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Allowance for Loan Losses (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items]          
Allowance for loan losses $ (1,586,000)   $ (1,586,000)   $ (2,499,000)
Commercial [Member]
          
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items]          
Unpaid principal balance of impaired securitized loans 1,776,000   1,776,000   4,724,000
Basis adjustments related to impaired securitized loans 1,000   1,000   8,000
Amortized cost basis of impaired securitized loans 1,777,000   1,777,000   4,732,000
Allowance for loan losses (1,355,000)   (1,355,000)   (2,268,000)
Impaired Financing Receivable, with Related Allowance, Recorded Investment 422,000   422,000   2,464,000
Interest income recognized on impaired securitized loans 25 28 50 56  
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance at beginning of period 1,341,000 4,237,000 2,268,000 4,200,000  
Provision for loan losses 0 200,000 60,000 450,000  
Credit losses, net of recoveries 14,000 (1,368,000) (973,000) (1,581,000)  
Allowance at end of period 1,355,000 3,069,000 1,355,000 3,069,000  
Single-family [Member]
          
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items]          
Unpaid principal balance of impaired securitized loans 3,663,000   3,663,000   3,000,000
Basis adjustments related to impaired securitized loans 55,000   55,000   48,000
Amortized cost basis of impaired securitized loans 3,718,000   3,718,000   3,048,000
Allowance for loan losses (231,000)   (231,000)   (231,000)
Impaired Financing Receivable, with Related Allowance, Recorded Investment 3,487,000   3,487,000   2,817,000
Interest income recognized on impaired securitized loans 51 71 102 143  
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance at beginning of period 231,000 249,000 231,000 270,000  
Provision for loan losses 0 0 0 0  
Credit losses, net of recoveries 0 (41,000) 0 (62,000)  
Allowance at end of period $ 231,000 $ 208,000 $ 231,000 $ 208,000