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Loans and Leases and the Allowance for Credit Losses - Impaired Loans and Leases (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance $ 532,416 $ 507,154
Unpaid principal balance with related allowance 597,380 567,962
Related allowance 104,513 90,093
Recorded investment with no related allowance 280,760 273,437
Unpaid principal balance with no related allowance 377,395 367,741
Recorded investment 813,176 780,591
Unpaid principal balance 974,775 935,703
Related allowance 104,513 90,093
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 86,612 85,974
Unpaid principal balance with related allowance 97,912 95,855
Related allowance 19,600 18,764
Recorded investment with no related allowance 92,733 101,340
Unpaid principal balance with no related allowance 106,710 116,230
Recorded investment 179,345 187,314
Unpaid principal balance 204,622 212,085
Related allowance 19,600 18,764
Automobile [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 21,289 22,525
Unpaid principal balance with related allowance 21,289 22,525
Related allowance 4,867 4,709
Recorded investment 21,289 22,525
Unpaid principal balance 21,289 22,525
Related allowance 4,867 4,709
Commercial, Financial, Leasing, etc. [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 204,786 179,037
Unpaid principal balance with related allowance 223,269 195,821
Related allowance 58,714 44,752
Recorded investment with no related allowance 105,342 93,190
Unpaid principal balance with no related allowance 126,130 110,735
Recorded investment 310,128 272,227
Unpaid principal balance 349,399 306,556
Related allowance 58,714 44,752
Residential Builder and Developer [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 6,581 3,316
Unpaid principal balance with related allowance 8,296 5,101
Related allowance 839 196
Recorded investment with no related allowance 28,938 27,651
Unpaid principal balance with no related allowance 49,177 47,246
Recorded investment 35,519 30,967
Unpaid principal balance 57,473 52,347
Related allowance 839 196
Other Commercial Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 2,358 3,548
Unpaid principal balance with related allowance 2,678 3,843
Related allowance 397 348
Recorded investment with no related allowance 18,811 13,221
Unpaid principal balance with no related allowance 37,498 31,477
Recorded investment 21,169 16,769
Unpaid principal balance 40,176 35,320
Related allowance 397 348
Residential [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 77,579 79,558
Unpaid principal balance with related allowance 95,679 96,751
Related allowance 4,348 4,727
Recorded investment with no related allowance 17,574 19,621
Unpaid principal balance with no related allowance 28,336 30,940
Recorded investment 95,153 99,179
Unpaid principal balance 124,015 127,691
Related allowance 4,348 4,727
Residential Limited Documentation [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 87,791 90,356
Unpaid principal balance with related allowance 101,841 104,251
Related allowance 7,000 8,000
Recorded investment with no related allowance 17,362 18,414
Unpaid principal balance with no related allowance 29,544 31,113
Recorded investment 105,153 108,770
Unpaid principal balance 131,385 135,364
Related allowance 7,000 8,000
Home Equity Lines and Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 27,544 25,220
Unpaid principal balance with related allowance 28,540 26,195
Related allowance 3,904 3,777
Recorded investment 27,544 25,220
Unpaid principal balance 28,540 26,195
Related allowance 3,904 3,777
Other [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 17,876 17,620
Unpaid principal balance with related allowance 17,876 17,620
Related allowance 4,844 4,820
Recorded investment 17,876 17,620
Unpaid principal balance 17,876 17,620
Related allowance $ 4,844 $ 4,820