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Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Beginning Balance | $ 8,349 |  | $ 8,068 |  | $ 8,068 |
Charge-offs | (754) |  | (700) |  |  |
Recoveries | 25 |  | 23 |  |  |
Provision for loan losses | 671 |  | 672 |  |  |
Ending Balance | 8,291 |  | 8,063 |  | 8,349 |
Allowance for Loan Losses [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 273 |  |  |  | 554 |
Collectively evaluated for impairment | 8,018 |  |  |  | 7,795 |
Total | 8,291 |  | 8,063 |  | 8,349 |
Loans [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 17,258 |  |  |  | 18,456 |
Collectively evaluated for impairment | 558,607 |  |  |  | 574,659 |
Total | 575,865 |  |  |  | 593,115 |
Ratios for allowance for loan losses [Abstract] |  |  |  |  |  |
Ratio of allowance for loan losses to the end of period loans, net of unearned income and deferred fees (in hundredths) | 1.44% |  | 1.38% |  | 1.41% |
Ratio of net charge-offs to average loans, net of unearned income and deferred fees (in hundredths) | 0.50% | [1] | 0.46% | [1] | 0.49% | [1]
Nonperforming assets [Abstract] |  |  |  |  |  |
Nonaccrual loans | 10,734 |  | 1,789 |  | 10,870 |
Restructured loans in nonaccrual | 1,691 |  | 3,539 |  | 2,151 |
Total nonperforming loans | 12,425 |  | 5,328 |  | 13,021 |
Other real estate owned, net | 1,094 |  | 940 |  | 1,435 |
Total nonperforming assets | 13,519 |  | 6,268 |  | 14,456 |
Ratio of nonperforming assets to loans, net of unearned income and deferred fees, plus other real estate owned (in hundredths) | 2.35% |  | 1.07% |  | 2.44% |
Ratio of allowance for loan losses to nonperforming loans (in hundredths) | 66.73% | [2] | 151.33% | [2] | 64.12% | [2]
Number of days loans past due, minimum | 90 days |  |  |  |  |
Summary of loans past due 90 days or more and impaired loans [Abstract] |  |  |  |  |  |
Loans past due 90 days or more and still accruing | 568 |  | 210 |  | 170 |
Ratio of loans past due 90 days or more and still accruing to loans, net of unearned income and deferred fees (in hundredths) | 0.10% |  | 0.04% |  | 0.03% |
Accruing restructured loans | 5,732 |  | 3,742 |  | 2,005 |
Impaired loans: |  |  |  |  |  |
Impaired loans with no valuation allowance | 16,263 |  | 9,933 |  | 16,974 |
Impaired loans with a valuation allowance | 995 |  | 3,054 |  | 1,482 |
Total impaired loans | 17,258 |  | 12,987 |  | 18,456 |
Valuation allowance | (273) |  | (593) |  | (554) |
Impaired loans, net of allowance | 16,985 |  | 12,394 |  | 17,902 |
Average recorded investment in impaired loans | 17,935 | [3],[4] | 14,555 | [3] | 13,540 | [3],[4]
Income recognized on impaired loans, after designation as impaired | 10 |  | 24 |  | 9 |
Amount of income recognized on a cash basis | 0 |  | 0 |  | 0 |
Real Estate Construction [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Beginning Balance | 1,070 |  | 1,079 |  | 1,079 |
Charge-offs | (184) |  | 0 |  |  |
Recoveries | 0 |  | 0 |  |  |
Provision for loan losses | 287 |  | (405) |  |  |
Ending Balance | 1,173 |  | 674 |  |  |
Allowance for Loan Losses [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  | 0 |
Collectively evaluated for impairment | 1,173 |  |  |  | 1,070 |
Total | 1,173 |  | 674 |  |  |
Loans [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 6,492 |  |  |  | 6,643 |
Collectively evaluated for impairment | 44,356 |  |  |  | 43,670 |
Total | 50,848 |  |  |  | 50,313 |
Consumer Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Beginning Balance | 2,263 |  | 1,245 |  | 1,245 |
Charge-offs | (53) |  | (95) |  |  |
Recoveries | 0 |  | 0 |  |  |
Provision for loan losses | (364) |  | 1,102 |  |  |
Ending Balance | 1,846 |  | 2,252 |  |  |
Allowance for Loan Losses [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  | 43 |
Collectively evaluated for impairment | 1,846 |  |  |  | 2,220 |
Total | 1,846 |  | 2,252 |  |  |
Loans [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 478 |  |  |  | 864 |
Collectively evaluated for impairment | 139,216 |  |  |  | 142,398 |
Total | 139,694 |  |  |  | 143,262 |
Commercial Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Beginning Balance | 3,442 |  | 3,515 |  | 3,515 |
Charge-offs | (35) |  | (537) |  |  |
Recoveries | 0 |  | 0 |  |  |
Provision for loan losses | (118) |  | 242 |  |  |
Ending Balance | 3,289 |  | 3,220 |  |  |
Allowance for Loan Losses [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 269 |  |  |  | 273 |
Collectively evaluated for impairment | 3,020 |  |  |  | 3,169 |
Total | 3,289 |  | 3,220 |  |  |
Loans [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 9,927 |  |  |  | 10,329 |
Collectively evaluated for impairment | 284,651 |  |  |  | 293,979 |
Total | 294,578 |  |  |  | 304,308 |
Consumer Non Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Beginning Balance | 424 |  | 403 |  | 403 |
Charge-offs | (78) |  | (68) |  |  |
Recoveries | 9 |  | 23 |  |  |
Provision for loan losses | 230 |  | 124 |  |  |
Ending Balance | 585 |  | 482 |  |  |
Allowance for Loan Losses [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 3 |  |  |  | 7 |
Collectively evaluated for impairment | 582 |  |  |  | 417 |
Total | 585 |  | 482 |  |  |
Loans [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 43 |  |  |  | 46 |
Collectively evaluated for impairment | 28,538 |  |  |  | 31,668 |
Total | 28,581 |  |  |  | 31,714 |
Commercial Non Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Beginning Balance | 959 |  | 1,473 |  | 1,473 |
Charge-offs | (404) |  | 0 |  |  |
Recoveries | 16 |  | 0 |  |  |
Provision for loan losses | 705 |  | (347) |  |  |
Ending Balance | 1,276 |  | 1,126 |  |  |
Allowance for Loan Losses [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 1 |  |  |  | 231 |
Collectively evaluated for impairment | 1,275 |  |  |  | 728 |
Total | 1,276 |  | 1,126 |  |  |
Loans [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 318 |  |  |  | 574 |
Collectively evaluated for impairment | 35,160 |  |  |  | 36,775 |
Total | 35,478 |  |  |  | 37,349 |
Public Sector and IDA [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Beginning Balance | 142 |  | 232 |  | 232 |
Charge-offs | 0 |  | 0 |  |  |
Recoveries | 0 |  | 0 |  |  |
Provision for loan losses | (32) |  | (147) |  |  |
Ending Balance | 110 |  | 85 |  | 142 |
Allowance for Loan Losses [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  | 0 |
Collectively evaluated for impairment | 110 |  |  |  | 142 |
Total | 110 |  | 85 |  | 142 |
Loans [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  | 0 |
Collectively evaluated for impairment | 26,686 |  |  |  | 26,169 |
Total | 26,686 |  |  |  | 26,169 |
Nonperforming assets [Abstract] |  |  |  |  |  |
Total nonperforming loans | 0 |  |  |  | 0 |
Summary of loans past due 90 days or more and impaired loans [Abstract] |  |  |  |  |  |
Loans past due 90 days or more and still accruing | 0 |  |  |  | 0 |
Impaired loans: |  |  |  |  |  |
Total impaired loans | 0 |  |  |  | 0 |
Valuation allowance | 0 |  |  |  | 0 |
Average recorded investment in impaired loans | 0 | [4] |  |  | 0 | [4]
Income recognized on impaired loans, after designation as impaired | 0 |  |  |  | 0 |
Unallocated [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |
Beginning Balance | 49 |  | 121 |  | 121 |
Charge-offs | 0 |  | 0 |  |  |
Recoveries | 0 |  | 0 |  |  |
Provision for loan losses | (37) |  | 103 |  |  |
Ending Balance | 12 |  | 224 |  |  |
Allowance for Loan Losses [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  | 0 |
Collectively evaluated for impairment | 12 |  |  |  | 49 |
Total | 12 |  | 224 |  |  |
Loans [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  |  |  | 0 |
Collectively evaluated for impairment | 0 |  |  |  | 0 |
Total | $ 0 |  |  |  | $ 0 |
[1] | Net charge-offs are on an annualized basis.
[2] | The Company defines nonperforming loans as nonaccrual loans. Loans 90 days or more past due and still accruing and accruing restructured loans are excluded.
[3] | Recorded investment includes principal, accrued interest and net deferred fees.
[4] | Recorded investment includes the unpaid principal balance and any accrued interest and net deferred fees.

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- Definition Reflects the percentage derived from dividing the nonperforming assets by total loans net of unearned income deferred fees plus other real estate owned. + References No definition available. + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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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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