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Loans and allowance for credit losses (Details 1) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans individually evaluated for impairment | $ 44,489 | $ 40,714
Loans collectively evaluated for impairment | 659,148 | 671,205
Total loans | 703,637 | 711,919
Allowance for credit losses allocated to: |  |
Loans individually evaluated for impairment | 2,208 | 783
Loans collectively evaluated for impairment | 7,861 | 9,942
Total allowance for credit losses | 10,069 | 10,725
Construction Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans individually evaluated for impairment | 9,517 | 5,569
Loans collectively evaluated for impairment | 57,295 | 59,022
Total loans | 66,812 | 64,591
Allowance for credit losses allocated to: |  |
Loans individually evaluated for impairment | 341 | 204
Loans collectively evaluated for impairment | 1,656 | 1,756
Total allowance for credit losses | 1,997 | 1,960
Residential Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans individually evaluated for impairment | 19,791 | 19,748
Loans collectively evaluated for impairment | 250,689 | 255,109
Total loans | 270,480 | 274,857
Allowance for credit losses allocated to: |  |
Loans individually evaluated for impairment | 258 | 285
Loans collectively evaluated for impairment | 1,828 | 3,569
Total allowance for credit losses | 2,086 | 3,854
Commercial Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans individually evaluated for impairment | 14,296 | 14,462
Loans collectively evaluated for impairment | 287,851 | 290,143
Total loans | 302,147 | 304,605
Allowance for credit losses allocated to: |  |
Loans individually evaluated for impairment | 1,510 | 44
Loans collectively evaluated for impairment | 3,074 | 2,985
Total allowance for credit losses | 4,584 | 3,029
Commercial Loan [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans individually evaluated for impairment | 843 | 887
Loans collectively evaluated for impairment | 53,171 | 56,308
Total loans | 54,014 | 57,195
Allowance for credit losses allocated to: |  |
Loans individually evaluated for impairment | 72 | 245
Loans collectively evaluated for impairment | 605 | 1,021
Total allowance for credit losses | 677 | 1,266
Consumer Loan [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loans individually evaluated for impairment | 42 | 48
Loans collectively evaluated for impairment | 10,142 | 10,623
Total loans | 10,184 | 10,671
Allowance for credit losses allocated to: |  |
Loans individually evaluated for impairment | 27 | 5
Loans collectively evaluated for impairment | 281 | 238
Total allowance for credit losses | 308 | 243
Unallocated Financing Receivables [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
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 | 417 | 373
Total allowance for credit losses | $ 417 | $ 373

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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=28368275&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=28368275&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=28368275&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=28368275&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 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 2: 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 3: 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 4: 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=28367877&loc=d3e4428-111522 + Details
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