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Regulatory Matters - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Great Southern Bancorp, Inc.    
Total capital    
Actual capital, Amount $ 770,885 $ 746,287
Actual capital, Ratio 0.152 0.135
For Capital Adequacy Purposes, Amount $ 406,994 $ 440,767
For Capital Adequacy Purposes, Ratio 0.080 0.080
Tier I capital    
Actual capital, Amount $ 632,279 $ 607,807
Actual capital, Ratio 0.124 0.110
For Capital Adequacy Purposes, Amount $ 305,246 $ 330,575
For Capital Adequacy Purposes, Ratio 0.060 0.060
Tier I leverage capital    
Actual capital, Amount $ 632,279 $ 607,807
Actual capital, Ratio 0.110 0.106
For Capital Adequacy Purposes, Amount $ 229,992 $ 228,673
For Capital Adequacy Purposes, Ratio 0.040 0.040
Common equity Tier I capital    
Actual capital, Amount $ 607,279 $ 582,807
Actual capital, Ratio 0.119 0.106
For Capital Adequacy Purposes, Amount $ 228,934 $ 247,932
For Capital Adequacy Purposes, Ratio 0.045 0.045
Great Southern Bank    
Total capital    
Actual capital, Amount $ 728,113 $ 721,616
Actual capital, Ratio 0.143 0.131
For Capital Adequacy Purposes, Amount $ 406,744 $ 440,683
For Capital Adequacy Purposes, Ratio 0.080 0.080
To Be Well capitalized Under Prompt Corrective Action Provisions, Amount $ 508,430 $ 550,854
To Be Well capitalized Under Prompt Corrective Action Provisions, Ratio 0.100 0.100
Tier I capital    
Actual capital, Amount $ 664,545 $ 658,136
Actual capital, Ratio 0.131 0.119
For Capital Adequacy Purposes, Amount $ 305,058 $ 330,512
For Capital Adequacy Purposes, Ratio 0.060 0.060
To Be Well capitalized Under Prompt Corrective Action Provisions, Amount $ 406,744 $ 440,683
To Be Well capitalized Under Prompt Corrective Action Provisions, Ratio 0.080 0.080
Tier I leverage capital    
Actual capital, Amount $ 664,545 $ 658,136
Actual capital, Ratio 0.116 0.115
For Capital Adequacy Purposes, Amount $ 229,692 $ 228,511
For Capital Adequacy Purposes, Ratio 0.040 0.040
To Be Well capitalized Under Prompt Corrective Action Provisions, Amount $ 287,115 $ 285,638
To Be Well capitalized Under Prompt Corrective Action Provisions, Ratio 0.050 0.050
Common equity Tier I capital    
Actual capital, Amount $ 664,545 $ 658,136
Actual capital, Ratio 0.131 0.119
For Capital Adequacy Purposes, Amount $ 228,794 $ 247,884
For Capital Adequacy Purposes, Ratio 0.045 0.045
To Be Well capitalized Under Prompt Corrective Action Provisions, Amount $ 330,480 $ 358,055
To Be Well capitalized Under Prompt Corrective Action Provisions, Ratio 0.065 0.065