Note 4: Loans and Allowance for Loan Losses (Detail) - Recorded Investment in Impaired Loans (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Loans with a specific valuation allowance
Specific Allowance	$ 5,412	$ 2,612
Total
Recorded Balance	36,131	19,054
Unpaid Principal Balance	37,313	21,250
Specific Allowance	5,412	2,612
One to Four Family Units [Member]
Loans without a specific valuation allowance
Recorded Balance	1,539	1,424
Unpaid Principal Balance	1,539	1,424
Loans with a specific valuation allowance
Recorded Balance	85	395
Unpaid Principal Balance	111	421
Specific Allowance	73	127
Total
Recorded Balance	1,624	1,819
Unpaid Principal Balance	1,650	1,845
Specific Allowance	73	127
Real Estate Construction [Member]
Loans without a specific valuation allowance
Recorded Balance	7,137	1,181
Unpaid Principal Balance	7,137	1,181
Loans with a specific valuation allowance
Recorded Balance	540	7,334
Unpaid Principal Balance	1,060	7,854
Specific Allowance	454	1,355
Total
Recorded Balance	7,677	8,515
Unpaid Principal Balance	8,197	9,035
Specific Allowance	454	1,355
Real Estate Commercial [Member]
Loans without a specific valuation allowance
Recorded Balance	4,940	4,646
Unpaid Principal Balance	5,265	5,985
Loans with a specific valuation allowance
Recorded Balance	10,893	373
Unpaid Principal Balance	10,893	373
Specific Allowance	2,247	659
Total
Recorded Balance	15,833	5,019
Unpaid Principal Balance	16,158	6,358
Specific Allowance	2,247	659
Commercial Loans [Member]
Loans without a specific valuation allowance
Recorded Balance	3,383	1,148
Unpaid Principal Balance	3,694	1,459
Loans with a specific valuation allowance
Recorded Balance	7,204	1,900
Unpaid Principal Balance	7,204	1,900
Specific Allowance	2,595	399
Total
Recorded Balance	10,587	3,048
Unpaid Principal Balance	10,898	3,359
Specific Allowance	2,595	399
Consumer and Other Loans [Member]
Loans without a specific valuation allowance
Recorded Balance	159	376
Unpaid Principal Balance	159	376
Loans with a specific valuation allowance
Recorded Balance	251	277
Unpaid Principal Balance	251	277
Specific Allowance	43	72
Total
Recorded Balance	410	653
Unpaid Principal Balance	410	653
Specific Allowance	$ 43	$ 72