Note 28: Condensed Parent Company Statements: Condensed Cash Flow Statement -- Great Southern Bancorp, Inc. (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Gain on Redemption of Trust Preferred Securities		$ (1,115)
Amortization of interest rate derivative	$ 289	204	$ 19
Prepaid expenses and other assets	12,655	3,982	8,430
Net cash provided by operating activities	80,055	71,429	67,433
Proceeds from sale of available-for-sale securities	55,000	56,169	220,169
Net cash provided by (used in) investing activities	(198,146)	(196,195)	35,870
Redemption of preferred stock		(57,943)
Redemption of Trust Preferred Securities		(3,885)
Net cash provided by (used in) financing activities	198,677	105,302	(112,581)
Statements of Cash Flows | Parent Company
Cash, Period Increase (Decrease)	17,707	(44,827)	25,871
Cash beginning of period	20,009	64,836	38,965
Cash end of period	37,716	20,009	64,836
Statements of Cash Flows | Parent Company | Operating Activities
Operating Activity Net Income Parent Company	45,342	46,502	43,529
Net cash provided by operating activities	10,776	25,913	35,182
Statements of Cash Flows | Parent Company | Operating Activities | Items not requiring (providing) cash
Increase (Decrease) Equity in Undistributed Earnings of Subsidiaries	(34,067)	(19,850)	(8,904)
Compensation expense for stock option grants	483	382	565
Gain on Redemption of Trust Preferred Securities		(1,115)
Net realized gains on sales of non-marketable securities		(301)
Net realized gains on sales of available-for-sale securities	(2,735)
Statements of Cash Flows | Parent Company | Operating Activities | Changes in
Prepaid expenses and other assets	175	(27)	(3)
Accounts Payable and Other Accrued Liabilities	1,495	63	(67)
Income taxes parent	(206)	55	43
Statements of Cash Flows | Parent Company | Investing Activities
Proceeds from sale of available-for-sale securities	3,583
Investment in Subsidiary	(60,000)
Investment/Return of principal - other investments	(2)	16	20
Net cash provided by (used in) investing activities	(56,419)	16	20
Statements of Cash Flows | Parent Company | Financing Activities
Payments for Derivative Instrument, Financing Activities	73,472
Redemption of preferred stock		(57,943)
Redemption of Trust Preferred Securities		(3,885)
Payments for Repurchase of Warrants			(512)
Dividends, Paid-in-kind	(12,232)	(12,290)	(11,257)
Stock options excercised	2,110	3,362	2,438
Net cash provided by (used in) financing activities	$ 63,350	$ (70,756)	$ (9,331)