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Loans and allowance for credit losses (Details 1) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2012 | Dec. 31, 2011
Unpaid principal balance | $ 105,049 | $ 90,043 | $ 105,049 | $ 90,043
Recorded investment with no allowance | 90,208 | 71,847 | 90,208 | 71,847
Recorded investment with an allowance | 19 | 4,731 | 19 | 4,731
Related allowance | 19 | 1,466 | 19 | 1,466
Average recorded investment | 86,945 | 73,814 | 82,823 | 74,007
Commercial Loan [Member] |  |  |  |
Unpaid principal balance | 2,213 | 2,188 | 2,213 | 2,188
Recorded investment with no allowance | 1,646 | 1,738 | 1,646 | 1,738
Recorded investment with an allowance | 0 | 0 | 0 | 0
Related allowance | 0 | 0 | 0 | 0
Average recorded investment | 1,651 | 1,715 | 1,834 | 2,650
Consumer Loan [Member] |  |  |  |
Unpaid principal balance | 58 | 30 | 58 | 30
Recorded investment with no allowance | 54 | 28 | 54 | 28
Recorded investment with an allowance | 0 | 0 | 0 | 0
Related allowance | 0 | 0 | 0 | 0
Average recorded investment | 55 | 34 | 50 | 32
Residential Real Estate [Member] |  |  |  |
Unpaid principal balance | 25,655 | 26,223 | 25,655 | 26,223
Recorded investment with no allowance | 19,671 | 20,717 | 19,671 | 20,717
Recorded investment with an allowance | 0 | 3,181 | 0 | 3,181
Related allowance | 0 | 1,296 | 0 | 1,296
Average recorded investment | 22,212 | 21,274 | 23,178 | 21,523
Commercial Real Estate [Member] |  |  |  |
Unpaid principal balance | 33,135 | 26,938 | 33,135 | 26,938
Recorded investment with no allowance | 28,902 | 23,578 | 28,902 | 23,578
Recorded investment with an allowance | 0 | 0 | 0 | 0
Related allowance | 0 | 0 | 0 | 0
Average recorded investment | 27,478 | 23,494 | 26,740 | 22,584
Construction Loans [Member] |  |  |  |
Unpaid principal balance | 43,988 | 34,664 | 43,988 | 34,664
Recorded investment with no allowance | 39,935 | 25,786 | 39,935 | 25,786
Recorded investment with an allowance | 19 | 1,550 | 19 | 1,550
Related allowance | 19 | 170 | 19 | 170
Average recorded investment | 35,549 | 27,297 | 31,021 | 27,218
Impaired Nonaccrual Loans [Member] |  |  |  |
Unpaid principal balance | 54,264 | 64,835 | 54,264 | 64,835
Recorded investment with no allowance | 39,423 | 46,639 | 39,423 | 46,639
Recorded investment with an allowance | 19 | 4,731 | 19 | 4,731
Related allowance | 19 | 1,466 | 19 | 1,466
Average recorded investment | 42,935 | 49,744 | 47,014 | 49,180
Impaired Nonaccrual Loans [Member] | Commercial Loan [Member] |  |  |  |
Unpaid principal balance | 2,124 | 2,119 | 2,124 | 2,119
Recorded investment with no allowance | 1,557 | 1,669 | 1,557 | 1,669
Recorded investment with an allowance | 0 | 0 | 0 | 0
Related allowance | 0 | 0 | 0 | 0
Average recorded investment | 1,572 | 1,680 | 1,760 | 2,539
Impaired Nonaccrual Loans [Member] | Consumer Loan [Member] |  |  |  |
Unpaid principal balance | 58 | 30 | 58 | 30
Recorded investment with no allowance | 54 | 28 | 54 | 28
Recorded investment with an allowance | 0 | 0 | 0 | 0
Related allowance | 0 | 0 | 0 | 0
Average recorded investment | 55 | 34 | 50 | 32
Impaired Nonaccrual Loans [Member] | Residential Real Estate [Member] |  |  |  |
Unpaid principal balance | 20,424 | 22,431 | 20,424 | 22,431
Recorded investment with no allowance | 14,440 | 16,925 | 14,440 | 16,925
Recorded investment with an allowance | 0 | 3,181 | 0 | 3,181
Related allowance | 0 | 1,296 | 0 | 1,296
Average recorded investment | 17,092 | 18,118 | 18,920 | 15,430
Impaired Nonaccrual Loans [Member] | Commercial Real Estate [Member] |  |  |  |
Unpaid principal balance | 16,149 | 17,372 | 16,149 | 17,372
Recorded investment with no allowance | 11,916 | 14,012 | 11,916 | 14,012
Recorded investment with an allowance | 0 | 0 | 0 | 0
Related allowance | 0 | 0 | 0 | 0
Average recorded investment | 11,446 | 13,545 | 12,567 | 14,624
Impaired Nonaccrual Loans [Member] | Construction Loans [Member] |  |  |  |
Unpaid principal balance | 15,509 | 22,883 | 15,509 | 22,883
Recorded investment with no allowance | 11,456 | 14,005 | 11,456 | 14,005
Recorded investment with an allowance | 19 | 1,550 | 19 | 1,550
Related allowance | 19 | 170 | 19 | 170
Average recorded investment | 12,770 | 16,367 | 13,717 | 16,555
Impaired Accruing Restructured Loans [Member] |  |  |  |
Unpaid principal balance | 50,785 | 25,208 | 50,785 | 25,208
Recorded investment with no allowance | 50,785 | 25,208 | 50,785 | 25,208
Recorded investment with an allowance | 0 | 0 | 0 | 0
Related allowance | 0 | 0 | 0 | 0
Average recorded investment | 44,010 | 24,070 | 35,809 | 24,827
Impaired Accruing Restructured Loans [Member] | Commercial Loan [Member] |  |  |  |
Unpaid principal balance | 89 | 69 | 89 | 69
Recorded investment with no allowance | 89 | 69 | 89 | 69
Recorded investment with an allowance | 0 | 0 | 0 | 0
Related allowance | 0 | 0 | 0 | 0
Average recorded investment | 79 | 35 | 74 | 111
Impaired Accruing Restructured Loans [Member] | Consumer Loan [Member] |  |  |  |
Unpaid principal balance | 0 | 0 | 0 | 0
Recorded investment with no allowance | 0 | 0 | 0 | 0
Recorded investment with an allowance | 0 | 0 | 0 | 0
Related allowance | 0 | 0 | 0 | 0
Average recorded investment | 0 | 0 | 0 | 0
Impaired Accruing Restructured Loans [Member] | Residential Real Estate [Member] |  |  |  |
Unpaid principal balance | 5,231 | 3,792 | 5,231 | 3,792
Recorded investment with no allowance | 5,231 | 3,792 | 5,231 | 3,792
Recorded investment with an allowance | 0 | 0 | 0 | 0
Related allowance | 0 | 0 | 0 | 0
Average recorded investment | 5,120 | 3,156 | 4,258 | 6,093
Impaired Accruing Restructured Loans [Member] | Commercial Real Estate [Member] |  |  |  |
Unpaid principal balance | 16,986 | 9,566 | 16,986 | 9,566
Recorded investment with no allowance | 16,986 | 9,566 | 16,986 | 9,566
Recorded investment with an allowance | 0 | 0 | 0 | 0
Related allowance | 0 | 0 | 0 | 0
Average recorded investment | 16,032 | 9,949 | 14,173 | 7,960
Impaired Accruing Restructured Loans [Member] | Construction Loans [Member] |  |  |  |
Unpaid principal balance | 28,479 | 11,781 | 28,479 | 11,781
Recorded investment with no allowance | 28,479 | 11,781 | 28,479 | 11,781
Recorded investment with an allowance | 0 | 0 | 0 | 0
Related allowance | 0 | 0 | 0 | 0
Average recorded investment | $ 22,779 | $ 10,930 | $ 17,304 | $ 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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