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Note 23: Regulatory Matters: Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Total capital | Great Southern Bancorp, Inc.    
Actual Capital Amount $ 698,085 $ 651,469
Actual Capital Ratio 15.00% 14.40%
Capital Required for Capital Adequacy $ 372,387 $ 360,826
Capital Required for Capital Adequacy to Risk Weighted Assets 8.00% 8.00%
Total capital | Great Southern Bank    
Actual Capital Amount $ 650,280 $ 599,509
Actual Capital Ratio 14.00% 13.30%
Capital Required for Capital Adequacy $ 372,316 $ 360,767
Capital Required for Capital Adequacy to Risk Weighted Assets 8.00% 8.00%
Capital Required to be Well Capitalized $ 465,395 $ 450,959
Capital Required to be Well Capitalized to Risk Weighted Assets 10.00% 10.00%
Tier I capital | Great Southern Bancorp, Inc.    
Actual Capital Amount $ 582,791 $ 538,060
Actual Capital Ratio 12.50% 11.90%
Capital Required for Capital Adequacy $ 279,290 $ 270,619
Capital Required for Capital Adequacy to Risk Weighted Assets 6.00% 6.00%
Tier I capital | Great Southern Bank    
Actual Capital Amount $ 609,986 $ 561,100
Actual Capital Ratio 13.10% 12.40%
Capital Required for Capital Adequacy $ 279,237 $ 270,575
Capital Required for Capital Adequacy to Risk Weighted Assets 6.00% 6.00%
Capital Required to be Well Capitalized $ 372,316 $ 360,767
Capital Required to be Well Capitalized to Risk Weighted Assets 8.00% 8.00%
Tier I leverage capital | Great Southern Bancorp, Inc.    
Actual Capital Amount $ 582,791 $ 538,060
Actual Capital Ratio 11.80% 11.70%
Capital Required for Capital Adequacy $ 198,320 $ 184,088
Capital Required for Capital Adequacy to Risk Weighted Assets 4.00% 4.00%
Tier I leverage capital | Great Southern Bank    
Actual Capital Amount $ 609,986 $ 561,100
Actual Capital Ratio 12.30% 12.20%
Capital Required for Capital Adequacy $ 198,010 $ 184,050
Capital Required for Capital Adequacy to Risk Weighted Assets 4.00% 4.00%
Capital Required to be Well Capitalized $ 247,512 $ 230,062
Capital Required to be Well Capitalized to Risk Weighted Assets 5.00% 5.00%
Common equity Tier I capital | Great Southern Bancorp, Inc.    
Actual Capital Amount $ 557,791 $ 513,060
Actual Capital Ratio 12.00% 11.40%
Capital Required for Capital Adequacy $ 209,468 $ 202,965
Capital Required for Capital Adequacy to Risk Weighted Assets 4.50% 4.50%
Common equity Tier I capital | Great Southern Bank    
Actual Capital Amount $ 609,986 $ 561,100
Actual Capital Ratio 13.10% 12.40%
Capital Required for Capital Adequacy $ 209,428 $ 202,931
Capital Required for Capital Adequacy to Risk Weighted Assets 4.50% 4.50%
Capital Required to be Well Capitalized $ 302,507 $ 293,123
Capital Required to be Well Capitalized to Risk Weighted Assets 6.50% 6.50%