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Allowance for Loan Losses Financing Receivable and Allowance Element by Class (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 12,720 | $ 12,500 | $ 12,954 | $ 13,000
Specific Reserves Evaluated Individually for Impairment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 3,105 | 3,539 | 2,348 |
General Reserves Based on Historical Loss Experience [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 4,315 | 4,304 | 4,532 |
Reserve for Qualitative Factors [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 4,211 | 3,815 | 4,375 |
Unallocated Reserves [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 1,089 | 842 | 1,699 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 5,879 | 5,865 | 5,862 | 5,659
Commercial Real Estate Portfolio Segment [Member] | Specific Reserves Evaluated Individually for Impairment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 1,473 | 1,523 | 944 |
Commercial Real Estate Portfolio Segment [Member] | General Reserves Based on Historical Loss Experience [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 2,177 | 2,369 | 2,648 |
Commercial Real Estate Portfolio Segment [Member] | Reserve for Qualitative Factors [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 2,229 | 1,973 | 2,270 |
Commercial Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 1,064 | 1,359 | 704 | 658
Commercial Construction [Member] | Specific Reserves Evaluated Individually for Impairment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 760 | 969 | 117 |
Commercial Construction [Member] | General Reserves Based on Historical Loss Experience [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 150 | 213 | 316 |
Commercial Construction [Member] | Reserve for Qualitative Factors [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 154 | 177 | 271 |
Commercial Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 2,115 | 2,050 | 2,125 | 2,063
Commercial Other [Member] | Specific Reserves Evaluated Individually for Impairment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 535 | 652 | 480 |
Commercial Other [Member] | General Reserves Based on Historical Loss Experience [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 781 | 763 | 886 |
Commercial Other [Member] | Reserve for Qualitative Factors [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 799 | 635 | 759 |
Municipal [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 18 | 18 | 19 | 19
Municipal [Member] | Specific Reserves Evaluated Individually for Impairment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses |  | 0 | 0 |
Municipal [Member] | General Reserves Based on Historical Loss Experience [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses |  | 0 | 0 |
Municipal [Member] | Reserve for Qualitative Factors [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 18 | 18 | 19 |
Residential Term [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 1,113 | 1,109 | 1,236 | 1,159
Residential Term [Member] | Specific Reserves Evaluated Individually for Impairment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 337 | 395 | 592 |
Residential Term [Member] | General Reserves Based on Historical Loss Experience [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 336 | 278 | 185 |
Residential Term [Member] | Reserve for Qualitative Factors [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 440 | 436 | 459 |
Residential Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 9 | 11 | 59 | 255
Residential Construction [Member] | Specific Reserves Evaluated Individually for Impairment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 0 | 49 |
Residential Construction [Member] | General Reserves Based on Historical Loss Experience [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 4 | 4 | 2 |
Residential Construction [Member] | Reserve for Qualitative Factors [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 5 | 7 | 8 |
Home Equity [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 859 | 654 | 682 | 595
Home Equity [Member] | Specific Reserves Evaluated Individually for Impairment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 0 | 156 |
Home Equity [Member] | General Reserves Based on Historical Loss Experience [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 522 | 315 | 176 |
Home Equity [Member] | Reserve for Qualitative Factors [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 337 | 339 | 350 |
Consumer Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 574 | 592 | 568 | 584
Consumer Portfolio Segment [Member] | Specific Reserves Evaluated Individually for Impairment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 0 | 0 | 10 |
Consumer Portfolio Segment [Member] | General Reserves Based on Historical Loss Experience [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 345 | 362 | 319 |
Consumer Portfolio Segment [Member] | Reserve for Qualitative Factors [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 229 | 230 | 239 |
Unallocated Financing Receivables [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 1,089 | 842 | 1,699 | 2,008
Unallocated Financing Receivables [Member] | Unallocated Reserves [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 1,089 | $ 842 | $ 1,699 |

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 8 -Subparagraph a(ii) -Chapter V -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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