Loan Receivable and Allowance for Loan and Lease Losses Non performing TDRs (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
	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012 One- to four family loans [Member]	Sep. 30, 2013 One- to four family loans [Member]	Sep. 30, 2012 One- to four family loans [Member]	Sep. 30, 2012 Commercial Real Estate [Member]	Sep. 30, 2012 Commercial Real Estate [Member]	Sep. 30, 2012 Business [Member]	Sep. 30, 2013 Business [Member]	Sep. 30, 2012 Business [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts			0	2		1					1
Financing Receivable, Modifications, Pre-Modification Recorded Investment				$ 1,403		$ 484					$ 919
Financing Receivable, Modifications, Post-Modification Recorded Investment				1,268	500	549	500				719
Financing Receivables, Modifications Number of Contracts	6	7			1		2	1	1	4		4
Financing Receivables, Modifications Pre Modification Recorded Investment	3,583	4,123			875		1,415	466	466	2,242		2,242
Loan modifications recorded investment	$ 2,708	$ 3,248			$ 0		$ 540	$ 466	$ 466	$ 2,242		$ 2,242
weighted average rate pre modification					8.13%	7.50%	6.55%	12.02%	12.02%	7.44%	6.00%	7.44%
Weighted average rate post modification					8.13%	5.50%	6.07%	12.02%	12.02%	7.44%	6.00%	7.44%