Note 4. Loans Receivable (Detail) - Troubled Debt Restructurings ("TDRs") (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Number of TDR loans	37	57
Balance (in Dollars)	$ 11,018	$ 13,874
Accruing Troubled Debt Restructurings [Member] | One-to-Four-Family Residential [Member]
Number of TDR loans	11	15
Balance (in Dollars)	1,114	1,349
Accruing Troubled Debt Restructurings [Member] | Home Equity and Second Mortgage [Member]
Number of TDR loans	1	3
Balance (in Dollars)	19	68
Accruing Troubled Debt Restructurings [Member] | Commercial Real Estate [Member]
Number of TDR loans	1
Balance (in Dollars)	1,265
Accruing Troubled Debt Restructurings [Member] | Other Construction and Land [Member]
Number of TDR loans	1	5
Balance (in Dollars)	3,491	282
Accruing Troubled Debt Restructurings [Member] | Consumer Loans [Member]
Number of TDR loans	4
Balance (in Dollars)	8
Accruing Troubled Debt Restructurings [Member] | Multifamily Residential [Member]
Number of TDR loans		1
Balance (in Dollars)		3,488
Accruing Troubled Debt Restructurings [Member] | Consumer [Member]
Number of TDR loans		7
Balance (in Dollars)		20
Accruing Troubled Debt Restructurings [Member]
Number of TDR loans	18	31
Balance (in Dollars)	5,897	5,207
Nonaccrual Troubled Debt Restructurings [Member] | One-to-Four-Family Residential [Member]
Number of TDR loans	7	11
Balance (in Dollars)	661	1,134
Nonaccrual Troubled Debt Restructurings [Member] | Home Equity and Second Mortgage [Member]
Number of TDR loans	3	4
Balance (in Dollars)	75	133
Nonaccrual Troubled Debt Restructurings [Member] | Commercial Real Estate [Member]
Number of TDR loans	3	6
Balance (in Dollars)	2,757	4,759
Nonaccrual Troubled Debt Restructurings [Member] | Other Construction and Land [Member]
Number of TDR loans	6	4
Balance (in Dollars)	1,628	1,242
Nonaccrual Troubled Debt Restructurings [Member] | Multifamily Residential [Member]
Number of TDR loans		1
Balance (in Dollars)		1,399
Nonaccrual Troubled Debt Restructurings [Member]
Number of TDR loans	19	26
Balance (in Dollars)	5,121	8,667
One-to-Four-Family Residential [Member]
Number of TDR loans	18	26
Balance (in Dollars)	1,775	2,483
Home Equity and Second Mortgage [Member]
Number of TDR loans	4	7
Balance (in Dollars)	94	201
Commercial Real Estate [Member]
Number of TDR loans	4	6
Balance (in Dollars)	4,022	4,759
Other Construction and Land [Member]
Number of TDR loans	7	9
Balance (in Dollars)	5,119	1,524
Consumer Loans [Member]
Number of TDR loans	4
Balance (in Dollars)	8
Multifamily Residential [Member]
Number of TDR loans		2
Balance (in Dollars)		4,887
Consumer [Member]
Number of TDR loans		7
Balance (in Dollars)		$ 20