Note 15: Disclosures About Fair Value of Financial Instruments: Schedule Of Financial Instruments Fair Value (Details) $ in Thousands	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Letter of Credit
Financial Instruments Owned Carrying Amount	$ 146	$ 85
Financial Instruments, Owned, at Fair Value	$ 146	$ 85
Fair Value Hierarchy Level	3	3
Line of Credit
Financial Instruments Owned Carrying Amount	$ 0	$ 0
Financial Instruments, Owned, at Fair Value	$ 0	$ 0
Fair Value Hierarchy Level	3	3
Commitments to Extend Credit
Financial Instruments Owned Carrying Amount	$ 0	$ 0
Financial Instruments, Owned, at Fair Value	$ 0	$ 0
Fair Value Hierarchy Level	3	3
Financial assets | Mortgage loans held for sale
Financial Instruments Owned Carrying Amount	$ 1,650	$ 8,203
Financial Instruments, Owned, at Fair Value	$ 1,650	$ 8,203
Fair Value Hierarchy Level	2	2
Financial assets | Accrued interest receivable
Financial Instruments Owned Carrying Amount	$ 13,448	$ 12,338
Financial Instruments, Owned, at Fair Value	$ 13,448	$ 12,338
Fair Value Hierarchy Level	3	3
Financial assets | Held-to-maturity Securities
Financial Instruments Owned Carrying Amount	$ 0	$ 130
Financial Instruments, Owned, at Fair Value	$ 0	$ 131
Fair Value Hierarchy Level	2	2
Financial assets | Cash and Cash Equivalents
Financial Instruments Owned Carrying Amount	$ 202,742	$ 242,253
Financial Instruments, Owned, at Fair Value	$ 202,742	$ 242,253
Fair Value Hierarchy Level	1	1
Financial assets | Loans Receivable
Financial Instruments Owned Carrying Amount	$ 3,989,001	$ 3,726,302
Financial Instruments, Owned, at Fair Value	$ 3,955,786	$ 3,735,216
Fair Value Hierarchy Level	3	3
Financial assets | Investment in Federal Home Loan Bank Stock
Financial Instruments Owned Carrying Amount	$ 12,438	$ 11,182
Financial Instruments, Owned, at Fair Value	$ 12,438	$ 11,182
Fair Value Hierarchy Level	3	3
Financial liabilities | Junior Subordinated Debt
Financial Instruments Owned Carrying Amount	$ 25,774	$ 25,774
Financial Instruments, Owned, at Fair Value	$ 25,774	$ 25,774
Fair Value Hierarchy Level	3	3
Financial liabilities | Subordinated Debt
Financial Instruments Owned Carrying Amount	$ 73,842	$ 73,688
Financial Instruments, Owned, at Fair Value	$ 75,188	$ 76,500
Fair Value Hierarchy Level	2	2
Financial liabilities | Federal Home Loan Bank Advances
Financial Instruments Owned Carrying Amount	$ 0	$ 127,500
Financial Instruments, Owned, at Fair Value	$ 0	$ 127,500
Fair Value Hierarchy Level	3	3
Financial liabilities | Deposits
Financial Instruments Owned Carrying Amount	$ 3,738,107	$ 3,597,144
Financial Instruments, Owned, at Fair Value	$ 3,730,999	$ 3,606,400
Fair Value Hierarchy Level	3	3
Financial liabilities | Short-term Debt
Financial Instruments Owned Carrying Amount	$ 297,978	$ 97,135
Financial Instruments, Owned, at Fair Value	$ 297,978	$ 97,135
Fair Value Hierarchy Level	3	3
Financial liabilities | Accrued interest payable
Financial Instruments Owned Carrying Amount	$ 3,570	$ 2,904
Financial Instruments, Owned, at Fair Value	$ 3,570	$ 2,904
Fair Value Hierarchy Level	3	3