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Note 3: Loans and Allowance for Loan Losses: Troubled Debt Restructurings on Financing Receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Contractual Interest Rate Reduction | Land and Land Improvements    
Loan Restructuring, Trial Modifications, Amount $ 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 | Consumer Loan    
Loan Restructuring, Trial Modifications, Amount 0 0
Contractual Interest Rate Reduction | Modifications    
Loan Restructuring, Trial Modifications, Amount 1,348 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 | 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 | Consumer Loan    
Loan Restructuring, Trial Modifications, Amount 535 245
Extended Maturity | Modifications    
Loan Restructuring, Trial Modifications, Amount 566 261
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 | 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 | Consumer Loan    
Loan Restructuring, Trial Modifications, Amount 0 0
Combination of Interest and Term | Modifications    
Loan Restructuring, Trial Modifications, Amount 106 6,033
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 | 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 | Consumer Loan    
Loan Restructuring, Trial Modifications, Amount 535 245
Loan Restructuring Modification | Modifications    
Loan Restructuring, Trial Modifications, Amount $ 2,020 6,294
Loan Restructuring Modification | Commercial business    
Loan Restructuring, Trial Modifications, Amount   $ 290