Note 4: Loans and Allowance for Loan Losses (Detail) - Recorded Investment in Impaired Loans (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Loans with a specific valuation allowance
Specific Allowance	$ 1,267	$ 2,612
Total
Recorded Balance	20,149	19,054
Unpaid Principal Balance	26,848	21,250
Specific Allowance	1,267	2,612
One to Four Family Units [Member]
Loans without a specific valuation allowance
Recorded Balance	2,596	1,424
Unpaid Principal Balance	2,596	1,424
Loans with a specific valuation allowance
Recorded Balance	148	395
Unpaid Principal Balance	174	421
Specific Allowance	97	127
Total
Recorded Balance	2,744	1,819
Unpaid Principal Balance	2,770	1,845
Specific Allowance	97	127
Real Estate Construction [Member]
Loans without a specific valuation allowance
Recorded Balance	4,972	1,181
Unpaid Principal Balance	5,492	1,181
Loans with a specific valuation allowance
Recorded Balance	770	7,334
Unpaid Principal Balance	770	7,854
Specific Allowance	454	1,355
Total
Recorded Balance	5,742	8,515
Unpaid Principal Balance	6,262	9,035
Specific Allowance	454	1,355
Real Estate Commercial [Member]
Loans without a specific valuation allowance
Recorded Balance	2,697	4,646
Unpaid Principal Balance	3,022	5,985
Loans with a specific valuation allowance
Recorded Balance	4,763	373
Unpaid Principal Balance	4,763	373
Specific Allowance	313	659
Total
Recorded Balance	7,460	5,019
Unpaid Principal Balance	7,785	6,358
Specific Allowance	313	659
Commercial Loans [Member]
Loans without a specific valuation allowance
Recorded Balance	1,002	1,148
Unpaid Principal Balance	6,830	1,459
Loans with a specific valuation allowance
Recorded Balance	2,724	1,900
Unpaid Principal Balance	2,724	1,900
Specific Allowance	355	399
Total
Recorded Balance	3,726	3,048
Unpaid Principal Balance	9,554	3,359
Specific Allowance	355	399
Consumer and Other Loans [Member]
Loans without a specific valuation allowance
Recorded Balance	147	376
Unpaid Principal Balance	147	376
Loans with a specific valuation allowance
Recorded Balance	330	277
Unpaid Principal Balance	330	277
Specific Allowance	48	72
Total
Recorded Balance	477	653
Unpaid Principal Balance	477	653
Specific Allowance	$ 48	$ 72