Note 5. Allowances For Loan And Real Estate Losses (Detail) - Allowance for Loan Losses by Portfolio Segment (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
ALLL:
Balance, beginning of period	$ 18,340		$ 20,818	$ 31,084	$ 31,084
Provision charged to expense	6	631	22	791	859
Losses charged off	(1,209)		(4,473)		(11,977)
Recoveries	127		897		852
Balance, end of period	17,264		17,264		20,818
Ending allowance balance: individually evaluated for impairment	1,548		1,548		3,293
Ending allowance balance: collectively evaluated for impairment	15,716		15,716		17,525
Loan balances:
Ending balance	350,016		350,016		353,508
Ending loan balance: individually evaluated for impairment	21,935		21,935		39,161
Ending loan balance: collectively evaluated for impairment	328,081		328,081		314,347
One-to-Four-Family Residential [Member]
ALLL:
Balance, beginning of period	5,873		6,306	5,440	5,440
Provision charged to expense	771		661		3,993
Losses charged off	(606)		(941)		(3,177)
Recoveries	8		20		50
Balance, end of period	6,046		6,046		6,306
Ending allowance balance: individually evaluated for impairment	204		204		305
Ending allowance balance: collectively evaluated for impairment	5,842		5,842		6,001
Loan balances:
Ending balance	161,081		161,081		183,158
Ending loan balance: individually evaluated for impairment	4,142		4,142		13,085
Ending loan balance: collectively evaluated for impairment	156,939		156,939		170,073
Home Equity and Second Mortgage [Member]
ALLL:
Balance, beginning of period	574		693	1,275	1,275
Provision charged to expense	(15)		(39)		(160)
Losses charged off	(11)		(112)		(486)
Recoveries	39		45		64
Balance, end of period	587		587		693
Ending allowance balance: individually evaluated for impairment	137		137		81
Ending allowance balance: collectively evaluated for impairment	450		450		612
Loan balances:
Ending balance	9,922		9,922		12,502
Ending loan balance: individually evaluated for impairment	269		269		831
Ending loan balance: collectively evaluated for impairment	9,653		9,653		11,671
Multifamily Residential [Member]
ALLL:
Balance, beginning of period	1,398		2,654	6,581	6,581
Provision charged to expense	(512)		(788)		(1,132)
Losses charged off			(997)		(2,795)
Recoveries			17
Balance, end of period	886		886		2,654
Ending allowance balance: individually evaluated for impairment					703
Ending allowance balance: collectively evaluated for impairment	886		886		1,951
Loan balances:
Ending balance	13,254		13,254		20,476
Ending loan balance: individually evaluated for impairment	279		279		8,133
Ending loan balance: collectively evaluated for impairment	12,975		12,975		12,343
Commercial Real Estate Loans [Member]
ALLL:
Balance, beginning of period	6,230		7,316	9,491	9,491
Provision charged to expense	1,939		2,589		189
Losses charged off	(505)		(2,241)		(2,375)
Recoveries	24		24		11
Balance, end of period	7,688		7,688		7,316
Ending allowance balance: individually evaluated for impairment	884		884		1,879
Ending allowance balance: collectively evaluated for impairment	6,804		6,804		5,437
Loan balances:
Ending balance	116,706		116,706		95,920
Ending loan balance: individually evaluated for impairment	9,143		9,143		13,238
Ending loan balance: collectively evaluated for impairment	107,563		107,563		82,682
One-to-Four-Family Construction [Member]
ALLL:
Balance, beginning of period	69		84	81	81
Provision charged to expense	28		13		31
Losses charged off					(28)
Balance, end of period	97		97		84
Ending allowance balance: collectively evaluated for impairment	97		97		84
Loan balances:
Ending balance	2,631		2,631		2,391
Ending loan balance: collectively evaluated for impairment	2,631		2,631		2,391
Other Construction and Land [Member]
ALLL:
Balance, beginning of period	3,547		2,567	4,035	4,035
Provision charged to expense	(2,034)		(1,760)		204
Losses charged off	(37)		(37)		(2,190)
Recoveries	11		717		68
Balance, end of period	1,487		1,487		2,567
Ending allowance balance: individually evaluated for impairment	323		323		280
Ending allowance balance: collectively evaluated for impairment	1,164		1,164		2,287
Loan balances:
Ending balance	22,253		22,253		23,443
Ending loan balance: individually evaluated for impairment	7,698		7,698		3,683
Ending loan balance: collectively evaluated for impairment	14,555		14,555		19,760
Commercial Loans [Member]
ALLL:
Balance, beginning of period	491		972	3,543	3,543
Provision charged to expense	(201)		(688)		(2,139)
Losses charged off					(517)
Recoveries	23		29		85
Balance, end of period	313		313		972
Ending allowance balance: collectively evaluated for impairment	313		313		972
Loan balances:
Ending balance	17,531		17,531		7,603
Ending loan balance: individually evaluated for impairment	402		402		72
Ending loan balance: collectively evaluated for impairment	17,129		17,129		7,531
Consumer Loans [Member]
ALLL:
Balance, beginning of period	158		226	638	638
Provision charged to expense	30		34		(127)
Losses charged off	(50)		(145)		(409)
Recoveries	22		45		124
Balance, end of period	160		160		226
Ending allowance balance: individually evaluated for impairment					45
Ending allowance balance: collectively evaluated for impairment	160		160		181
Loan balances:
Ending balance	6,638		6,638		8,015
Ending loan balance: individually evaluated for impairment	2		2		119
Ending loan balance: collectively evaluated for impairment	$ 6,636		$ 6,636		$ 7,896