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Commitments and contingencies (Tables)
12 Months Ended
Dec. 31, 2012
Schedule Of Fair Value Off Balance Sheet Risks Text Block
   December 31,
(In thousands) 2012 2011
Commitments to extend credit:    
 Credit card lines$ 4,379,071$4,297,755
 Commercial lines of credit  2,044,382 2,039,629
 Other unused credit commitments   351,537 358,572
Commercial letters of credit  20,634 11,632
Standby letters of credit  127,519 124,709
Commitments to originate mortgage loans  41,187 53,323