Note 4: Acquired Loans, Loss Sharing Agreements and FDIC Indemnification Assets: FDIC Indemnification Asset Roll Forward (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
TeamBank Loans
Initial basis for loss sharing determination, net of activity since acquisition date	$ 10,602	$ 13,668
Reclassification from nonaccretable discount to accretable discount due to change in expected losses (net of accretion to date)	(399)	(589)
Original estimated fair value of assets, net of activity since acquisition date	(10,106)	(12,948)
Expected loss remaining	97	131
TeamBank Foreclosed Assets
Initial basis for loss sharing determination, net of activity since acquisition date	0	35
Reclassification from nonaccretable discount to accretable discount due to change in expected losses (net of accretion to date)	0	0
Original estimated fair value of assets, net of activity since acquisition date	0	(35)
Expected loss remaining	0	0
Vantus Bank Loans
Initial basis for loss sharing determination, net of activity since acquisition date	14,097	18,965
Reclassification from nonaccretable discount to accretable discount due to change in expected losses (net of accretion to date)	(58)	(131)
Original estimated fair value of assets, net of activity since acquisition date	(13,809)	(18,605)
Expected loss remaining	230	229
Vantus Bank Foreclosed Assets
Initial basis for loss sharing determination, net of activity since acquisition date	0	15
Reclassification from nonaccretable discount to accretable discount due to change in expected losses (net of accretion to date)	0	0
Original estimated fair value of assets, net of activity since acquisition date	0	(15)
Expected loss remaining	0	0
Sun Security Bank Loans
Initial basis for loss sharing determination, net of activity since acquisition date	21,171	26,787
Reclassification from nonaccretable discount to accretable discount due to change in expected losses (net of accretion to date)	(342)	(494)
Original estimated fair value of assets, net of activity since acquisition date	(20,171)	(25,348)
Expected loss remaining	658	945
Sun Security Bank Foreclosed Assets
Initial basis for loss sharing determination, net of activity since acquisition date	91	306
Reclassification from nonaccretable discount to accretable discount due to change in expected losses (net of accretion to date)	0	0
Original estimated fair value of assets, net of activity since acquisition date	(61)	(299)
Expected loss remaining	30	7
InterBank Loans
Initial basis for loss sharing determination, net of activity since acquisition date	85,106	112,399
Reclassification from nonaccretable discount to accretable discount due to change in expected losses (net of accretion to date)	(1,695)	(972)
Original estimated fair value of assets, net of activity since acquisition date	(74,436)	(98,321)
Expected loss remaining	9,074	13,380
Non-credit premium (discount), net of activity since acquisition date	99	274
InterBank Foreclosed Assets
Initial basis for loss sharing determination, net of activity since acquisition date	121	2,012
Reclassification from nonaccretable discount to accretable discount due to change in expected losses (net of accretion to date)	0	0
Original estimated fair value of assets, net of activity since acquisition date	(106)	(1,785)
Expected loss remaining	15	227
Non-credit premium (discount), net of activity since acquisition date	0	0
Valley Bank Loans
Initial basis for loss sharing determination, net of activity since acquisition date	53,470	59,997
Reclassification from nonaccretable discount to accretable discount due to change in expected losses (net of accretion to date)	(169)	(411)
Original estimated fair value of assets, net of activity since acquisition date	(49,124)	(54,442)
Expected loss remaining	4,177	5,155
Non-credit premium (discount), net of activity since acquisition date		11
Valley Bank Foreclosed Assets
Initial basis for loss sharing determination, net of activity since acquisition date	1,233	1,673
Reclassification from nonaccretable discount to accretable discount due to change in expected losses (net of accretion to date)	0	0
Original estimated fair value of assets, net of activity since acquisition date	(1,233)	(1,667)
Expected loss remaining	$ 0	6
Non-credit premium (discount), net of activity since acquisition date		$ 0