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Credit Quality and Allowance for Loan Losses (Details 6) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Schedule of debtor troubled debt restructuring, current period    
Current $ 851 $ 598
Past Due Greater Than 30 days      
Nonaccrual TDRs 1,952 117
Total TDRs 2,803 715
Total real estate loans [Member]
    
Schedule of debtor troubled debt restructuring, current period    
Current 802 532
Past Due Greater Than 30 days      
Nonaccrual TDRs 1,952 117
Total TDRs 2,754 649
Total real estate loans [Member] | One- to four-family first mortgage [Member]
    
Schedule of debtor troubled debt restructuring, current period    
Current 303  
Past Due Greater Than 30 days      
Total TDRs 303  
Total real estate loans [Member] | Home equity loans and lines [Member]
    
Schedule of debtor troubled debt restructuring, current period    
Current   15
Past Due Greater Than 30 days      
Total TDRs   15
Total real estate loans [Member] | Commercial real estate [Member]
    
Schedule of debtor troubled debt restructuring, current period    
Current 308 319
Past Due Greater Than 30 days      
Nonaccrual TDRs 1,274 117
Total TDRs 1,582 436
Total real estate loans [Member] | Construction and land [Member]
    
Schedule of debtor troubled debt restructuring, current period    
Current 191 198
Past Due Greater Than 30 days      
Total TDRs 191 198
Total real estate loans [Member] | Multi-family residential [Member]
    
Schedule of debtor troubled debt restructuring, current period    
Past Due Greater Than 30 days      
Nonaccrual TDRs 678  
Total TDRs 678  
Total other loans [Member]
    
Schedule of debtor troubled debt restructuring, current period    
Current 49 66
Past Due Greater Than 30 days      
Total TDRs 49 66
Total other loans [Member] | Commercial and industrial [Member]
    
Schedule of debtor troubled debt restructuring, current period    
Current 12 22
Past Due Greater Than 30 days      
Total TDRs 12 22
Total other loans [Member] | Consumer [Member]
    
Schedule of debtor troubled debt restructuring, current period    
Current 37 44
Past Due Greater Than 30 days      
Total TDRs $ 37 $ 44