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Loans and leases and the allowance for credit losses - Changes in Allowance for Credit Losses (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance $ 917,028 $ 907,589 $ 908,290 $ 902,941
Provision for credit losses 46,000 58,000 155,000 196,000
Charge-offs (50,096) (66,496) (174,534) (221,240)
Recoveries 8,291 9,432 32,467 30,824
Net charge-offs (41,805) (57,064) (142,067) (190,416)
Ending balance 921,223 908,525 921,223 908,525
Commercial, financial, leasing, etc [Member]
       
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 244,728 209,879 234,022 212,579
Provision for credit losses 439 23,145 29,663 44,957
Charge-offs (8,874) (12,073) (32,989) (41,023)
Recoveries 1,174 2,613 6,771 7,051
Net charge-offs (7,700) (9,460) (26,218) (33,972)
Ending balance 237,467 223,564 237,467 223,564
Real Estate Commercial [Member]
       
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 341,521 401,111 367,637 400,562
Provision for credit losses 9,891 (545) 4,322 36,965
Charge-offs (7,982) (13,712) (31,578) (54,206)
Recoveries 1,421 839 4,470 4,372
Net charge-offs (6,561) (12,873) (27,108) (49,834)
Ending balance 344,851 387,693 344,851 387,693
Residential real estate [Member]
       
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 93,269 87,341 91,915 86,351
Provision for credit losses 8,247 8,264 30,064 37,759
Charge-offs (8,687) (12,135) (32,812) (44,174)
Recoveries 1,139 1,750 4,801 5,284
Net charge-offs (7,548) (10,385) (28,011) (38,890)
Ending balance 93,968 85,220 93,968 85,220
Consumer [Member]
       
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 164,352 137,309 143,121 133,067
Provision for credit losses 26,962 27,231 88,927 74,847
Charge-offs (24,553) (28,576) (77,155) (81,837)
Recoveries 4,557 4,230 16,425 14,117
Net charge-offs (19,996) (24,346) (60,730) (67,720)
Ending balance 171,318 140,194 171,318 140,194
Unallocated [Member]
       
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 73,158 71,949 71,595 70,382
Provision for credit losses 461 (95) 2,024 1,472
Charge-offs         
Recoveries         
Net charge-offs         
Ending balance $ 73,619 $ 71,854 $ 73,619 $ 71,854