Loans (Details 7) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2012 Loans	Jun. 30, 2012 Loans	Jun. 30, 2012 Loans
Loans by class modified as troubled debt restructurings
Number of loans	27	74	28
Pre-Modification outstanding recorded investment	$ 1,300	$ 7,251
Post-Modification recorded investment	1,263	7,154
Recorded Investment			4,852
Permanent Real Estate Loans [Member]
Loans by class modified as troubled debt restructurings
Number of loans	7	28	19
Pre-Modification outstanding recorded investment	350	4,169
Post-Modification recorded investment	345	4,126
Recorded Investment			4,284
Permanent Real Estate Loans [Member] | One-to four-family residential [Member]
Loans by class modified as troubled debt restructurings
Number of loans	7	21	14
Pre-Modification outstanding recorded investment	350	2,306
Post-Modification recorded investment	345	2,264
Recorded Investment			1,570
Permanent Real Estate Loans [Member] | Multifamily residential [Member]
Loans by class modified as troubled debt restructurings
Number of loans		6
Pre-Modification outstanding recorded investment		1,439
Post-Modification recorded investment		1,438
Recorded Investment
Permanent Real Estate Loans [Member] | Nonresidential [Member]
Loans by class modified as troubled debt restructurings
Number of loans		1	3
Pre-Modification outstanding recorded investment		424
Post-Modification recorded investment		424
Recorded Investment			1,219
Permanent Real Estate Loans [Member] | Land [Member]
Loans by class modified as troubled debt restructurings
Number of loans			2
Pre-Modification outstanding recorded investment
Post-Modification recorded investment
Recorded Investment			1,495
Construction Loans [Member]
Loans by class modified as troubled debt restructurings
Number of loans		3	4
Pre-Modification outstanding recorded investment		853
Post-Modification recorded investment		830
Recorded Investment			371
Construction Loans [Member] | One-to four-family residential [Member]
Loans by class modified as troubled debt restructurings
Number of loans		3	4
Pre-Modification outstanding recorded investment		853
Post-Modification recorded investment		830
Recorded Investment			371
Construction Loans [Member] | Multifamily and nonresidential construction [Member]
Loans by class modified as troubled debt restructurings
Number of loans
Pre-Modification outstanding recorded investment
Post-Modification recorded investment
Recorded Investment
Consumer Loans [Member]
Loans by class modified as troubled debt restructurings
Number of loans	20	42	5
Pre-Modification outstanding recorded investment	950	1,783
Post-Modification recorded investment	918	1,752
Recorded Investment			197
Consumer Loans [Member] | Home Equity [Member]
Loans by class modified as troubled debt restructurings
Number of loans	20	42	5
Pre-Modification outstanding recorded investment	950	1,783
Post-Modification recorded investment	918	1,752
Recorded Investment			197
Consumer Loans [Member] | Auto [Member]
Loans by class modified as troubled debt restructurings
Number of loans
Pre-Modification outstanding recorded investment
Post-Modification recorded investment
Recorded Investment
Consumer Loans [Member] | Marine [Member]
Loans by class modified as troubled debt restructurings
Number of loans
Pre-Modification outstanding recorded investment
Post-Modification recorded investment
Recorded Investment
Consumer Loans [Member] | Recreational vehicle [Member]
Loans by class modified as troubled debt restructurings
Number of loans
Pre-Modification outstanding recorded investment
Post-Modification recorded investment
Recorded Investment
Consumer Loans [Member] | Other [Member]
Loans by class modified as troubled debt restructurings
Number of loans
Pre-Modification outstanding recorded investment
Post-Modification recorded investment
Recorded Investment
Commercial Loans [Member]
Loans by class modified as troubled debt restructurings
Number of loans		1
Pre-Modification outstanding recorded investment		446
Post-Modification recorded investment		446
Recorded Investment
Commercial Loans [Member] | Secured [Member]
Loans by class modified as troubled debt restructurings
Number of loans
Pre-Modification outstanding recorded investment
Post-Modification recorded investment
Recorded Investment
Commercial Loans [Member] | Unsecured [Member]
Loans by class modified as troubled debt restructurings
Number of loans		1
Pre-Modification outstanding recorded investment		446
Post-Modification recorded investment		446
Recorded Investment