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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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Balance of generic allowance at the end of the reporting period.

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Total loans with Generic allowance at the end of the period.

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Total loans with specific allowance at the end of the period.

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Balance of specific allowance at the end of the reporting period.

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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

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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

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