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Note 3: Loans and Allowance for Loan Losses: Financing Receivable, Troubled Debt Restructuring (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Contractual Interest Rate Reduction | Land and Land Improvements      
Loan Restructuring, Trial Modifications, Amount   $ 0  
Contractual Interest Rate Reduction | Consumer Loan      
Loan Restructuring, Trial Modifications, Amount $ 0 0 $ 0
Contractual Interest Rate Reduction | Modifications      
Loan Restructuring, Trial Modifications, Amount 0 1,348 0
Contractual Interest Rate Reduction | Residential one-to-four family      
Loan Restructuring, Trial Modifications, Amount   1,348  
Contractual Interest Rate Reduction | Commercial Real Estate      
Loan Restructuring, Trial Modifications, Amount   0 0
Contractual Interest Rate Reduction | Commercial business      
Loan Restructuring, Trial Modifications, Amount     0
Extended Maturity | Land and Land Improvements      
Loan Restructuring, Trial Modifications, Amount   31  
Extended Maturity | Consumer Loan      
Loan Restructuring, Trial Modifications, Amount 136 535 245
Extended Maturity | Modifications      
Loan Restructuring, Trial Modifications, Amount 136 566 261
Extended Maturity | Residential one-to-four family      
Loan Restructuring, Trial Modifications, Amount   0  
Extended Maturity | Commercial Real Estate      
Loan Restructuring, Trial Modifications, Amount   0 0
Extended Maturity | Commercial business      
Loan Restructuring, Trial Modifications, Amount     16
Combination of Interest and Term | Land and Land Improvements      
Loan Restructuring, Trial Modifications, Amount   0  
Combination of Interest and Term | Consumer Loan      
Loan Restructuring, Trial Modifications, Amount 0 0 0
Combination of Interest and Term | Modifications      
Loan Restructuring, Trial Modifications, Amount 0 106 6,033
Combination of Interest and Term | Residential one-to-four family      
Loan Restructuring, Trial Modifications, Amount   0  
Combination of Interest and Term | Commercial Real Estate      
Loan Restructuring, Trial Modifications, Amount   106 5,759
Combination of Interest and Term | Commercial business      
Loan Restructuring, Trial Modifications, Amount     274
Loan Restructuring Modification | Land and Land Improvements      
Loan Restructuring, Trial Modifications, Amount   31  
Loan Restructuring Modification | Consumer Loan      
Loan Restructuring, Trial Modifications, Amount 136 535 245
Loan Restructuring Modification | Modifications      
Loan Restructuring, Trial Modifications, Amount $ 136 2,020 6,294
Loan Restructuring Modification | Residential one-to-four family      
Loan Restructuring, Trial Modifications, Amount   1,348  
Loan Restructuring Modification | Commercial Real Estate      
Loan Restructuring, Trial Modifications, Amount   $ 106 5,759
Loan Restructuring Modification | Commercial business      
Loan Restructuring, Trial Modifications, Amount     $ 290