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Regulatory Matters - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Total capital Member | Great Southern Bancorp, Inc. Member
Actual Capital Amount	$ 800,388	$ 698,085
Actual Capital Ratio	17.20%	15.00%
Capital Required for Capital Adequacy	$ 373,132	$ 372,387
Capital Required for Capital Adequacy to Risk Weighted Assets	8.0	8.0
Total capital Member | Great Southern Bank Member
Actual Capital Amount	$ 694,047	$ 650,280
Actual Capital Ratio	14.90%	14.00%
Capital Required for Capital Adequacy	$ 373,058	$ 372,316
Capital Required for Capital Adequacy to Risk Weighted Assets	8.0	8.0
Capital Required to be Well Capitalized	$ 466,322	$ 465,395
Capital Required to be Well Capitalized to Risk Weighted Assets	10.0	10.0
Tier I capital Member | Great Southern Bancorp, Inc. Member
Actual Capital Amount	$ 594,645	$ 582,791
Actual Capital Ratio	12.70%	12.50%
Capital Required for Capital Adequacy	$ 279,849	$ 279,290
Capital Required for Capital Adequacy to Risk Weighted Assets	6.0	6.0
Tier I capital Member | Great Southern Bank Member
Actual Capital Amount	$ 638,304	$ 609,986
Actual Capital Ratio	13.70%	13.10%
Capital Required for Capital Adequacy	$ 279,793	$ 279,237
Capital Required for Capital Adequacy to Risk Weighted Assets	6.0	6.0
Capital Required to be Well Capitalized	$ 373,058	$ 372,316
Capital Required to be Well Capitalized to Risk Weighted Assets	8.0	8.0
Tier I leverage capital Member | Great Southern Bancorp, Inc. Member
Actual Capital Amount	$ 594,645	$ 582,791
Actual Capital Ratio	10.90%	11.80%
Capital Required for Capital Adequacy	$ 217,223	$ 198,320
Capital Required for Capital Adequacy to Risk Weighted Assets	4.0	4.0
Tier I leverage capital Member | Great Southern Bank Member
Actual Capital Amount	$ 638,304	$ 609,986
Actual Capital Ratio	11.80%	12.30%
Capital Required for Capital Adequacy	$ 217,170	$ 198,010
Capital Required for Capital Adequacy to Risk Weighted Assets	4.0	4.0
Capital Required to be Well Capitalized	$ 271,463	$ 247,512
Capital Required to be Well Capitalized to Risk Weighted Assets	5.0	5.0
Common equity Tier I capital Member | Great Southern Bancorp, Inc. Member
Actual Capital Amount	$ 569,645	$ 557,791
Actual Capital Ratio	12.20%	12.00%
Capital Required for Capital Adequacy	$ 209,887	$ 209,468
Capital Required for Capital Adequacy to Risk Weighted Assets	4.5	4.5
Common equity Tier I capital Member | Great Southern Bank Member
Actual Capital Amount	$ 638,304	$ 609,986
Actual Capital Ratio	13.70%	13.10%
Capital Required for Capital Adequacy	$ 209,845	$ 209,428
Capital Required for Capital Adequacy to Risk Weighted Assets	4.5	4.5
Capital Required to be Well Capitalized	$ 303,109	$ 302,507
Capital Required to be Well Capitalized to Risk Weighted Assets	6.5	6.5

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Amount of minimum total risk-based capital required for capital adequacy as defined by regulatory framework.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
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