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Loans and Leases and the Allowance for Credit Losses - Impaired Loans and Leases (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance $ 506,873 $ 484,498
Unpaid principal balance with related allowance 592,553 558,385
Related allowance 83,038 83,054
Recorded investment with no related allowance 239,690 276,634
Unpaid principal balance with no related allowance 309,408 351,788
Recorded investment 746,563 761,132
Unpaid principal balance 901,961 910,173
Commercial Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 91,624 71,862
Unpaid principal balance with related allowance 107,191 86,666
Related allowance 11,047 11,620
Recorded investment with no related allowance 132,061 113,276
Unpaid principal balance with no related allowance 141,025 121,846
Recorded investment 223,685 185,138
Unpaid principal balance 248,216 208,512
Automobile [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 14,919 16,982
Unpaid principal balance with related allowance 17,153 18,272
Related allowance 3,149 3,740
Recorded investment 14,919 16,982
Unpaid principal balance 17,153 18,272
Commercial, Financial, Leasing, etc. [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 162,881 168,072
Unpaid principal balance with related allowance 186,158 184,432
Related allowance 50,377 48,480
Recorded investment with no related allowance 63,884 100,805
Unpaid principal balance with no related allowance 85,046 124,786
Recorded investment 226,765 268,877
Unpaid principal balance 271,204 309,218
Residential Builder and Developer [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 5,656 7,396
Unpaid principal balance with related allowance 5,834 8,361
Related allowance 350 506
Recorded investment with no related allowance 5,791 14,368
Unpaid principal balance with no related allowance 13,227 21,124
Recorded investment 11,447 21,764
Unpaid principal balance 19,061 29,485
Other Commercial Construction [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 1,825 2,475
Unpaid principal balance with related allowance 2,102 2,731
Related allowance 327 448
Recorded investment with no related allowance 14,382 15,933
Unpaid principal balance with no related allowance 33,641 35,281
Recorded investment 16,207 18,408
Unpaid principal balance 35,743 38,012
Residential [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 96,638 86,680
Unpaid principal balance with related allowance 117,969 105,944
Related allowance 3,610 3,457
Recorded investment with no related allowance 12,672 16,823
Unpaid principal balance with no related allowance 18,156 24,161
Recorded investment 109,310 103,503
Unpaid principal balance 136,125 130,105
Residential Limited Documentation [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 82,086 82,547
Unpaid principal balance with related allowance 97,879 97,718
Related allowance 4,700 6,000
Recorded investment with no related allowance 10,900 15,429
Unpaid principal balance with no related allowance 18,313 24,590
Recorded investment 92,986 97,976
Unpaid principal balance 116,192 122,308
Home Equity Lines and Loans [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 47,890 44,693
Unpaid principal balance with related allowance 52,611 48,965
Related allowance 8,791 8,027
Recorded investment 47,890 44,693
Unpaid principal balance 52,611 48,965
Other [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 3,354 3,791
Unpaid principal balance with related allowance 5,656 5,296
Related allowance 687 776
Recorded investment 3,354 3,791
Unpaid principal balance $ 5,656 $ 5,296