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Loans Receivable and Allowance for Loan Losses (Impaired Loans and Related Interest Income by Loan Portfolio Class) (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment $ 6,093,000   $ 6,093,000   $ 6,807,000
Impaired Financing Receivable, with Related Allowance, Recorded Investment 6,529,000   6,529,000   6,823,000
Impaired Financing Receivable, Recorded Investment 12,622,000   12,622,000   13,630,000
Unpaid Principal Balance, With no related allowance recorded 6,193,000   6,193,000   6,978,000
Unpaid Principal Balance, With an allowance recorded 6,529,000   6,529,000   6,823,000
Unpaid Principal Balance, Total 12,722,000   12,722,000   13,801,000
Average Recorded Investment, Total 13,366,000 15,818,000 13,622,000 15,849,000  
Interest Income Recognized, Total 62,000 155,000 210,000 380,000  
Financing Receivable, Modifications, Recorded Investment 6,100,000   6,100,000   7,200,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down     78,000   1,200,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment         0
New Loans Identified as Troubled Debt Restructurings         0
Residential Real Estate Loans [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 271,000   271,000   343,000
Impaired Financing Receivable, Recorded Investment 271,000   271,000   343,000
Unpaid Principal Balance, With no related allowance recorded 291,000   291,000   385,000
Unpaid Principal Balance, Total 291,000   291,000   385,000
Average Recorded Investment, Total 272,000   284,000    
Interest Income Recognized, Total 2,000   4,000    
Commercial Real Estate Loans [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 5,585,000   5,585,000   5,866,000
Impaired Financing Receivable, with Related Allowance, Recorded Investment 6,529,000   6,529,000   6,823,000
Impaired Financing Receivable, Recorded Investment 12,114,000   12,114,000   12,689,000
Unpaid Principal Balance, With no related allowance recorded 5,665,000   5,665,000   5,995,000
Unpaid Principal Balance, With an allowance recorded 6,529,000   6,529,000   6,823,000
Unpaid Principal Balance, Total 12,194,000   12,194,000   12,818,000
Associated Allowance 89,000   89,000   1,231,000
Average Recorded Investment, Total 12,783,000 15,426,000 12,937,000 15,454,000  
Interest Income Recognized, Total 60,000 145,000 206,000 320,000  
Commercial Loans [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 237,000   237,000   598,000
Impaired Financing Receivable, Recorded Investment 237,000   237,000   598,000
Unpaid Principal Balance, With no related allowance recorded 237,000   237,000   598,000
Unpaid Principal Balance, Total 237,000   237,000   598,000
Average Recorded Investment, Total 311,000 392,000 401,000 395,000  
Interest Income Recognized, Total   $ 10,000   $ 60,000