Note 15: Disclosures About Fair Value of Financial Instruments: Schedule Of Financial Instruments Fair Value (Details) $ in Thousands	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Unrecognized financial instruments (net of contractual value) | Commitments to originate loans
Financial Instruments Owned Carrying Amount	$ 0	$ 0
Financial Instruments, Owned, at Fair Value	$ 0	$ 0
Fair Value Hierarchy Level	3	3
Unrecognized financial instruments (net of contractual value) | Letter of Credit
Financial Instruments Owned Carrying Amount	$ 48	$ 109
Financial Instruments, Owned, at Fair Value	$ 48	$ 109
Fair Value Hierarchy Level	3	3
Unrecognized financial instruments (net of contractual value) | Line of Credit
Financial Instruments Owned Carrying Amount	$ 0	$ 0
Financial Instruments, Owned, at Fair Value	$ 0	$ 0
Fair Value Hierarchy Level	3	3
Financial assets | Loans Receivable
Financial Instruments Owned Carrying Amount	$ 4,399,645	$ 4,153,982
Financial Instruments, Owned, at Fair Value	$ 4,392,396	$ 4,129,984
Fair Value Hierarchy Level	3	3
Financial assets | Cash and Cash Equivalents
Financial Instruments Owned Carrying Amount	$ 473,645	$ 220,155
Financial Instruments, Owned, at Fair Value	$ 473,645	$ 220,155
Fair Value Hierarchy Level	1	1
Financial assets | Mortgage loans held for sale
Financial Instruments Owned Carrying Amount	$ 20,188	$ 9,242
Financial Instruments, Owned, at Fair Value	$ 20,188	$ 9,242
Fair Value Hierarchy Level	2	2
Financial assets | Interest receivable
Financial Instruments Owned Carrying Amount	$ 14,759	$ 13,530
Financial Instruments, Owned, at Fair Value	$ 14,759	$ 13,530
Fair Value Hierarchy Level	3	3
Financial assets | Investment in FHLBank stock and other interest-earning assets
Financial Instruments Owned Carrying Amount	$ 11,276	$ 13,473
Financial Instruments, Owned, at Fair Value	$ 11,276	$ 13,473
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	$ 148,032	$ 74,276
Financial Instruments, Owned, at Fair Value	$ 149,625	$ 76,875
Fair Value Hierarchy Level	2	2
Financial liabilities | Deposits
Financial Instruments Owned Carrying Amount	$ 4,512,158	$ 3,960,106
Financial Instruments, Owned, at Fair Value	$ 4,524,749	$ 3,963,875
Fair Value Hierarchy Level	3	3
Financial liabilities | Short-term Debt
Financial Instruments Owned Carrying Amount	$ 192,903	$ 312,324
Financial Instruments, Owned, at Fair Value	$ 192,903	$ 312,324
Fair Value Hierarchy Level	3	3
Financial liabilities | Interest payable
Financial Instruments Owned Carrying Amount	$ 3,464	$ 4,250
Financial Instruments, Owned, at Fair Value	$ 3,464	$ 4,250
Fair Value Hierarchy Level	3	3