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Allowance for credit losses (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Allowance For Loan Losses |  |  |  |  |  |
Generic allowance | $ 71,797 |  | $ 72,976 |  | $ 73,747 |
Specific allowance | 954 |  | 0 |  | 14,800 |
Total of allowance for loan losses | 72,751 |  | 72,976 |  | 88,547 | 78,615
Loans |  |  |  |  |  |
Loans with generic allowance | 6,145,173 |  | 5,715,556 |  |  |
Loans with specific allowance | 3,125 |  | 0 |  |  |
Total loans | 6,148,298 | [1] | 5,715,556 | [1] |  |
Corporate [Member] |  |  |  |  |  |
Allowance For Loan Losses |  |  |  |  |  |
Generic allowance | 30,562 |  | 32,488 |  | 34,065 |
Specific allowance | 954 |  | 0 |  | 14,800 |
Total of allowance for loan losses | 31,516 |  | 32,488 |  | 48,865 | 54,160
Loans |  |  |  |  |  |
Loans with generic allowance | 3,310,931 |  | 2,741,251 |  |  |
Loans with specific allowance | 3,125 |  | 0 |  |  |
Total loans | 3,314,056 |  | 2,741,251 |  |  |
Banking and Financial Institutions [Member] |  |  |  |  |  |
Allowance For Loan Losses |  |  |  |  |  |
Generic allowance | 30,865 |  | 28,836 |  | 30,523 |
Specific allowance | 0 |  | 0 |  | 0 |
Total of allowance for loan losses | 30,865 |  | 28,836 |  | 30,523 | 18,790
Loans |  |  |  |  |  |
Loans with generic allowance | 2,259,991 |  | 2,192,023 |  |  |
Loans with specific allowance | 0 |  | 0 |  |  |
Total loans | 2,259,991 |  | 2,192,023 |  |  |
Middle Market Companies [Member] |  |  |  |  |  |
Allowance For Loan Losses |  |  |  |  |  |
Generic allowance | 10,369 |  | 10,887 |  | 8,952 |
Specific allowance | 0 |  | 0 |  | 0 |
Total of allowance for loan losses | 10,369 |  | 10,887 |  | 8,952 | 5,265
Loans |  |  |  |  |  |
Loans with generic allowance | 574,107 |  | 681,912 |  |  |
Loans with specific allowance | 0 |  | 0 |  |  |
Total loans | 574,107 |  | 681,912 |  |  |
Sovereign [Member] |  |  |  |  |  |
Allowance For Loan Losses |  |  |  |  |  |
Generic allowance | 1 |  | 765 |  | 207 |
Specific allowance | 0 |  | 0 |  | 0 |
Total of allowance for loan losses | 1 |  | 765 |  | 207 | 400
Loans |  |  |  |  |  |
Loans with generic allowance | 144 |  | 100,370 |  |  |
Loans with specific allowance | 0 |  | 0 |  |  |
Total loans | $ 144 |  | $ 100,370 |  |  |
[1] | Current ratings as of December 31, 2013 and 2012, respectively.

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -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 7 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. 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=28367877&loc=d3e4428-111522 + Details
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