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Loans and allowance for credit losses (Details 6) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2011
--- | --- | --- | ---
Loans individually evaluated for impairment | $ 90,227 |  | $ 72,510
Loans collectively evaluated for impairment | 717,803 |  | 790,056
Total loans | 808,030 | 841,050 | 862,566
Allowance for credit losses allocated to: |  |  |
Loans individually evaluated for impairment | 19 |  | 90
Loans collectively evaluated for impairment | 12,936 |  | 13,540
Total allowance for credit losses | 12,955 | 14,288 | 13,540
Unallocated Financing Receivables [Member] |  |  |
Loans individually evaluated for impairment | 0 |  | 0
Loans collectively evaluated for impairment | 0 |  | 0
Total loans | 0 |  | 0
Allowance for credit losses allocated to: |  |  |
Loans individually evaluated for impairment | 0 |  | 0
Loans collectively evaluated for impairment | 0 |  | 246
Total allowance for credit losses | 0 |  | 246
Commercial Loan [Member] |  |  |
Loans individually evaluated for impairment | 1,646 |  | 1,690
Loans collectively evaluated for impairment | 59,885 |  | 69,792
Total loans | 61,531 | 69,485 | 71,482
Allowance for credit losses allocated to: |  |  |
Loans individually evaluated for impairment | 0 |  | 0
Loans collectively evaluated for impairment | 1,536 |  | 1,553
Total allowance for credit losses | 1,536 |  | 1,553
Consumer Loan [Member] |  |  |
Loans individually evaluated for impairment | 54 |  | 40
Loans collectively evaluated for impairment | 13,458 |  | 14,726
Total loans | 13,512 | 14,639 | 14,766
Allowance for credit losses allocated to: |  |  |
Loans individually evaluated for impairment | 0 |  | 0
Loans collectively evaluated for impairment | 304 |  | 610
Total allowance for credit losses | 304 |  | 610
Residential Real Estate [Member] |  |  |
Loans individually evaluated for impairment | 19,671 |  | 19,944
Loans collectively evaluated for impairment | 282,778 |  | 307,811
Total loans | 302,449 | 321,604 | 327,755
Allowance for credit losses allocated to: |  |  |
Loans individually evaluated for impairment | 0 |  | 90
Loans collectively evaluated for impairment | 4,187 |  | 3,952
Total allowance for credit losses | 4,187 |  | 4,042
Commercial Real Estate [Member] |  |  |
Loans individually evaluated for impairment | 28,902 |  | 23,410
Loans collectively evaluated for impairment | 292,915 |  | 298,134
Total loans | 321,817 | 315,439 | 321,544
Allowance for credit losses allocated to: |  |  |
Loans individually evaluated for impairment | 0 |  | 0
Loans collectively evaluated for impairment | 3,601 |  | 3,691
Total allowance for credit losses | 3,601 |  | 3,691
Construction Loans [Member] |  |  |
Loans individually evaluated for impairment | 39,954 |  | 27,426
Loans collectively evaluated for impairment | 68,767 |  | 99,593
Total loans | 108,721 | 119,883 | 127,019
Allowance for credit losses allocated to: |  |  |
Loans individually evaluated for impairment | 19 |  | 0
Loans collectively evaluated for impairment | 3,308 |  | 3,398
Total allowance for credit losses | $ 3,327 |  | $ 3,398

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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 valuation allowance for financing receivables that are expected to be uncollectible that were individually 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 The balance of financing receivables 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 (h) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually 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 (h) -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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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -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. + Details
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