NOTE 7: ACQUIRED LOANS, LOSS SHARING AGREEMENTS AND FDIC INDEMNIFICATION ASSETS: Schedule of Accretable Yield Changes for Acquired Loans (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2020		Jun. 30, 2019
TeamBank
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	$ (114)		$ (180)		$ (239)		$ (615)
Change in expected accretable yield	(46)	[1]	131	[1]	0	[2]	609	[2]
TeamBank | Beginning of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	1,078		1,399		1,157		1,356
TeamBank | End of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	918		1,350		918		1,350
Vantus Bank
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	(189)		(261)		(420)		(478)
Change in expected accretable yield	57	[1]	186	[1]	251	[2]	273	[2]
Vantus Bank | Beginning of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	1,086		1,302		1,123		1,432
Vantus Bank | End of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	954		1,227		954		1,227
Sun Security Bank
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	(266)		(340)		(592)		(781)
Change in expected accretable yield	(121)	[1]	(245)	[1]	537	[2]	398	[2]
Sun Security Bank | Beginning of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	2,280		2,444		1,948		2,242
Sun Security Bank | End of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	1,893		1,859		1,893		1,859
InterBank
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	(1,857)		(1,951)		(3,963)		(3,979)
Change in expected accretable yield	752	[1]	2,468	[1]	938	[2]	7,450	[2]
InterBank | Beginning of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	6,357		7,948		8,277		4,994
InterBank | End of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	5,252		8,465		5,252		8,465
Valley Bank
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	(833)		(1,132)		(1,740)		(1,985)
Change in expected accretable yield	344	[1]	2,347	[1]	1,285	[2]	4,466	[2]
Valley Bank | Beginning of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	4,612		4,329		4,578		3,063
Valley Bank | End of Period
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	$ 4,123		$ 5,544		$ 4,123		$ 5,544

[1] Represents increases (decreases) in estimated cash flows expected to be received from the acquired loan pools, partially due to lower estimated credit losses.  The amounts also include changes in expected accretion of the loan pools for TeamBank, Vantus Bank, Sun Security Bank, InterBank and Valley Bank for the three months ended June 30, 2020, totaling $(46,000), $57,000, $(121,000), $752,000 and $344,000, respectively, and for the three months ended June 30, 2019, totaling $68,000, $186,000, $(336,000), $468,000 and $839,000, respectively.  

[2] Represents increases (decreases) in estimated cash flows expected to be received from the acquired loan pools, partially due to lower estimated credit losses.  The amounts also include changes in expected accretion of the loan pools for TeamBank, Vantus Bank, Sun Security Bank, InterBank and Valley Bank for the six months ended June 30, 2020, totaling $0, $251,000, $537,000, $938,000 and $1.3 million, respectively, and for the six months ended June 30, 2019, totaling $546,000, $273,000, $247,000, $4.6 million and $2.2 million, respectively.