Note 15: Disclosures About Fair Value of Financial Instruments (Details) (Fair Value Financial Instruments, USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financial Assets | Cash and Cash Equivalents
Financial Instruments Owned Carrying Amount	$ 218,647	$ 227,925
Financial Instruments, Owned, at Fair Value	218,647	227,925
Financial Instruments Owned Hierarchy Level	1	1
Financial Assets | Held-to-maturity Securities
Financial Instruments Owned Carrying Amount	450	805
Financial Instruments, Owned, at Fair Value	499	912
Financial Instruments Owned Hierarchy Level	2	2
Financial Assets | Mortgage Loans Held For Sale
Financial Instruments Owned Carrying Amount	14,579	7,239
Financial Instruments, Owned, at Fair Value	14,579	7,239
Financial Instruments Owned Hierarchy Level	2	2
Financial Assets | Loans Receivable
Financial Instruments Owned Carrying Amount	3,038,848	2,439,530
Financial Instruments, Owned, at Fair Value	3,047,741	2,442,917
Financial Instruments Owned Hierarchy Level	3	3
Financial Assets | Accrued Interest Receivable
Financial Instruments Owned Carrying Amount	11,219	11,408
Financial Instruments, Owned, at Fair Value	11,219	11,408
Financial Instruments Owned Hierarchy Level	3	3
Financial Assets | Investment in Federal Home Loan Bank Stock
Financial Instruments Owned Carrying Amount	16,893	9,822
Financial Instruments, Owned, at Fair Value	16,893	9,822
Financial Instruments Owned Hierarchy Level	3	3
Financial Liabilities | Repurchase Agreements
Financial Instruments Owned Carrying Amount		50,000
Financial Instruments, Owned, at Fair Value		53,485
Financial Instruments Owned Hierarchy Level	3	3
Financial Liabilities | Deposits
Financial Instruments Owned Carrying Amount	2,990,840	2,808,626
Financial Instruments, Owned, at Fair Value	2,996,226	2,813,779
Financial Instruments Owned Hierarchy Level	3	3
Financial Liabilities | Federal Home Loan Bank Advances
Financial Instruments Owned Carrying Amount	271,641	126,757
Financial Instruments, Owned, at Fair Value	273,568	131,281
Financial Instruments Owned Hierarchy Level	3	3
Financial Liabilities | Short-term Debt
Financial Instruments Owned Carrying Amount	211,444	136,109
Financial Instruments, Owned, at Fair Value	211,444	136,109
Financial Instruments Owned Hierarchy Level	3	3
Financial Liabilities | Subordinated Debt
Financial Instruments Owned Carrying Amount	30,929	30,929
Financial Instruments, Owned, at Fair Value	30,929	30,929
Financial Instruments Owned Hierarchy Level	3	3
Financial Liabilities | Accrued Interest Payable
Financial Instruments Owned Carrying Amount	1,067	1,099
Financial Instruments, Owned, at Fair Value	1,067	1,099
Financial Instruments Owned Hierarchy Level	3	3
Financial Liabilities | Loan Origination Commitments
Financial Instruments Owned Hierarchy Level	3	3
Financial Liabilities | Letter of Credit
Financial Instruments Owned Carrying Amount	92	76
Financial Instruments, Owned, at Fair Value	$ 92	$ 76
Financial Instruments Owned Hierarchy Level	3	3
Financial Liabilities | Line of Credit
Financial Instruments Owned Hierarchy Level	3	3