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Loans and allowance for credit losses (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 | Dec. 31, 2012
Unpaid principal balance | $ 99,674 | $ 105,779 | $ 99,674 | $ 105,779
Recorded investment with no allowance | 65,715 | 77,664 | 65,715 | 77,664
Recorded investment with an allowance | 19,381 | 11,163 | 19,381 | 11,163
Related allowance | 3,312 | 2,201 | 3,312 | 2,201
Average recorded investment | 80,721 | 90,193 | 81,777 | 87,064
Commercial Loan [Member] |  |  |  |
Unpaid principal balance | 1,720 | 1,677 | 1,720 | 1,677
Recorded investment with no allowance | 682 | 715 | 682 | 715
Recorded investment with an allowance | 29 | 0 | 29 | 0
Related allowance | 29 | 0 | 29 | 0
Average recorded investment | 643 | 1,231 | 652 | 1,625
Consumer Loan [Member] |  |  |  |
Unpaid principal balance | 58 | 92 | 58 | 92
Recorded investment with no allowance | 51 | 39 | 51 | 39
Recorded investment with an allowance | 0 | 48 | 0 | 48
Related allowance | 0 | 48 | 0 | 48
Average recorded investment | 51 | 50 | 49 | 55
Residential Real Estate [Member] |  |  |  |
Unpaid principal balance | 29,295 | 24,992 | 29,295 | 24,992
Recorded investment with no allowance | 19,502 | 16,486 | 19,502 | 16,486
Recorded investment with an allowance | 2,936 | 2,063 | 2,936 | 2,063
Related allowance | 377 | 598 | 377 | 598
Average recorded investment | 19,697 | 19,418 | 18,802 | 22,536
Commercial Real Estate [Member] |  |  |  |
Unpaid principal balance | 30,497 | 37,395 | 30,497 | 37,395
Recorded investment with no allowance | 18,638 | 29,718 | 18,638 | 29,718
Recorded investment with an allowance | 8,620 | 2,729 | 8,620 | 2,729
Related allowance | 2,189 | 614 | 2,189 | 614
Average recorded investment | 26,198 | 30,987 | 27,727 | 29,227
Construction Loans [Member] |  |  |  |
Unpaid principal balance | 38,104 | 41,623 | 38,104 | 41,623
Recorded investment with no allowance | 26,842 | 30,706 | 26,842 | 30,706
Recorded investment with an allowance | 7,796 | 6,323 | 7,796 | 6,323
Related allowance | 717 | 941 | 717 | 941
Average recorded investment | 34,132 | 38,507 | 34,547 | 33,621
Impaired Nonaccrual Loans [Member] |  |  |  |
Unpaid principal balance | 49,396 | 53,426 | 49,396 | 53,426
Recorded investment with no allowance | 27,458 | 25,311 | 27,458 | 25,311
Recorded investment with an allowance | 7,360 | 11,163 | 7,360 | 11,163
Related allowance | 1,580 | 2,201 | 1,580 | 2,201
Average recorded investment | 30,329 | 38,624 | 30,731 | 44,468
Impaired Nonaccrual Loans [Member] | Commercial Loan [Member] |  |  |  |
Unpaid principal balance | 1,611 | 1,556 | 1,611 | 1,556
Recorded investment with no allowance | 573 | 594 | 573 | 594
Recorded investment with an allowance | 29 | 0 | 29 | 0
Related allowance | 29 | 0 | 29 | 0
Average recorded investment | 531 | 1,126 | 537 | 1,538
Impaired Nonaccrual Loans [Member] | Consumer Loan [Member] |  |  |  |
Unpaid principal balance | 58 | 92 | 58 | 92
Recorded investment with no allowance | 51 | 39 | 51 | 39
Recorded investment with an allowance | 0 | 48 | 0 | 48
Related allowance | 0 | 48 | 0 | 48
Average recorded investment | 51 | 50 | 49 | 55
Impaired Nonaccrual Loans [Member] | Residential Real Estate [Member] |  |  |  |
Unpaid principal balance | 22,890 | 17,975 | 22,890 | 17,975
Recorded investment with no allowance | 14,948 | 9,469 | 14,948 | 9,469
Recorded investment with an allowance | 1,085 | 2,063 | 1,085 | 2,063
Related allowance | 301 | 598 | 301 | 598
Average recorded investment | 12,883 | 13,294 | 11,920 | 17,472
Impaired Nonaccrual Loans [Member] | Commercial Real Estate [Member] |  |  |  |
Unpaid principal balance | 13,876 | 19,515 | 13,876 | 19,515
Recorded investment with no allowance | 8,135 | 11,838 | 8,135 | 11,838
Recorded investment with an allowance | 2,502 | 2,729 | 2,502 | 2,729
Related allowance | 650 | 614 | 650 | 614
Average recorded investment | 9,784 | 13,554 | 10,824 | 12,975
Impaired Nonaccrual Loans [Member] | Construction Loans [Member] |  |  |  |
Unpaid principal balance | 10,961 | 14,288 | 10,961 | 14,288
Recorded investment with no allowance | 3,751 | 3,371 | 3,751 | 3,371
Recorded investment with an allowance | 3,744 | 6,323 | 3,744 | 6,323
Related allowance | 600 | 941 | 600 | 941
Average recorded investment | 7,080 | 10,600 | 7,401 | 12,428
Impaired Accruing Restructured Loans [Member] |  |  |  |
Unpaid principal balance | 50,278 | 52,353 | 50,278 | 52,353
Recorded investment with no allowance | 38,257 | 52,353 | 38,257 | 52,353
Recorded investment with an allowance | 12,021 | 0 | 12,021 | 0
Related allowance | 1,732 | 0 | 1,732 | 0
Average recorded investment | 50,392 | 51,569 | 51,046 | 42,596
Impaired Accruing Restructured Loans [Member] | Commercial Loan [Member] |  |  |  |
Unpaid principal balance | 109 | 121 | 109 | 121
Recorded investment with no allowance | 109 | 121 | 109 | 121
Recorded investment with an allowance | 0 | 0 | 0 | 0
Related allowance | 0 | 0 | 0 | 0
Average recorded investment | 112 | 105 | 115 | 87
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 | 6,405 | 7,017 | 6,405 | 7,017
Recorded investment with no allowance | 4,554 | 7,017 | 4,554 | 7,017
Recorded investment with an allowance | 1,851 | 0 | 1,851 | 0
Related allowance | 76 | 0 | 76 | 0
Average recorded investment | 6,814 | 6,124 | 6,882 | 5,064
Impaired Accruing Restructured Loans [Member] | Commercial Real Estate [Member] |  |  |  |
Unpaid principal balance | 16,621 | 17,880 | 16,621 | 17,880
Recorded investment with no allowance | 10,503 | 17,880 | 10,503 | 17,880
Recorded investment with an allowance | 6,118 | 0 | 6,118 | 0
Related allowance | 1,539 | 0 | 1,539 | 0
Average recorded investment | 16,414 | 17,433 | 16,903 | 16,252
Impaired Accruing Restructured Loans [Member] | Construction Loans [Member] |  |  |  |
Unpaid principal balance | 27,143 | 27,335 | 27,143 | 27,335
Recorded investment with no allowance | 23,091 | 27,335 | 23,091 | 27,335
Recorded investment with an allowance | 4,052 | 0 | 4,052 | 0
Related allowance | 117 | 0 | 117 | 0
Average recorded investment | $ 27,052 | $ 27,907 | $ 27,146 | $ 21,193

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=28368275&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=28368275&loc=d3e5258-111524 + Details
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X
- 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=28368275&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=28368275&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=28368275&loc=SL6953550-111524 + Details
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