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Offsetting of financial assets and liabilities (Details 1) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Offsetting Of financial Assets And Liabilities [Line Items] |  |
Derivative Liability, Gross amounts of liabilities | $ 294,806 | $ 202,452
Derivative Liability, Gross amounts offset in the balance sheet | 0 | (27)
Derivative Liability, Net amount of liabilities presented in the balance sheet | 294,806 | 202,425
Derivative, Gross amounts not offset in the balance sheet, Financial instruments | (285,471) | (157,705)
Derivative, Gross amounts not offset in the balance sheet, Cash collateral pledged | (6,031) | (11,518)
Derivative Liability, Gross amounts not offset in the balance sheet, Net amount | 3,304 | 33,202
Securities Sold under Agreements to Repurchase [Member] |  |
Offsetting Of financial Assets And Liabilities [Line Items] |  |
Derivative Liability, Gross amounts of liabilities | 286,162 | 158,374
Derivative Liability, Gross amounts offset in the balance sheet | 0 | 0
Derivative Liability, Net amount of liabilities presented in the balance sheet | 286,162 | 158,374
Derivative, Gross amounts not offset in the balance sheet, Financial instruments | (285,471) | (157,705)
Derivative, Gross amounts not offset in the balance sheet, Cash collateral pledged | (691) | (669)
Derivative Liability, Gross amounts not offset in the balance sheet, Net amount | 0 | 0
Derivative [Member] |  |
Offsetting Of financial Assets And Liabilities [Line Items] |  |
Derivative Liability, Gross amounts of liabilities | 8,644 | 44,078
Derivative Liability, Gross amounts offset in the balance sheet | 0 | (27)
Derivative Liability, Net amount of liabilities presented in the balance sheet | 8,644 | 44,051
Derivative, Gross amounts not offset in the balance sheet, Financial instruments | 0 | 0
Derivative, Gross amounts not offset in the balance sheet, Cash collateral pledged | (5,340) | (10,849)
Derivative Liability, Gross amounts not offset in the balance sheet, Net amount | 3,304 | 33,202
Designated as Hedging Instrument [Member] |  |
Offsetting Of financial Assets And Liabilities [Line Items] |  |
Derivative Liability, Gross amounts of liabilities | 8,572 | 11,747
Derivative Liability, Gross amounts offset in the balance sheet | 0 | 0
Derivative Liability, Net amount of liabilities presented in the balance sheet | 8,572 | 11,747
Trading Liabilities [Member] |  |
Offsetting Of financial Assets And Liabilities [Line Items] |  |
Derivative Liability, Gross amounts of liabilities | 72 | 32,331
Derivative Liability, Gross amounts offset in the balance sheet | 0 | (27)
Derivative Liability, Net amount of liabilities presented in the balance sheet | $ 72 | $ 32,304

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- Definition Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 + Details
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- Definition Amount of right to receive securities collateral under master netting arrangements that have not been offset against derivative liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 + Details
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- Definition Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against the right to receive collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226016-175313 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 + Details
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- Definition Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226003-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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