Allowance for Loan Losses: Schedule of reconciliation of the allowance for loan losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Loans and Leases Receivable, Allowance, Beginning Balance	$ 20,972	$ 16,059	$ 19,921	$ 14,968
Allowance for Loan and Lease Losses, Provision for Loss, Gross	500	2,200	4,500	3,750
Allowance for Loan and Lease Losses, Charge-offs	(1,414)	(3,596)	(4,461)	(4,064)
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	82	9	180	18
Loans and Leases Receivable, Allowance, Ending Balance	20,140	14,672	20,140	14,672
Commercial business
Loans and Leases Receivable, Allowance, Beginning Balance	2,576	1,841	2,688	1,822
Allowance for Loan and Lease Losses, Provision for Loss, Gross	20	190	500	654
Allowance for Loan and Lease Losses, Charge-offs	(367)	(357)	(991)	(810)
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	54	1	86	9
Loans and Leases Receivable, Allowance, Ending Balance	2,283	1,675	2,283	1,675
Commercial Real Estate
Loans and Leases Receivable, Allowance, Beginning Balance	7,622	4,572	5,599	4,744
Allowance for Loan and Lease Losses, Provision for Loss, Gross	(99)	(33)	2,859	(205)
Allowance for Loan and Lease Losses, Charge-offs	(147)	(107)	(1,082)	(107)
Loans and Leases Receivable, Allowance, Ending Balance	7,376	4,432	7,376	4,432
Land
Loans and Leases Receivable, Allowance, Beginning Balance	3,958	3,807	4,906	2,003
Allowance for Loan and Lease Losses, Provision for Loss, Gross	(103)	558	(208)	2,362
Allowance for Loan and Lease Losses, Charge-offs	(180)	(1,879)	(1,054)	(1,879)
Allowance for Loan and Lease Losses, Recoveries of Bad Debts			31
Loans and Leases Receivable, Allowance, Ending Balance	3,675	2,486	3,675	2,486
Multi-Family
Loans and Leases Receivable, Allowance, Beginning Balance	945	2,163	1,121	2,172
Allowance for Loan and Lease Losses, Provision for Loss, Gross	4	480	212	471
Allowance for Loan and Lease Losses, Charge-offs		(858)	(384)	(858)
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	1		1
Loans and Leases Receivable, Allowance, Ending Balance	950	1,785	950	1,785
Real estate construction
Loans and Leases Receivable, Allowance, Beginning Balance	480	799	412	820
Allowance for Loan and Lease Losses, Provision for Loss, Gross	64	261	206	240
Allowance for Loan and Lease Losses, Charge-offs	(41)		(116)
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	3		4
Loans and Leases Receivable, Allowance, Ending Balance	506	1,060	506	1,060
Total consumer
Loans and Leases Receivable, Allowance, Beginning Balance	3,353	1,547	3,274	1,339
Allowance for Loan and Lease Losses, Provision for Loss, Gross	617	417	817	639
Allowance for Loan and Lease Losses, Charge-offs	(679)	(395)	(834)	(410)
Allowance for Loan and Lease Losses, Recoveries of Bad Debts	24	8	58	9
Loans and Leases Receivable, Allowance, Ending Balance	3,315	1,577	3,315	1,577
Unallocated
Loans and Leases Receivable, Allowance, Beginning Balance	2,038	1,330	1,921	2,068
Allowance for Loan and Lease Losses, Provision for Loss, Gross	(3)	327	114	(411)
Loans and Leases Receivable, Allowance, Ending Balance	$ 2,035	$ 1,657	$ 2,035	$ 1,657