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Allowance for Credit Losses - Impaired Loans and Leases (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance $ 484,498 $ 507,154
Unpaid principal balance with related allowance 558,385 567,962
Related allowance 83,054 90,093
Recorded investment with no related allowance 276,634 273,437
Unpaid principal balance with no related allowance 351,788 367,741
Recorded investment 761,132 780,591
Unpaid principal balance 910,173 935,703
Commercial Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 71,862 85,974
Unpaid principal balance with related allowance 86,666 95,855
Related allowance 11,620 18,764
Recorded investment with no related allowance 113,276 101,340
Unpaid principal balance with no related allowance 121,846 116,230
Recorded investment 185,138 187,314
Unpaid principal balance 208,512 212,085
Automobile [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 16,982 22,525
Unpaid principal balance with related allowance 18,272 22,525
Related allowance 3,740 4,709
Recorded investment 16,982 22,525
Unpaid principal balance 18,272 22,525
Commercial, Financial, Leasing, etc. [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 168,072 179,037
Unpaid principal balance with related allowance 184,432 195,821
Related allowance 48,480 44,752
Recorded investment with no related allowance 100,805 93,190
Unpaid principal balance with no related allowance 124,786 110,735
Recorded investment 268,877 272,227
Unpaid principal balance 309,218 306,556
Residential Builder and Developer [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 7,396 3,316
Unpaid principal balance with related allowance 8,361 5,101
Related allowance 506 196
Recorded investment with no related allowance 14,368 27,651
Unpaid principal balance with no related allowance 21,124 47,246
Recorded investment 21,764 30,967
Unpaid principal balance 29,485 52,347
Other Commercial Construction [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 2,475 3,548
Unpaid principal balance with related allowance 2,731 3,843
Related allowance 448 348
Recorded investment with no related allowance 15,933 13,221
Unpaid principal balance with no related allowance 35,281 31,477
Recorded investment 18,408 16,769
Unpaid principal balance 38,012 35,320
Residential [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 86,680 79,558
Unpaid principal balance with related allowance 105,944 96,751
Related allowance 3,457 4,727
Recorded investment with no related allowance 16,823 19,621
Unpaid principal balance with no related allowance 24,161 30,940
Recorded investment 103,503 99,179
Unpaid principal balance 130,105 127,691
Residential Limited Documentation [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 82,547 90,356
Unpaid principal balance with related allowance 97,718 104,251
Related allowance 6,000 8,000
Recorded investment with no related allowance 15,429 18,414
Unpaid principal balance with no related allowance 24,590 31,113
Recorded investment 97,976 108,770
Unpaid principal balance 122,308 135,364
Home Equity Lines and Loans [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 44,693 25,220
Unpaid principal balance with related allowance 48,965 26,195
Related allowance 8,027 3,777
Recorded investment 44,693 25,220
Unpaid principal balance 48,965 26,195
Other [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 3,791 17,620
Unpaid principal balance with related allowance 5,296 17,620
Related allowance 776 4,820
Recorded investment 3,791 17,620
Unpaid principal balance $ 5,296 $ 17,620