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Fair value of financial instruments (Details 1) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Financial assets: |  |  |  |
Instruments with carrying value that approximates fair value (carrying value) | $ 746,006 |  | $ 882,762 |
Securities held-to-maturity (carrying value) | 34,113 |  | 26,536 |
Loans, net of allowance (carrying value) | 5,635,480 | [1] | 4,864,329 | [2]
Instruments with carrying value that approximates fair value (Fair value) | 746,006 |  | 882,762 |
Securities held-to-maturity (Fair value) | 34,149 |  | 26,637 |
Loans, net of allowance (Fair value) | 5,784,172 | [1] | 4,913,473 | [2]
Financial liabilities: |  |  |  |
Instruments with carrying value that approximates fair value (carrying value) | 2,494,734 |  | 2,693,408 |
Short-term borrowings | 1,449,023 |  | 1,323,466 |
Borrowings and long-term debt (carrying value) | 1,905,540 |  | 1,487,548 |
Commitments to extend credit, standby letters of credit, and financial guarantees written (carrying value) | 5,781 |  | 10,497 |
Instruments with carrying value that approximates fair value (Fair value) | 2,494,824 |  | 2,692,832 |
Short-term borrowings (Fair value) | 1,453,159 |  | 1,319,350 |
Borrowings and long-term debt (Fair value) | 1,922,544 |  | 1,441,919 |
Commitments to extend credit, standby letters of credit, and financial guarantees written (Fair value) | 4,841 |  | 9,807 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Financial assets: |  |  |  |
Instruments with carrying value that approximates fair value (Fair value) | 0 |  |  |
Securities held-to-maturity (Fair value) | 19,444 |  |  |
Loans, net of allowance (Fair value) | 0 | [1] |  |
Financial liabilities: |  |  |  |
Instruments with carrying value that approximates fair value (Fair value) | 0 |  |  |
Short-term borrowings (Fair value) | 0 |  |  |
Borrowings and long-term debt (Fair value) | 0 |  |  |
Commitments to extend credit, standby letters of credit, and financial guarantees written (Fair value) | 0 |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Financial assets: |  |  |  |
Instruments with carrying value that approximates fair value (Fair value) | 746,006 |  |  |
Securities held-to-maturity (Fair value) | 14,705 |  |  |
Loans, net of allowance (Fair value) | 5,784,172 | [1] |  |
Financial liabilities: |  |  |  |
Instruments with carrying value that approximates fair value (Fair value) | 2,494,824 |  |  |
Short-term borrowings (Fair value) | 1,453,159 |  |  |
Borrowings and long-term debt (Fair value) | 1,922,544 |  |  |
Commitments to extend credit, standby letters of credit, and financial guarantees written (Fair value) | 4,841 |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Financial assets: |  |  |  |
Instruments with carrying value that approximates fair value (Fair value) | 0 |  |  |
Securities held-to-maturity (Fair value) | 0 |  |  |
Loans, net of allowance (Fair value) | 0 | [1] |  |
Financial liabilities: |  |  |  |
Instruments with carrying value that approximates fair value (Fair value) | 0 |  |  |
Short-term borrowings (Fair value) | 0 |  |  |
Borrowings and long-term debt (Fair value) | 0 |  |  |
Commitments to extend credit, standby letters of credit, and financial guarantees written (Fair value) | $ 0 |  |  |
[1] | The carrying value of loans is net of the Allowance for loan losses of $73.0 million for December 31, 2012.
[2] | The carrying value of loans is net of the Allowance for loan losses of $88.5 million for December 31, 2011.

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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. 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=6375948&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.9-03.16) -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 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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