Note 15: Disclosures About Fair Value of Financial Instruments: Schedule Of Financial Instruments Fair Value (Details) $ in Thousands	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Financial Assets | Cash and Cash Equivalents
Financial Instruments Owned Carrying Amount	$ 242,253	$ 279,769
Financial Instruments, Owned, at Fair Value	$ 242,253	$ 279,769
Hierarchy Level	1	1
Financial Assets | Held-to-maturity Securities
Financial Instruments Owned Carrying Amount	$ 130	$ 247
Financial Instruments, Owned, at Fair Value	$ 131	$ 258
Hierarchy Level	2	2
Financial Assets | Mortgage Loans Held For Sale
Financial Instruments Owned Carrying Amount	$ 8,203	$ 16,445
Financial Instruments, Owned, at Fair Value	$ 8,203	$ 16,445
Hierarchy Level	2	2
Financial Assets | Loans Receivable
Financial Instruments Owned Carrying Amount	$ 3,726,302	$ 3,759,966
Financial Instruments, Owned, at Fair Value	$ 3,735,216	$ 3,766,709
Hierarchy Level	3	3
Financial Assets | Accrued Interest Receivable
Financial Instruments Owned Carrying Amount	$ 12,338	$ 11,875
Financial Instruments, Owned, at Fair Value	$ 12,338	$ 11,875
Hierarchy Level	3	3
Financial Assets | Investment in Federal Home Loan Bank Stock
Financial Instruments Owned Carrying Amount	$ 11,182	$ 13,034
Financial Instruments, Owned, at Fair Value	$ 11,182	$ 13,034
Hierarchy Level	3	3
Financial Liabilities | Subordinated Debentures
Financial Instruments Owned Carrying Amount	$ 25,774	$ 25,774
Financial Instruments, Owned, at Fair Value	$ 25,774	$ 25,774
Hierarchy Level	3	3
Financial Liabilities | Deposits
Financial Instruments Owned Carrying Amount	$ 3,597,144	$ 3,677,230
Financial Instruments, Owned, at Fair Value	$ 3,606,400	$ 3,683,751
Hierarchy Level	3	3
Financial Liabilities | Federal Home Loan Bank Advances
Financial Instruments Owned Carrying Amount	$ 127,500	$ 31,452
Financial Instruments, Owned, at Fair Value	$ 127,500	$ 32,379
Hierarchy Level	3	3
Financial Liabilities | Short-term Debt
Financial Instruments Owned Carrying Amount	$ 97,135	$ 286,023
Financial Instruments, Owned, at Fair Value	$ 97,135	$ 286,023
Hierarchy Level	3	3
Financial Liabilities | Subordinated Debt
Financial Instruments Owned Carrying Amount	$ 73,688	$ 73,537
Financial Instruments, Owned, at Fair Value	$ 76,500	$ 76,031
Hierarchy Level	2	2
Financial Liabilities | Accrued Interest Payable
Financial Instruments Owned Carrying Amount	$ 2,904	$ 2,723
Financial Instruments, Owned, at Fair Value	$ 2,904	$ 2,723
Hierarchy Level	3	3
Unrecognized Financial Instruments Net Of Contractual Value | Loan Origination Commitments
Financial Instruments Owned Carrying Amount	$ 0	$ 0
Financial Instruments, Owned, at Fair Value	$ 0	$ 0
Hierarchy Level	3	3
Unrecognized Financial Instruments Net Of Contractual Value | Letter of Credit
Financial Instruments Owned Carrying Amount	$ 85	$ 92
Financial Instruments, Owned, at Fair Value	$ 85	$ 92
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
Hierarchy Level	3	3