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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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 11,084,000 |  | $ 11,074,000
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  | 551,000
Impaired Financing Receivable, Recorded Investment | 11,084,000 |  | 11,625,000
Unpaid Principal Balance, With no related allowance recorded | 11,137,000 |  | 11,150,000
Unpaid Principal Balance, With an allowance recorded |  |  | 551,000
Unpaid Principal Balance, Total | 11,137,000 |  | 11,701,000
Average Recorded Investment, Total | 11,101,000 | 13,878,000 |
Interest Income Recognized, Total | 20,000 | 76,000 |
Financing Receivable, Modifications, Recorded Investment | 5,300,000 |  | 5,600,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 0 |  | 9,000,000,000
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 | 253,000 |  | 270,000
Impaired Financing Receivable, Recorded Investment | 253,000 |  | 270,000
Unpaid Principal Balance, With no related allowance recorded | 265,000 |  | 286,000
Unpaid Principal Balance, Total | 265,000 |  | 286,000
Average Recorded Investment, Total | 262,000 | 296,000 |
Interest Income Recognized, Total | 1,000 | 1,000 |
Commercial Real Estate Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 10,831,000 |  | 10,494,000
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  | 551,000
Impaired Financing Receivable, Recorded Investment | 10,831,000 |  | 11,045,000
Unpaid Principal Balance, With no related allowance recorded | 10,872,000 |  | 10,554,000
Unpaid Principal Balance, With an allowance recorded |  |  | 551,000
Unpaid Principal Balance, Total | 10,872,000 |  | 11,105,000
Associated Allowance |  |  | 9,000
Average Recorded Investment, Total | 10,839,000 | 13,197,000 |
Interest Income Recognized, Total | 19,000 | 75,000 |
Commercial Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  |  | 310,000
Impaired Financing Receivable, Recorded Investment |  |  | 310,000
Unpaid Principal Balance, With no related allowance recorded |  |  | 310,000
Unpaid Principal Balance, Total |  |  | 310,000
Average Recorded Investment, Total |  | $ 385,000 |

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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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- Definition Amount of unpaid principal balance of impaired financing receivables for which there is no 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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