Note 11: Fair Value Measurements: Schedule of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020
Letter of Credit
Financial Instruments Owned Carrying Amount	$ 0	$ 0
Line of Credit
Financial Instruments Owned Carrying Amount	0	0
Financial liabilities | Subordinated Debt
Financial Instruments Owned Carrying Amount	15,168	15,142
Financial liabilities | Federal Home Loan Bank Advances
Financial Instruments Owned Carrying Amount	85,637	70,024
Financial assets | Loans Receivable
Financial Instruments Owned Carrying Amount	2,150,463	2,141,929
Financial assets | Cash and Cash Equivalents
Financial Instruments Owned Carrying Amount	41,875	54,245
Financial assets | Interest-bearing time deposits
Financial Instruments Owned Carrying Amount	975	974
Financial assets | Investment in Federal Home Loan Bank Stock
Financial Instruments Owned Carrying Amount	6,939	6,390
Financial assets | Investment in Stock of Federal Reserve Bank of St. Louis
Financial Instruments Owned Carrying Amount	5,017	4,363
Financial assets | Accrued interest receivable
Financial Instruments Owned Carrying Amount	13,766	12,116
Deposits | Financial liabilities
Financial Instruments Owned Carrying Amount	2,168,074	2,184,847
Accrued interest payable | Financial liabilities
Financial Instruments Owned Carrying Amount	1,402	1,646
Commitments to Extend Credit
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 1 | Letter of Credit
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 1 | Line of Credit
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 1 | Financial liabilities | Subordinated Debt
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 1 | Financial liabilities | Federal Home Loan Bank Advances
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 1 | Financial assets | Loans Receivable
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 1 | Financial assets | Cash and Cash Equivalents
Financial Instruments Owned Carrying Amount	41,875	54,245
Fair Value, Inputs, Level 1 | Financial assets | Interest-bearing time deposits
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 1 | Financial assets | Investment in Federal Home Loan Bank Stock
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 1 | Financial assets | Investment in Stock of Federal Reserve Bank of St. Louis
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 1 | Financial assets | Accrued interest receivable
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 1 | Deposits | Financial liabilities
Financial Instruments Owned Carrying Amount	1,520,675	1,508,740
Fair Value, Inputs, Level 1 | Accrued interest payable | Financial liabilities
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 1 | Commitments to Extend Credit
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 2 | Letter of Credit
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 2 | Line of Credit
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 2 | Financial liabilities | Subordinated Debt
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 2 | Financial liabilities | Federal Home Loan Bank Advances
Financial Instruments Owned Carrying Amount	87,514	72,136
Fair Value, Inputs, Level 2 | Financial assets | Loans Receivable
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 2 | Financial assets | Cash and Cash Equivalents
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 2 | Financial assets | Interest-bearing time deposits
Financial Instruments Owned Carrying Amount	975	974
Fair Value, Inputs, Level 2 | Financial assets | Investment in Federal Home Loan Bank Stock
Financial Instruments Owned Carrying Amount	6,939	6,390
Fair Value, Inputs, Level 2 | Financial assets | Investment in Stock of Federal Reserve Bank of St. Louis
Financial Instruments Owned Carrying Amount	5,017	4,363
Fair Value, Inputs, Level 2 | Financial assets | Accrued interest receivable
Financial Instruments Owned Carrying Amount	13,766	12,116
Fair Value, Inputs, Level 2 | Deposits | Financial liabilities
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 2 | Accrued interest payable | Financial liabilities
Financial Instruments Owned Carrying Amount	1,402	1,646
Fair Value, Inputs, Level 2 | Commitments to Extend Credit
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 3 | Letter of Credit
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 3 | Line of Credit
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 3 | Financial liabilities | Subordinated Debt
Financial Instruments Owned Carrying Amount	13,455	11,511
Fair Value, Inputs, Level 3 | Financial liabilities | Federal Home Loan Bank Advances
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 3 | Financial assets | Loans Receivable
Financial Instruments Owned Carrying Amount	2,167,748	2,143,823
Fair Value, Inputs, Level 3 | Financial assets | Cash and Cash Equivalents
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 3 | Financial assets | Interest-bearing time deposits
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 3 | Financial assets | Investment in Federal Home Loan Bank Stock
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 3 | Financial assets | Investment in Stock of Federal Reserve Bank of St. Louis
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 3 | Financial assets | Accrued interest receivable
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 3 | Deposits | Financial liabilities
Financial Instruments Owned Carrying Amount	651,528	676,816
Fair Value, Inputs, Level 3 | Accrued interest payable | Financial liabilities
Financial Instruments Owned Carrying Amount	0	0
Fair Value, Inputs, Level 3 | Commitments to Extend Credit
Financial Instruments Owned Carrying Amount	$ 0	$ 0