Note 4. Loans Receivable (Detail) - Nonaccrual loans (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Past Due 30-89 Days [Member] | One-to-Four-Family Residential [Member] | Nonaccrual [Member]
Past due loans	$ 432	$ 1,870
Past Due 30-89 Days [Member] | Home Equity and Second Mortgage [Member] | Nonaccrual [Member]
Past due loans	41	57
Past Due 30-89 Days [Member] | Commercial Real Estate Loans [Member] | Nonaccrual [Member]
Past due loans	1,389	203
Past Due 30-89 Days [Member] | Other Construction and Land [Member] | Nonaccrual [Member]
Past due loans	421	164
Past Due 30-89 Days [Member] | Commercial Loans [Member] | Nonaccrual [Member]
Past due loans	3
Past Due 30-89 Days [Member] | Nonaccrual [Member]
Past due loans		2,294
Past Due 30-89 Days [Member] | Nonaccrual [Member]
Past due loans	2,286
Ninety Days or More Past Due [Member] | One-to-Four-Family Residential [Member] | Nonaccrual [Member]
Past due loans	4,866	5,604
Ninety Days or More Past Due [Member] | Home Equity and Second Mortgage [Member] | Nonaccrual [Member]
Past due loans	323	437
Ninety Days or More Past Due [Member] | Commercial Real Estate Loans [Member] | Nonaccrual [Member]
Past due loans	2,118	4,752
Ninety Days or More Past Due [Member] | Other Construction and Land [Member] | Nonaccrual [Member]
Past due loans	3,910	1,344
Ninety Days or More Past Due [Member] | Commercial Loans [Member] | Nonaccrual [Member]
Past due loans	380
Ninety Days or More Past Due [Member] | Consumer Loans [Member] | Nonaccrual [Member]
Past due loans	81	5
Ninety Days or More Past Due [Member] | Nonaccrual [Member]
Past due loans		12,142
Ninety Days or More Past Due [Member] | Nonaccrual [Member]
Past due loans	11,678
One-to-Four-Family Residential [Member] | Nonaccrual [Member]
Current	1,741	4,262
Total	7,039	11,736
Home Equity and Second Mortgage [Member] | Nonaccrual [Member]
Current	224	270
Total	588	764
Multifamily Residential [Member] | Nonaccrual [Member]
Current	279	4,645
Total	279	4,645
Commercial Real Estate Loans [Member] | Nonaccrual [Member]
Current	4,920	8,283
Total	8,427	13,238
Other Construction and Land [Member] | Nonaccrual [Member]
Current	794	1,893
Total	5,125	3,401
Commercial Loans [Member] | Nonaccrual [Member]
Current	19	72
Total	402	72
Consumer Loans [Member] | Nonaccrual [Member]
Current	2	93
Total	83	98
Nonaccrual [Member]
Current		19,518
Total		33,954
Nonaccrual [Member]
Current	7,979
Total	$ 21,943