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Regulatory Matters - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Great Southern Bancorp, Inc.    
Total capital    
Actual capital, Amount $ 809,221 $ 770,885
Actual capital, Ratio 0.154 0.152
For Capital Adequacy Purposes, Amount $ 419,108 $ 406,994
For Capital Adequacy Purposes, Ratio 0.08 0.08
Tier I capital    
Actual capital, Amount $ 668,639 $ 632,279
Actual capital, Ratio 0.128 0.124
For Capital Adequacy Purposes, Amount $ 314,331 $ 305,246
For Capital Adequacy Purposes, Ratio 0.06 0.06
Tier I leverage capital    
Actual capital, Amount $ 668,639 $ 632,279
Actual capital, Ratio 0.112 0.11
For Capital Adequacy Purposes, Amount $ 239,536 $ 229,992
For Capital Adequacy Purposes, Ratio 0.04 0.04
Common equity Tier I capital    
Actual capital, Amount $ 643,639 $ 607,279
Actual capital, Ratio 0.123 0.119
For Capital Adequacy Purposes, Amount $ 235,748 $ 228,934
For Capital Adequacy Purposes, Ratio 0.045 0.045
Great Southern Bank    
Total capital    
Actual capital, Amount $ 725,974 $ 728,113
Actual capital, Ratio 0.139 0.143
For Capital Adequacy Purposes, Amount $ 418,985 $ 406,744
For Capital Adequacy Purposes, Ratio 0.08 0.08
To Be Well capitalized Under Prompt Corrective Action Provisions, Amount $ 523,732 $ 508,430
To Be Well capitalized Under Prompt Corrective Action Provisions, Ratio 0.10 0.10
Tier I capital    
Actual capital, Amount $ 660,411 $ 664,545
Actual capital, Ratio 0.126 0.131
For Capital Adequacy Purposes, Amount $ 314,239 $ 305,058
For Capital Adequacy Purposes, Ratio 0.06 0.06
To Be Well capitalized Under Prompt Corrective Action Provisions, Amount $ 418,985 $ 406,744
To Be Well capitalized Under Prompt Corrective Action Provisions, Ratio 0.08 0.08
Tier I leverage capital    
Actual capital, Amount $ 660,411 $ 664,545
Actual capital, Ratio 0.11 0.116
For Capital Adequacy Purposes, Amount $ 239,487 $ 229,692
For Capital Adequacy Purposes, Ratio 0.04 0.04
To Be Well capitalized Under Prompt Corrective Action Provisions, Amount $ 299,359 $ 287,115
To Be Well capitalized Under Prompt Corrective Action Provisions, Ratio 0.05 0.05
Common equity Tier I capital    
Actual capital, Amount $ 660,411 $ 664,545
Actual capital, Ratio 0.126 0.131
For Capital Adequacy Purposes, Amount $ 235,679 $ 228,794
For Capital Adequacy Purposes, Ratio 0.045 0.045
To Be Well capitalized Under Prompt Corrective Action Provisions, Amount $ 340,426 $ 330,480
To Be Well capitalized Under Prompt Corrective Action Provisions, Ratio 0.065 0.065