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Loans and Leases (Allowance for Credit Losses and Recorded Investment in Financing Receivables) (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
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for credit losses, Beginning Balance $ 190,628 $ 189,292 $ 188,100 $ 191,834  
Charge-offs (24,583) (27,427) (81,902) (105,024)  
Recoveries 4,852 4,095 29,699 16,150  
Provision 16,000 25,000 51,000 88,000  
Allowance for credit losses, Ending Balance 186,897 190,960 186,897 190,960  
Individually evaluated for impairment 17,624 17,608 17,624 17,608  
Collectively evaluated for impairment 169,273 173,352 169,273 173,352  
Financing receivables, Ending Balance 12,675,607 9,702,669 12,675,607 9,702,669 10,447,930
Financing receivables, Individually evaluated for impairment, Ending Balance 285,064 169,651 285,064 169,651  
Financing receivables, Collectively evaluated for impairment, Ending Balance 12,390,543 9,533,018 12,390,543 9,533,018  
Legacy Loans And Leases [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Individually evaluated for impairment 15,877   15,877    
Collectively evaluated for impairment 169,273   169,273    
Financing receivables, Ending Balance 10,399,602   10,399,602   9,833,296
Financing receivables, Individually evaluated for impairment, Ending Balance 117,046   117,046    
Financing receivables, Collectively evaluated for impairment, Ending Balance 10,282,556   10,282,556    
Purchased Loans And Leases [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Individually evaluated for impairment 1,747   1,747    
Collectively evaluated for impairment 0   0    
Financing receivables, Ending Balance 2,276,005   2,276,005   614,634
Financing receivables, Individually evaluated for impairment, Ending Balance 168,018   168,018    
Financing receivables, Collectively evaluated for impairment, Ending Balance 2,107,987   2,107,987    
Commercial [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for credit losses, Beginning Balance 30,062 29,358 28,567 31,608  
Charge-offs (7,003) (6,445) (20,572) (21,386)  
Recoveries 3,246 1,123 7,562 3,226  
Provision 962 4,557 11,710 15,145  
Allowance for credit losses, Ending Balance 27,267 28,593 27,267 28,593  
Individually evaluated for impairment 907 3,064 907 3,064  
Collectively evaluated for impairment 26,360 25,528 26,360 25,528  
Financing receivables, Ending Balance 2,168,708 1,810,664 2,168,708 1,810,664  
Financing receivables, Individually evaluated for impairment, Ending Balance 30,970 18,041 30,970 18,041  
Financing receivables, Collectively evaluated for impairment, Ending Balance 2,137,738 1,792,623 2,137,738 1,792,623  
Commercial [Member] | Legacy Loans And Leases [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Individually evaluated for impairment 907   907    
Collectively evaluated for impairment 26,360   26,360    
Financing receivables, Individually evaluated for impairment, Ending Balance 13,532   13,532    
Financing receivables, Collectively evaluated for impairment, Ending Balance 1,943,900   1,943,900    
Commercial [Member] | Purchased Loans And Leases [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Individually evaluated for impairment 0   0    
Collectively evaluated for impairment 0   0    
Financing receivables, Individually evaluated for impairment, Ending Balance 17,438   17,438    
Financing receivables, Collectively evaluated for impairment, Ending Balance 193,838   193,838    
Real Estate - Construction [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for credit losses, Beginning Balance 31,670 44,432 36,868 50,250  
Charge-offs (3,280) (7,227) (12,795) (27,189)  
Recoveries 371 738 2,069 6,194  
Provision 1,144 3,015 3,763 11,703  
Allowance for credit losses, Ending Balance 29,905 40,958 29,905 40,958  
Individually evaluated for impairment 1,837 1,478 1,837 1,478  
Collectively evaluated for impairment 28,068 39,481 28,068 39,481  
Financing receivables, Ending Balance 904,285 771,734 904,285 771,734  
Financing receivables, Individually evaluated for impairment, Ending Balance 48,891 37,296 48,891 37,296  
Financing receivables, Collectively evaluated for impairment, Ending Balance 855,394 734,438 855,394 734,438  
Real Estate - Construction [Member] | Legacy Loans And Leases [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Individually evaluated for impairment 1,309   1,309    
Collectively evaluated for impairment 28,068   28,068    
Financing receivables, Individually evaluated for impairment, Ending Balance 21,157   21,157    
Financing receivables, Collectively evaluated for impairment, Ending Balance 652,551   652,551    
Real Estate - Construction [Member] | Purchased Loans And Leases [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Individually evaluated for impairment 528   528    
Collectively evaluated for impairment 0   0    
Financing receivables, Individually evaluated for impairment, Ending Balance 27,734   27,734    
Financing receivables, Collectively evaluated for impairment, Ending Balance 202,843   202,843    
Real Estate Secured - Residential [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for credit losses, Beginning Balance 33,794 29,990 28,839 28,320  
Charge-offs (2,896) (5,476) (10,338) (15,604)  
Recoveries 426 214 1,663 1,497  
Provision 8,649 4,991 19,809 15,506  
Allowance for credit losses, Ending Balance 39,973 29,719 39,973 29,719  
Individually evaluated for impairment 5,837 2,550 5,837 2,550  
Collectively evaluated for impairment 34,136 27,169 34,136 27,169  
Financing receivables, Ending Balance 4,047,761 2,728,934 4,047,761 2,728,934  
Financing receivables, Individually evaluated for impairment, Ending Balance 48,795 27,836 48,795 27,836  
Financing receivables, Collectively evaluated for impairment, Ending Balance 3,998,966 2,701,098 3,998,966 2,701,098  
Real Estate Secured - Residential [Member] | Legacy Loans And Leases [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Individually evaluated for impairment 4,872   4,872    
Collectively evaluated for impairment 34,136   34,136    
Financing receivables, Individually evaluated for impairment, Ending Balance 22,432   22,432    
Financing receivables, Collectively evaluated for impairment, Ending Balance 3,151,668   3,151,668    
Real Estate Secured - Residential [Member] | Purchased Loans And Leases [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Individually evaluated for impairment 965   965    
Collectively evaluated for impairment 0   0    
Financing receivables, Individually evaluated for impairment, Ending Balance 26,363   26,363    
Financing receivables, Collectively evaluated for impairment, Ending Balance 847,298   847,298    
Real Estate Secured - Commercial [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for credit losses, Beginning Balance 78,500 72,554 78,414 70,137  
Charge-offs (9,833) (6,712) (32,910) (33,446)  
Recoveries 394 1,100 16,715 2,925  
Provision 4,278 11,072 11,120 38,398  
Allowance for credit losses, Ending Balance 73,339 78,014 73,339 78,014  
Individually evaluated for impairment 8,926 10,368 8,926 10,368  
Collectively evaluated for impairment 64,413 67,646 64,413 67,646  
Financing receivables, Ending Balance 3,947,447 3,013,787 3,947,447 3,013,787  
Financing receivables, Individually evaluated for impairment, Ending Balance 155,985 86,330 155,985 86,330  
Financing receivables, Collectively evaluated for impairment, Ending Balance 3,791,462 2,927,457 3,791,462 2,927,457  
Real Estate Secured - Commercial [Member] | Legacy Loans And Leases [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Individually evaluated for impairment 8,672   8,672    
Collectively evaluated for impairment 64,413   64,413    
Financing receivables, Individually evaluated for impairment, Ending Balance 59,619   59,619    
Financing receivables, Collectively evaluated for impairment, Ending Balance 2,939,893   2,939,893    
Real Estate Secured - Commercial [Member] | Purchased Loans And Leases [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Individually evaluated for impairment 254   254    
Collectively evaluated for impairment 0   0    
Financing receivables, Individually evaluated for impairment, Ending Balance 96,366   96,366    
Financing receivables, Collectively evaluated for impairment, Ending Balance 851,569   851,569    
Consumer [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for credit losses, Beginning Balance 3,314 2,755 3,297 2,841  
Charge-offs (616) (483) (2,341) (3,175)  
Recoveries 168 582 912 1,128  
Provision 553 634 1,551 2,694  
Allowance for credit losses, Ending Balance 3,419 3,488 3,419 3,488  
Individually evaluated for impairment 117 148 117 148  
Collectively evaluated for impairment 3,302 3,340 3,302 3,340  
Financing receivables, Ending Balance 829,760 698,804 829,760 698,804  
Financing receivables, Individually evaluated for impairment, Ending Balance 423 148 423 148  
Financing receivables, Collectively evaluated for impairment, Ending Balance 829,337 698,656 829,337 698,656  
Consumer [Member] | Legacy Loans And Leases [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Individually evaluated for impairment 117   117    
Collectively evaluated for impairment 3,302   3,302    
Financing receivables, Individually evaluated for impairment, Ending Balance 306   306    
Financing receivables, Collectively evaluated for impairment, Ending Balance 816,898   816,898    
Consumer [Member] | Purchased Loans And Leases [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Individually evaluated for impairment 0   0    
Collectively evaluated for impairment 0   0    
Financing receivables, Individually evaluated for impairment, Ending Balance 117   117    
Financing receivables, Collectively evaluated for impairment, Ending Balance 12,439   12,439    
Leases [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for credit losses, Beginning Balance 12,857 10,091 10,561 8,643  
Charge-offs (955) (1,084) (2,946) (4,224)  
Recoveries 247 338 778 1,180  
Provision 674 774 4,430 4,520  
Allowance for credit losses, Ending Balance 12,823 10,119 12,823 10,119  
Individually evaluated for impairment 0 0 0 0  
Collectively evaluated for impairment 12,823 10,119 12,823 10,119  
Financing receivables, Ending Balance 777,646 678,746 777,646 678,746  
Financing receivables, Individually evaluated for impairment, Ending Balance 0 0 0 0  
Financing receivables, Collectively evaluated for impairment, Ending Balance 777,646 678,746 777,646 678,746  
Leases [Member] | Legacy Loans And Leases [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Individually evaluated for impairment 0   0    
Collectively evaluated for impairment 12,823   12,823    
Financing receivables, Individually evaluated for impairment, Ending Balance 0   0    
Financing receivables, Collectively evaluated for impairment, Ending Balance 777,646   777,646    
Leases [Member] | Purchased Loans And Leases [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Individually evaluated for impairment 0   0    
Collectively evaluated for impairment 0   0    
Financing receivables, Individually evaluated for impairment, Ending Balance 0   0    
Financing receivables, Collectively evaluated for impairment, Ending Balance 0   0    
Unallocated [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Allowance for credit losses, Beginning Balance 431 112 1,554 35  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision (261) (43) (1,384) 34  
Allowance for credit losses, Ending Balance 170 69 170 69  
Collectively evaluated for impairment 170 69 170 69  
Unallocated [Member] | Legacy Loans And Leases [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Collectively evaluated for impairment 170   170    
Unallocated [Member] | Purchased Loans And Leases [Member]
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Collectively evaluated for impairment $ 0   $ 0