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Loans and allowance for credit losses (Details 1) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011
Unpaid principal balance | $ 103,034 | $ 90,043
Recorded investment with no allowance | 82,117 | 71,847
Recorded investment with an allowance | 3,072 | 4,731
Related allowance | 920 | 1,466
Average recorded investment | 79,199 | 74,007
Commercial Loan [Member] |  |
Unpaid principal balance | 2,246 | 2,188
Recorded investment with no allowance | 1,677 | 1,738
Recorded investment with an allowance | 0 | 0
Related allowance | 0 | 0
Average recorded investment | 1,956 | 2,650
Consumer Loan [Member] |  |
Unpaid principal balance | 59 | 30
Recorded investment with no allowance | 55 | 28
Recorded investment with an allowance | 0 | 0
Related allowance | 0 | 0
Average recorded investment | 46 | 32
Residential Real Estate [Member] |  |
Unpaid principal balance | 29,956 | 26,223
Recorded investment with no allowance | 24,596 | 20,717
Recorded investment with an allowance | 812 | 3,181
Related allowance | 420 | 1,296
Average recorded investment | 23,801 | 21,523
Commercial Real Estate [Member] |  |
Unpaid principal balance | 30,475 | 26,938
Recorded investment with no allowance | 24,453 | 23,578
Recorded investment with an allowance | 2,260 | 0
Related allowance | 500 | 0
Average recorded investment | 25,478 | 22,584
Construction Loans [Member] |  |
Unpaid principal balance | 40,298 | 34,664
Recorded investment with no allowance | 31,336 | 25,786
Recorded investment with an allowance | 0 | 1,550
Related allowance | 0 | 170
Average recorded investment | 27,918 | 27,218
Impaired Nonaccrual Loans [Member] |  |
Unpaid principal balance | 65,803 | 64,835
Recorded investment with no allowance | 44,886 | 46,639
Recorded investment with an allowance | 3,072 | 4,731
Related allowance | 920 | 1,466
Average recorded investment | 50,354 | 49,180
Impaired Nonaccrual Loans [Member] | Commercial Loan [Member] |  |
Unpaid principal balance | 2,178 | 2,119
Recorded investment with no allowance | 1,609 | 1,669
Recorded investment with an allowance | 0 | 0
Related allowance | 0 | 0
Average recorded investment | 1,905 | 2,539
Impaired Nonaccrual Loans [Member] | Consumer Loan [Member] |  |
Unpaid principal balance | 59 | 30
Recorded investment with no allowance | 55 | 28
Recorded investment with an allowance | 0 | 0
Related allowance | 0 | 0
Average recorded investment | 46 | 32
Impaired Nonaccrual Loans [Member] | Residential Real Estate [Member] |  |
Unpaid principal balance | 24,948 | 22,431
Recorded investment with no allowance | 19,588 | 16,925
Recorded investment with an allowance | 812 | 3,181
Related allowance | 420 | 1,296
Average recorded investment | 20,221 | 15,430
Impaired Nonaccrual Loans [Member] | Commercial Real Estate [Member] |  |
Unpaid principal balance | 15,398 | 17,372
Recorded investment with no allowance | 9,376 | 14,012
Recorded investment with an allowance | 2,260 | 0
Related allowance | 500 | 0
Average recorded investment | 12,968 | 14,624
Impaired Nonaccrual Loans [Member] | Construction Loans [Member] |  |
Unpaid principal balance | 23,220 | 22,883
Recorded investment with no allowance | 14,258 | 14,005
Recorded investment with an allowance | 0 | 1,550
Related allowance | 0 | 170
Average recorded investment | 15,214 | 16,555
Impaired Accruing Restructured Loans [Member] |  |
Unpaid principal balance | 37,231 | 25,208
Recorded investment with no allowance | 37,231 | 25,208
Recorded investment with an allowance | 0 | 0
Related allowance | 0 | 0
Average recorded investment | 28,845 | 24,827
Impaired Accruing Restructured Loans [Member] | Commercial Loan [Member] |  |
Unpaid principal balance | 68 | 69
Recorded investment with no allowance | 68 | 69
Recorded investment with an allowance | 0 | 0
Related allowance | 0 | 0
Average recorded investment | 51 | 111
Impaired Accruing Restructured Loans [Member] | Consumer Loan [Member] |  |
Unpaid principal balance | 0 | 0
Recorded investment with no allowance | 0 | 0
Recorded investment with an allowance | 0 | 0
Related allowance | 0 | 0
Average recorded investment | 0 | 0
Impaired Accruing Restructured Loans [Member] | Residential Real Estate [Member] |  |
Unpaid principal balance | 5,008 | 3,792
Recorded investment with no allowance | 5,008 | 3,792
Recorded investment with an allowance | 0 | 0
Related allowance | 0 | 0
Average recorded investment | 3,580 | 6,093
Impaired Accruing Restructured Loans [Member] | Commercial Real Estate [Member] |  |
Unpaid principal balance | 15,077 | 9,566
Recorded investment with no allowance | 15,077 | 9,566
Recorded investment with an allowance | 0 | 0
Related allowance | 0 | 0
Average recorded investment | 12,510 | 7,960
Impaired Accruing Restructured Loans [Member] | Construction Loans [Member] |  |
Unpaid principal balance | 17,078 | 11,781
Recorded investment with no allowance | 17,078 | 11,781
Recorded investment with an allowance | 0 | 0
Related allowance | 0 | 0
Average recorded investment | $ 12,704 | $ 10,663

X
- 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 allowance for credit losses related to recorded investment. + 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)(3) -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 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 investment in 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 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524 + Details
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- Definition Amount of investment in impaired financing receivables for which there is 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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