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Allowance for loan losses (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
loans
Sep. 30, 2011
loans
Sep. 30, 2012
loans
Sep. 30, 2011
loans
Dec. 31, 2011
loans
Mar. 31, 2011
Financing Receivable, Impaired [Line Items]            
Financing Receivable, Modifications, Number of Contracts 2,964,000 2,502,000 2,964,000 2,502,000 2,502,000  
Financing Receivable, Modifications, Recorded Investment $ 166,327 $ 129,979 $ 166,327 $ 129,979 $ 150,356  
Financing Receivable, Modifications, Unpaid Principal Balance 215,236 154,309 215,236 154,309 185,587  
Activity within the allowance for noncovered loan losses:            
Certain Loans Acquired in Transfer, Accretable Yield (128,024) (191,508) (128,024) (191,508)    
Noncovered Loans [Member]
            
Financing Receivable, Impaired [Line Items]            
Financing Receivable, Modifications, Number of Contracts 85,000 44,000 85,000 44,000 64,000  
Financing Receivable, Modifications, Recorded Investment 23,753 12,607 23,753 12,607 15,002  
Financing Receivable, Modifications, Unpaid Principal Balance 33,810 17,036 33,810 17,036 20,980  
Activity within the allowance for noncovered loan losses:            
Allowance for loan losses, beginning balance 103,849   107,699 114,690   109,187
Charge-offs 20,999 20,014 53,430 63,784    
Recoveries 6,127 5,410 17,813 16,521    
Provision for noncovered loan losses 9,965 14,604 26,860 41,760    
Allowance for loan losses, ending balance 98,942 109,187 98,942 109,187   109,187
Noncovered Loans [Member] | Commercial and Industrial Financing Receivable [Member]
            
Financing Receivable, Impaired [Line Items]            
Financing Receivable, Modifications, Number of Contracts 22,000 8,000 22,000 8,000 14,000  
Financing Receivable, Modifications, Recorded Investment 2,413 1,096 2,413 1,096 2,512  
Financing Receivable, Modifications, Unpaid Principal Balance 8,478 2,654 8,478 2,654 4,336  
Noncovered Loans [Member] | Commercial Portfolio Segment [Member]
            
Activity within the allowance for noncovered loan losses:            
Allowance for loan losses, beginning balance 40,327   32,363 29,764   28,366
Charge-offs (8,773) 4,528 (19,906) (13,517)    
Recoveries 1,408 540 3,120 1,254    
Provision for noncovered loan losses 6,197 5,960 23,582 12,837    
Allowance for loan losses, ending balance 39,159 30,338 39,159 30,338   28,366
Noncovered Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
            
Activity within the allowance for noncovered loan losses:            
Allowance for loan losses, beginning balance 27,186   31,857 32,026   32,946
Charge-offs (727) 3,304 (3,496) (7,763)    
Recoveries 180 6 825 54    
Provision for noncovered loan losses (1,461) 3,653 (4,008) 8,984    
Allowance for loan losses, ending balance 25,178 33,301 25,178 33,301   32,946
Noncovered Loans [Member] | Commercial Construction Financing Receivable Portfolio Segment [Member]
            
Activity within the allowance for noncovered loan losses:            
Allowance for loan losses, beginning balance 5,147   5,173 7,180   7,876
Charge-offs (127) 550 (165) (3,245)    
Recoveries 61 171 364 545    
Provision for noncovered loan losses (277) (682) (568) 2,335    
Allowance for loan losses, ending balance 4,804 6,815 4,804 6,815   7,876
Noncovered Loans [Member] | Finance Leases Portfolio Segment [Member]
            
Activity within the allowance for noncovered loan losses:            
Allowance for loan losses, beginning balance 358   341 475   353
Charge-offs 0 651 0 (778)    
Recoveries 0 1 38 35    
Provision for noncovered loan losses 148 622 127 593    
Allowance for loan losses, ending balance 506 325 506 325   353
Noncovered Loans [Member] | Installment Financing Receivable Portfolio Segment [Member]
            
Activity within the allowance for noncovered loan losses:            
Allowance for loan losses, beginning balance 13,029   17,981 21,555   18,089
Charge-offs (5,507) 5,911 (14,441) (20,204)    
Recoveries 2,883 3,375 9,104 10,812    
Provision for noncovered loan losses 1,430 2,770 (809) 6,160    
Allowance for loan losses, ending balance 11,835 18,323 11,835 18,323   18,089
Noncovered Loans [Member] | Home Equity Receivable Portfolio Segment [Member]
            
Activity within the allowance for noncovered loan losses:            
Allowance for loan losses, beginning balance 5,449   6,766 7,217   7,142
Charge-offs (2,784) 2,779 (7,373) (8,356)    
Recoveries 1,007 658 2,588 1,840    
Provision for noncovered loan losses 1,213 1,222 2,904 5,542    
Allowance for loan losses, ending balance 4,885 6,243 4,885 6,243   7,142
Noncovered Loans [Member] | Credit Card Receivables Portfolio Segment [Member]
            
Activity within the allowance for noncovered loan losses:            
Allowance for loan losses, beginning balance 6,690   7,369 11,107   8,403
Charge-offs (1,390) 1,520 (4,618) (6,135)    
Recoveries 488 585 1,583 1,789    
Provision for noncovered loan losses 1,447 528 2,901 1,235    
Allowance for loan losses, ending balance 7,235 7,996 7,235 7,996   8,403
Noncovered Loans [Member] | Residential Portfolio Segment [Member]
            
Activity within the allowance for noncovered loan losses:            
Allowance for loan losses, beginning balance 5,663   5,849 5,366   6,012
Charge-offs (1,691) 771 (3,431) (3,786)    
Recoveries 100 74 191 192    
Provision for noncovered loan losses 1,268 531 2,731 4,074    
Allowance for loan losses, ending balance 5,340 5,846 5,340 5,846   6,012
Noncovered Loans [Member] | Commercial Real Estate [Member]
            
Financing Receivable, Impaired [Line Items]            
Financing Receivable, Modifications, Number of Contracts 36,000 20,000 36,000 20,000 28,000  
Financing Receivable, Modifications, Recorded Investment 17,763 8,068 17,763 8,068 9,167  
Financing Receivable, Modifications, Unpaid Principal Balance 21,307 10,725 21,307 10,725 12,659  
Noncovered Loans [Member] | Commercial Real Estate Construction Financing Receivable [Member]
            
Financing Receivable, Impaired [Line Items]            
Financing Receivable, Modifications, Number of Contracts 27,000 16,000 27,000 16,000 22,000  
Financing Receivable, Modifications, Recorded Investment 3,577 3,443 3,577 3,443 3,323  
Financing Receivable, Modifications, Unpaid Principal Balance 4,025 3,657 4,025 3,657 3,985  
Noncovered Consumer Loans [Member]
            
Financing Receivable, Impaired [Line Items]            
Financing Receivable, Modifications, Number of Contracts 2,803,000 2,424,000 2,803,000 2,424,000 2,394,000  
Financing Receivable, Modifications, Recorded Investment 65,835 57,742 65,835 57,742 57,934  
Financing Receivable, Modifications, Unpaid Principal Balance 70,188 59,172 70,188 59,172 59,601  
Noncovered Consumer Loans [Member] | Consumer Installment [Member]
            
Financing Receivable, Impaired [Line Items]            
Financing Receivable, Modifications, Number of Contracts 1,840,000 1,568,000 1,840,000 1,568,000 1,547,000  
Financing Receivable, Modifications, Recorded Investment 32,577 34,654 32,577 34,654 33,571  
Financing Receivable, Modifications, Unpaid Principal Balance 34,414 34,703 34,414 34,703 33,723  
Noncovered Consumer Loans [Member] | Consumer Home Equity Lines Financing Receivable [Member]
            
Financing Receivable, Impaired [Line Items]            
Financing Receivable, Modifications, Number of Contracts 229,000 166,000 229,000 166,000 174,000  
Financing Receivable, Modifications, Recorded Investment 6,922 4,413 6,922 4,413 4,763  
Financing Receivable, Modifications, Unpaid Principal Balance 7,202 4,412 7,202 4,412 4,763  
Noncovered Consumer Loans [Member] | Consumer Credit Card Financing Receivable [Member]
            
Financing Receivable, Impaired [Line Items]            
Financing Receivable, Modifications, Number of Contracts 426,000 529,000 426,000 529,000 496,000  
Financing Receivable, Modifications, Recorded Investment 1,767 2,359 1,767 2,359 2,202  
Financing Receivable, Modifications, Unpaid Principal Balance 1,767 2,359 1,767 2,359 2,202  
Noncovered Consumer Loans [Member] | Consumer Residential Mortgages Financing Receivable [Member]
            
Financing Receivable, Impaired [Line Items]            
Financing Receivable, Modifications, Number of Contracts 308,000 161,000 308,000 161,000 177,000  
Financing Receivable, Modifications, Recorded Investment 24,569 16,316 24,569 16,316 17,398  
Financing Receivable, Modifications, Unpaid Principal Balance 26,805 17,698 26,805 17,698 18,913  
Covered Loans [Member]
            
Financing Receivable, Impaired [Line Items]            
Financing Receivable, Modifications, Number of Contracts 46,000 34,000 46,000 34,000 44,000  
Financing Receivable, Modifications, Recorded Investment 71,997 59,630 71,997 59,630 77,420  
Financing Receivable, Modifications, Unpaid Principal Balance 106,464 78,101 106,464 78,101 105,006  
Covered Loans [Member] | Commercial and Industrial Financing Receivable [Member]
            
Financing Receivable, Impaired [Line Items]            
Financing Receivable, Modifications, Number of Contracts 11,000 8,000 11,000 8,000 15,000  
Financing Receivable, Modifications, Recorded Investment 5,278 7,287 5,278 7,287 7,578  
Financing Receivable, Modifications, Unpaid Principal Balance 6,216 10,901 6,216 10,901 10,812  
Covered Loans [Member] | Commercial Real Estate [Member]
            
Financing Receivable, Impaired [Line Items]            
Financing Receivable, Modifications, Number of Contracts 25,000 15,000 25,000 15,000 21,000  
Financing Receivable, Modifications, Recorded Investment 52,079 41,403 52,079 41,403 57,786  
Financing Receivable, Modifications, Unpaid Principal Balance 57,681 45,282 57,681 45,282 62,159  
Covered Loans [Member] | Commercial Real Estate Construction Financing Receivable [Member]
            
Financing Receivable, Impaired [Line Items]            
Financing Receivable, Modifications, Number of Contracts 10,000 11,000 10,000 11,000 8,000  
Financing Receivable, Modifications, Recorded Investment 14,640 10,940 14,640 10,940 12,056  
Financing Receivable, Modifications, Unpaid Principal Balance 42,567 21,918 42,567 21,918 32,035  
Covered Loans [Member] | Consumer Home Equity Lines Financing Receivable [Member]
            
Financing Receivable, Impaired [Line Items]            
Financing Receivable, Modifications, Number of Contracts 30,000   30,000      
Financing Receivable, Modifications, Recorded Investment 4,742   4,742      
Financing Receivable, Modifications, Unpaid Principal Balance $ 4,774   $ 4,774