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Allowance for Credit Losses - Impaired Loans and Leases (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance $ 507,154 $ 498,575
Unpaid principal balance with related allowance 567,962 581,887
Related allowance 90,093 82,643
Recorded investment with no related allowance 273,437 263,880
Unpaid principal balance with no related allowance 367,741 371,907
Recorded investment 780,591 762,455
Unpaid principal balance 935,703 953,794
Related allowance 90,093 82,643
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 85,974 83,955
Unpaid principal balance with related allowance 95,855 96,209
Related allowance 18,764 14,121
Recorded investment with no related allowance 101,340 66,777
Unpaid principal balance with no related allowance 116,230 78,943
Recorded investment 187,314 150,732
Unpaid principal balance 212,085 175,152
Related allowance 18,764 14,121
Automobile [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 22,525 30,317
Unpaid principal balance with related allowance 22,525 30,317
Related allowance 4,709 8,070
Recorded investment 22,525 30,317
Unpaid principal balance 22,525 30,317
Related allowance 4,709 8,070
Commercial, Financial, Leasing, etc. [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 179,037 132,340
Unpaid principal balance with related allowance 195,821 165,146
Related allowance 44,752 31,779
Recorded investment with no related allowance 93,190 73,978
Unpaid principal balance with no related allowance 110,735 81,493
Recorded investment 272,227 206,318
Unpaid principal balance 306,556 246,639
Related allowance 44,752 31,779
Residential Builder and Developer [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 3,316 17,632
Unpaid principal balance with related allowance 5,101 22,044
Related allowance 196 805
Recorded investment with no related allowance 27,651 58,820
Unpaid principal balance with no related allowance 47,246 96,722
Recorded investment 30,967 76,452
Unpaid principal balance 52,347 118,766
Related allowance 196 805
Other Commercial Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 3,548 5,480
Unpaid principal balance with related allowance 3,843 6,484
Related allowance 348 900
Recorded investment with no related allowance 13,221 20,738
Unpaid principal balance with no related allowance 31,477 41,035
Recorded investment 16,769 26,218
Unpaid principal balance 35,320 47,519
Related allowance 348 900
Residential [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 79,558 88,970
Unpaid principal balance with related allowance 96,751 107,343
Related allowance 4,727 4,296
Recorded investment with no related allowance 19,621 16,815
Unpaid principal balance with no related allowance 30,940 26,750
Recorded investment 99,179 105,785
Unpaid principal balance 127,691 134,093
Related allowance 4,727 4,296
Residential Limited Documentation [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 90,356 101,137
Unpaid principal balance with related allowance 104,251 114,565
Related allowance 8,000 11,000
Recorded investment with no related allowance 18,414 26,752
Unpaid principal balance with no related allowance 31,113 46,964
Recorded investment 108,770 127,889
Unpaid principal balance 135,364 161,529
Related allowance 8,000 11,000
Home Equity Lines and Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 25,220 19,771
Unpaid principal balance with related allowance 26,195 20,806
Related allowance 3,777 6,213
Recorded investment 25,220 19,771
Unpaid principal balance 26,195 20,806
Related allowance 3,777 6,213
Other [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 17,620 18,973
Unpaid principal balance with related allowance 17,620 18,973
Related allowance 4,820 5,459
Recorded investment 17,620 18,973
Unpaid principal balance 17,620 18,973
Related allowance $ 4,820 $ 5,459