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Loans and allowance for credit losses (Details 2) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Troubled Debt Restructurings [Member] |  |
Number of contract | 62 | 50
Premodification outstanding recorded investment | $ 57,372 | $ 40,395
Postmodification outstanding recorded investment | 42,218 | 37,142
Troubled Debt Restructurings That Subsequently Defaulted [Member] |  |
Number of contract | 23 | 18
Recorded investment | 13,082 | 14,862
Commercial Loan [Member] | Troubled Debt Restructurings [Member] |  |
Number of contract | 2 | 1
Premodification outstanding recorded investment | 125 | 69
Postmodification outstanding recorded investment | 114 | 69
Commercial Loan [Member] | Troubled Debt Restructurings That Subsequently Defaulted [Member] |  |
Number of contract | 1 | 0
Recorded investment | 46 | 0
Consumer Loan [Member] | Troubled Debt Restructurings [Member] |  |
Number of contract | 1 | 0
Premodification outstanding recorded investment | 30 | 0
Postmodification outstanding recorded investment | 28 | 0
Consumer Loan [Member] | Troubled Debt Restructurings That Subsequently Defaulted [Member] |  |
Number of contract | 1 | 0
Recorded investment | 28 | 0
Residential Real Estate [Member] | Troubled Debt Restructurings [Member] |  |
Number of contract | 26 | 20
Premodification outstanding recorded investment | 13,530 | 11,471
Postmodification outstanding recorded investment | 12,283 | 10,359
Residential Real Estate [Member] | Troubled Debt Restructurings That Subsequently Defaulted [Member] |  |
Number of contract | 12 | 10
Recorded investment | 8,163 | 7,353
Commercial Real Estate [Member] | Troubled Debt Restructurings [Member] |  |
Number of contract | 19 | 20
Premodification outstanding recorded investment | 21,814 | 15,874
Postmodification outstanding recorded investment | 18,633 | 14,175
Commercial Real Estate [Member] | Troubled Debt Restructurings That Subsequently Defaulted [Member] |  |
Number of contract | 5 | 5
Recorded investment | 3,557 | 6,751
Construction Loans [Member] | Troubled Debt Restructurings [Member] |  |
Number of contract | 14 | 9
Premodification outstanding recorded investment | 21,873 | 12,981
Postmodification outstanding recorded investment | 18,366 | 12,539
Construction Loans [Member] | Troubled Debt Restructurings That Subsequently Defaulted [Member] |  |
Number of contract | 4 | 3
Recorded investment | $ 1,288 | $ 758

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- Definition Amount of investment in financing receivables (after modification) modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524 + Details
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- Definition Amount of investment in financing receivables (before modification) modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524 + Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6951948&loc=d3e18845-111554 + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953682-111524 + Details
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