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Loans and Leases and the Allowance for Credit Losses - Impaired Loans and Leases (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance $ 506,774 $ 507,154
Unpaid principal balance with related allowance 575,795 567,962
Related allowance 93,418 90,093
Recorded investment with no related allowance 234,155 273,437
Unpaid principal balance with no related allowance 300,377 367,741
Recorded investment 740,929 780,591
Unpaid principal balance 876,172 935,703
Related allowance 93,418 90,093
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 75,749 85,974
Unpaid principal balance with related allowance 85,137 95,855
Related allowance 14,939 18,764
Recorded investment with no related allowance 90,425 101,340
Unpaid principal balance with no related allowance 104,508 116,230
Recorded investment 166,174 187,314
Unpaid principal balance 189,645 212,085
Related allowance 14,939 18,764
Automobile [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 18,033 22,525
Unpaid principal balance with related allowance 19,218 22,525
Related allowance 3,737 4,709
Recorded investment 18,033 22,525
Unpaid principal balance 19,218 22,525
Related allowance 3,737 4,709
Commercial, Financial, Leasing, etc. [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 192,805 179,037
Unpaid principal balance with related allowance 212,009 195,821
Related allowance 55,020 44,752
Recorded investment with no related allowance 72,429 93,190
Unpaid principal balance with no related allowance 80,757 110,735
Recorded investment 265,234 272,227
Unpaid principal balance 292,766 306,556
Related allowance 55,020 44,752
Residential Builder and Developer [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 8,142 3,316
Unpaid principal balance with related allowance 8,923 5,101
Related allowance 714 196
Recorded investment with no related allowance 17,346 27,651
Unpaid principal balance with no related allowance 23,617 47,246
Recorded investment 25,488 30,967
Unpaid principal balance 32,540 52,347
Related allowance 714 196
Other Commercial Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 2,729 3,548
Unpaid principal balance with related allowance 3,092 3,843
Related allowance 1,103 348
Recorded investment with no related allowance 18,265 13,221
Unpaid principal balance with no related allowance 37,432 31,477
Recorded investment 20,994 16,769
Unpaid principal balance 40,524 35,320
Related allowance 1,103 348
Residential [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 79,036 79,558
Unpaid principal balance with related allowance 97,466 96,751
Related allowance 3,144 4,727
Recorded investment with no related allowance 18,079 19,621
Unpaid principal balance with no related allowance 26,127 30,940
Recorded investment 97,115 99,179
Unpaid principal balance 123,593 127,691
Related allowance 3,144 4,727
Residential Limited Documentation [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 83,296 90,356
Unpaid principal balance with related allowance 97,984 104,251
Related allowance 6,200 8,000
Recorded investment with no related allowance 17,611 18,414
Unpaid principal balance with no related allowance 27,936 31,113
Recorded investment 100,907 108,770
Unpaid principal balance 125,920 135,364
Related allowance 6,200 8,000
Home Equity Lines and Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 42,862 25,220
Unpaid principal balance with related allowance 46,844 26,195
Related allowance 7,697 3,777
Recorded investment 42,862 25,220
Unpaid principal balance 46,844 26,195
Related allowance 7,697 3,777
Other [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 4,122 17,620
Unpaid principal balance with related allowance 5,122 17,620
Related allowance 864 4,820
Recorded investment 4,122 17,620
Unpaid principal balance 5,122 17,620
Related allowance $ 864 $ 4,820