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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 |

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6951948&loc=d3e18845-111554 + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953682-111524 + Details
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6951948&loc=d3e18845-111554 + Details
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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524 + Details
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- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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