Note 26: Condensed Parent Company Statements: Condensed Income Statement -- Great Southern Bancorp, Inc. (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest Expense	$ 54,602	$ 37,757	$ 27,905
Parent Company
Dividends from subsidiary bank	32,000	34,000	17,500
Other Interest and Dividend Income	0	0	48
Gain on Redemption of Trust Preferred Securities	(23)	0	0
Total income	31,977	34,000	17,548
Operating Expenses	2,044	1,793	1,330
Interest Expense	5,397	5,050	5,047
Total expense	7,441	6,843	6,377
Income before income tax and equity in undistributed earnings of subsidiaries	24,536	27,157	11,171
Income Tax Credits and Adjustments	(1,381)	(1,204)	(1,709)
Income before equity in earnings of subsidiaries	25,917	28,361	12,880
Equity in undistributed earnings of subsidiaries	47,695	38,748	38,684
Net income parent company	$ 73,612	$ 67,109	$ 51,564