginning of Period
Provision for Loan and Lease Losses	20,981	18,062	19,803	18,639
Commercial Real Estate | End of Period
Provision for Loan and Lease Losses	22,367	19,474	22,367	19,474
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	555		555		613
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	21,645		21,645		18,958
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses	167		167		232
Financing Receivable, Individually Evaluated for Impairment	7,809		7,809		3,501
Financing Receivable, Collectively Evaluated for Impairment	1,438,357		1,438,357		1,367,934
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	31,083		31,083		33,620
Commercial Construction
Financing Receivable, Credit Loss, Expense (Reversal)	1,145	109	574	471
Financing Receivable, Allowance for Credit Loss, Writeoff	(189)	(46)	(220)	(83)
Accounts Receivable, Allowance for Credit Loss, Recovery	8	144	20	240
Commercial Construction | Beginning of Period
Provision for Loan and Lease Losses	2,515	2,188	3,105	1,767
Commercial Construction | End of Period
Provision for Loan and Lease Losses	3,479	2,395	3,479	2,395
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0		0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	3,290		3,290		3,029
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses	189		189		76
Financing Receivable, Individually Evaluated for Impairment	3,556		3,556		14
Financing Receivable, Collectively Evaluated for Impairment	1,433,634		1,433,634		1,461,644
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	4,739		4,739		4,093
Commercial Business
Financing Receivable, Credit Loss, Expense (Reversal)	62	(454)	(90)	28
Financing Receivable, Allowance for Credit Loss, Writeoff	(25)	(472)	(99)	(881)
Accounts Receivable, Allowance for Credit Loss, Recovery	157	222	299	263
Commercial Business | Beginning of Period
Provision for Loan and Lease Losses	1,484	3,695	1,568	3,581
Commercial Business | End of Period
Provision for Loan and Lease Losses	1,678	2,991	1,678	2,991
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	470		470		309
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,195		1,195		1,247
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses	13		13		12
Financing Receivable, Individually Evaluated for Impairment	1,451		1,451		1,844
Financing Receivable, Collectively Evaluated for Impairment	325,157		325,157		334,214
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	3,674		3,674		4,347
Consumer
Financing Receivable, Credit Loss, Expense (Reversal)	(111)	571	318	1,134
Financing Receivable, Allowance for Credit Loss, Writeoff	(1,699)	(2,112)	(3,905)	(4,934)
Accounts Receivable, Allowance for Credit Loss, Recovery	785	1,114	1,663	2,366
Consumer | Beginning of Period
Provision for Loan and Lease Losses	5,199	6,551	6,098	7,558
Consumer | End of Period
Provision for Loan and Lease Losses	4,174	6,124	4,174	6,124
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	155		155		425
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	3,992		3,992		5,640
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses	27		27		33
Financing Receivable, Individually Evaluated for Impairment	1,821		1,821		2,464
Financing Receivable, Collectively Evaluated for Impairment	371,419		371,419		429,766
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	14,841		14,841		18,960
Loans Receivable
Financing Receivable, Credit Loss, Expense (Reversal)	1,600	1,950	3,550	3,900
Financing Receivable, Allowance for Credit Loss, Writeoff	(1,982)	(2,732)	(4,748)	(6,372)
Accounts Receivable, Allowance for Credit Loss, Recovery	985	2,028	2,043	3,536
Loans Receivable | Beginning of Period
Provision for Loan and Lease Losses	38,651	36,310	38,409	36,492
Loans Receivable | End of Period
Provision for Loan and Lease Losses	39,254	$ 37,556	39,254	$ 37,556
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	1,417		1,417		2,041
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	37,332		37,332		35,947
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses	505		505		421
Financing Receivable, Individually Evaluated for Impairment	17,819		17,819		13,939
Financing Receivable, Collectively Evaluated for Impairment	4,850,019		4,850,019		4,811,661
All Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Not Accounted for Using Income Recognition Model	$ 151,694		$ 151,694		$ 167,651