Loans Receivable and The Allowance For Loan Losses: Schedule of Allowance for loan losses and loan balances individually and collectively evaluated for impairment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012 Beginning balance	Jun. 30, 2011 Beginning balance	Jun. 30, 2012 Beginning balance	Jun. 30, 2011 Beginning balance	Jun. 30, 2012 Provision for loan losses	Jun. 30, 2011 Provision for loan losses	Jun. 30, 2012 Provision for loan losses	Jun. 30, 2011 Provision for loan losses	Jun. 30, 2012 Recoveries	Jun. 30, 2011 Recoveries	Jun. 30, 2012 Recoveries	Jun. 30, 2011 Recoveries	Jun. 30, 2012 Charge-offs	Jun. 30, 2011 Charge-offs	Jun. 30, 2012 Charge-offs	Jun. 30, 2011 Charge-offs	Jun. 30, 2012 Ending balance	Jun. 30, 2011 Ending balance	Jun. 30, 2012 Ending balance	Jun. 30, 2011 Ending balance	Jun. 30, 2012 Allowance individually evaluated for impairment	Jun. 30, 2011 Allowance individually evaluated for impairment	Jun. 30, 2012 Allowance collectively evaluated for impairment	Jun. 30, 2011 Allowance collectively evaluated for impairment	Jun. 30, 2012 Total allowance for loan losses	Jun. 30, 2011 Total allowance for loan losses	Jun. 30, 2012 Allowance loans individually evaluated for impairment	Jun. 30, 2011 Allowance loans individually evaluated for impairment	Jun. 30, 2012 Allowance loans collectively evaluated for impairment	Jun. 30, 2011 Allowance loans collectively evaluated for impairment	Jun. 30, 2012 Allowance total loans	Jun. 30, 2011 Allowance total loans
Commercial Real Estate Loans	$ 17,083	$ 11,871	$ 16,457	$ 11,779	$ 992	$ 3,072	$ 2,327	$ 4,153	$ 18	$ 15	$ 632	$ 15	$ (1,259)	$ (1,871)	$ (2,582)	$ (2,860)	$ 16,834	$ 13,087	$ 16,834	$ 13,087	$ 400	$ 702	$ 16,434	$ 12,385	$ 16,834	$ 13,087	$ 9,468	$ 24,141	$ 1,082,118	$ 1,051,936	$ 1,091,586	$ 1,076,077
Multifamily Real Estate Loans	3,261	6,055	3,952	3,963	1,847	(407)	1,156	2,112						(244)		(671)	5,108	5,404	5,108	5,404	1,464	648	3,644	4,756	5,108	5,404	5,000	648	125,319	161,546	130,319	162,194
Construction and Land Loans	15,871	30,346	18,184	33,121	1,756	991	1,997	8,718	1,050	716	1,420	751	(1,703)	(6,077)	(4,627)	(16,614)	16,974	25,976	16,974	25,976	2,739	5,769	14,235	20,207	16,974	25,976	11,594	61,315	282,283	293,963	293,877	355,278
Commercial Business Loans	13,123	22,054	15,159	24,545	887	1,770	22	1,566	639	81	875	162	(2,297)	(3,993)	(3,704)	(6,361)	12,352	19,912	12,352	19,912	1,054	1,016	11,298	18,896	12,352	19,912	10,514	11,786	589,532	761,533	600,046	773,319
Agricultural Business Loans	1,887	1,441	1,548	1,846	(608)	134	6	(148)	15		15			(166)	(275)	(289)	1,294	1,409	1,294	1,409			1,294	1,409	1,294	1,409			211,705	1,409	211,705	1,409
One- to Four-Family Residential Loans	12,869	8,149	12,299	5,829	2,876	1,970	4,407	6,447	374	29	379	81	(1,906)	(1,894)	(2,872)	(4,103)	14,213	8,254	14,213	8,254	1,281	413	12,932	7,841	14,213	8,254	20,989	16,126	586,500	642,090	607,489	658,216
Consumer Loans	1,274	1,452	1,253	1,794	345	221	1,064	163	195	84	331	162	(449)	(312)	(1,283)	(674)	1,365	1,445	1,365	1,445	33	1,784	1,332	(339)	1,365	1,445	1,580	3,250	275,655	276,924	277,235	280,174
Commitments and Unallocated Loans	16,176	16,264	14,060	14,524	(4,095)	249	(1,979)	1,989									12,081	16,513	12,081	16,513			12,081	16,513	12,081	16,513
Total loan losses and loan balances	$ 81,544	$ 97,632	$ 82,912	$ 97,401	$ 4,000	$ 8,000	$ 9,000	$ 25,000	$ 2,291	$ 925	$ 3,652	$ 1,171	$ (7,614)	$ (14,557)	$ (15,343)	$ (31,572)	$ 80,221	$ 92,000	$ 80,221	$ 92,000	$ 6,971	$ 10,332	$ 73,250	$ 81,668	$ 80,221	$ 92,000	$ 59,145	$ 117,266	$ 3,153,112	$ 3,189,401	$ 3,212,257	$ 3,306,667