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Offsetting of financial assets and liabilities (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
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