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Derivative financial instruments for hedging purposes (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain (loss) on derivatives | $ 3,479 | $ 11,461 | $ (5,093)
Fair Value Hedging [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain (loss) on derivatives | (3,994) | 12,311 | (17,042)
Gain (loss) on hedged item | (11,559) | (24,380) | 19,922
Net gain (loss) | (15,553) | (12,069) | 2,880
Fair Value Hedging [Member] | Interest Rate Swap [Member] | Interest Income [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain (loss) on derivatives | (39) |  |
Gain (loss) on hedged item | 350 |  |
Net gain (loss) | 311 |  |
Fair Value Hedging [Member] | Interest Rate Swap [Member] | Interest Expense [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain (loss) on derivatives | 3,192 | 1,564 | 0
Gain (loss) on hedged item | (16,204) | (12,022) | 0
Net gain (loss) | (13,012) | (10,458) | 0
Fair Value Hedging [Member] | Interest Rate Swap [Member] | Interest Income Available For Sale [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain (loss) on derivatives | (3,088) | (2,982) | (6,857)
Gain (loss) on hedged item | 4,649 | 4,776 | 10,266
Net gain (loss) | 1,561 | 1,794 | 3,409
Fair Value Hedging [Member] | Interest Rate Swap [Member] | Derivative Financial Instruments and Hedging [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain (loss) on derivatives | (3,622) | 59 | 74
Gain (loss) on hedged item | 3,942 | 0 | 0
Net gain (loss) | 320 | 59 | 74
Fair Value Hedging [Member] | Cross Currency Interest Rate Contract [Member] | Interest Income [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain (loss) on derivatives | (795) | (239) | (33)
Gain (loss) on hedged item | 1,548 | 522 | 55
Net gain (loss) | 753 | 283 | 22
Fair Value Hedging [Member] | Cross Currency Interest Rate Contract [Member] | Interest Expense [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain (loss) on derivatives | 6,905 | 8,024 | 4,352
Gain (loss) on hedged item | (12,452) | (11,187) | (7,874)
Net gain (loss) | (5,547) | (3,163) | (3,522)
Fair Value Hedging [Member] | Cross Currency Interest Rate Contract [Member] | Foreign Currency Gain (Loss) [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain (loss) on derivatives | (430) | 5,873 | (17,427)
Gain (loss) on hedged item | 458 | (6,469) | 17,475
Net gain (loss) | 28 | (596) | 48
Fair Value Hedging [Member] | Cross Currency Interest Rate Contract [Member] | Derivative Financial Instruments and Hedging [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Gain (loss) on derivatives | (6,117) | 12 | 2,849
Gain (loss) on hedged item | 6,150 | 0 | 0
Net gain (loss) | $ 33 | $ 12 | $ 2,849

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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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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: 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 Reference 2: 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 + Details
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