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Derivative financial instruments for hedging purposes (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Total | $ 11,461 | $ (5,093) | $ (3,740)
Fair Value Hedging [Member] |  |  |
Total | 12,311 | (17,042) | (4,517)
Derivative Assets (Liabilities), at Fair Value, Net | (24,380) | 19,922 | 7,049
Net Gain Loss On Derivative and Hedge Item | (12,069) | 2,880 | 2,532
Fair Value Hedging [Member] | Interest Rate Swap [Member] | Interest Expense [Member] |  |  |
Total | 1,564 |  |
Derivative Assets (Liabilities), at Fair Value, Net | (12,022) |  |
Net Gain Loss On Derivative and Hedge Item | (10,458) |  |
Fair Value Hedging [Member] | Interest Rate Swap [Member] | Interest Income Available For Sale [Member] |  |  |
Total | (2,982) | (6,857) | (14,760)
Derivative Assets (Liabilities), at Fair Value, Net | 4,776 | 10,266 | 22,000
Net Gain Loss On Derivative and Hedge Item | 1,794 | 3,409 | 7,240
Fair Value Hedging [Member] | Interest Rate Swap [Member] | Derivative Financial Instruments and Hedging [Member] |  |  |
Total |  | 74 | 419
Derivative Assets (Liabilities), at Fair Value, Net |  | 0 | 0
Net Gain Loss On Derivative and Hedge Item |  | 74 | 419
Fair Value Hedging [Member] | Interest Rate Swap [Member] | Derivative Financial Instruments and Hedging (Ineffectiveness) [Member] |  |  |
Total | 59 |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  |
Net Gain Loss On Derivative and Hedge Item | 59 |  |
Fair Value Hedging [Member] | Cross Currency Interest Rate Contract [Member] | Interest Income [Member] |  |  |
Total | (239) | (33) | (45)
Derivative Assets (Liabilities), at Fair Value, Net | 522 | 55 | 89
Net Gain Loss On Derivative and Hedge Item | 283 | 22 | 44
Fair Value Hedging [Member] | Cross Currency Interest Rate Contract [Member] | Interest Expense [Member] |  |  |
Total | 8,024 | 4,352 | 3,812
Derivative Assets (Liabilities), at Fair Value, Net | (11,187) | (7,874) | (7,046)
Net Gain Loss On Derivative and Hedge Item | (3,163) | (3,522) | (3,234)
Fair Value Hedging [Member] | Cross Currency Interest Rate Contract [Member] | Foreign Currency Gain (Loss) [Member] |  |  |
Total | 5,873 | (17,427) | 7,922
Derivative Assets (Liabilities), at Fair Value, Net | (6,469) | 17,475 | (7,994)
Net Gain Loss On Derivative and Hedge Item | (596) | 48 | (72)
Fair Value Hedging [Member] | Cross Currency Interest Rate Contract [Member] | Derivative Financial Instruments and Hedging (Ineffectiveness) [Member] |  |  |
Total | 12 | 2,849 | (1,865)
Derivative Assets (Liabilities), at Fair Value, Net | 0 | 0 | 0
Net Gain Loss On Derivative and Hedge Item | $ 12 | $ 2,849 | $ (1,865)

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- Definition Gain (loss) incurred in hedging activities. + References No definition available. + Details
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- Definition Gain (loss) on derivative and hedged item during the period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + Details
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