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Commitments and contingencies (Tables)
6 Months Ended
Jun. 30, 2012
Commitments and contingencies [Abstract]  
Company's significant commitments
                 
    June 30,
2012
    December 31,
2011
 
    (in thousands)  

Commitments to extend credit

               

Home equity lines of credit

  $ 6,369,114       6,393,332  

Commercial real estate loans to be sold

    134,471       177,982  

Other commercial real estate and construction

    3,138,855       2,818,071  

Residential real estate loans to be sold

    771,278       182,474  

Other residential real estate

    438,197       129,466  

Commercial and other

    10,004,023       10,442,754  

Standby letters of credit

    3,811,819       3,930,271  

Commercial letters of credit

    56,725       44,981  

Financial guarantees and indemnification contracts

    1,895,755       1,903,254  

Commitments to sell real estate loans

    1,068,940       635,899