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Loans and Leases and the Allowance for Credit Losses - Impaired Loans and Leases (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance $ 573,760 $ 499,152
Unpaid principal balance with related allowance 658,137 585,903
Related allowance 81,669 75,762
Recorded investment with no related allowance 218,384 261,157
Unpaid principal balance with no related allowance 273,186 314,587
Recorded investment 792,144 760,309
Unpaid principal balance 931,323 900,490
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 123,451 67,199
Unpaid principal balance with related allowance 135,167 75,084
Related allowance 11,851 9,140
Recorded investment with no related allowance 104,753 138,356
Unpaid principal balance with no related allowance 114,998 149,716
Recorded investment 228,204 205,555
Unpaid principal balance 250,165 224,800
Automobile [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 3,445 13,498
Unpaid principal balance with related allowance 4,118 15,737
Related allowance 705 2,811
Recorded investment 3,445 13,498
Unpaid principal balance 4,118 15,737
Commercial, Financial, Leasing, etc. [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 171,272 177,250
Unpaid principal balance with related allowance 193,161 194,257
Related allowance 46,554 45,488
Recorded investment with no related allowance 84,235 89,126
Unpaid principal balance with no related allowance 115,654 115,327
Recorded investment 255,507 266,376
Unpaid principal balance 308,815 309,584
Residential Builder and Developer [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 6,248 5,320
Unpaid principal balance with related allowance 6,782 5,641
Related allowance 352 308
Recorded investment with no related allowance 1,174 5,057
Unpaid principal balance with no related allowance 1,174 5,296
Recorded investment 7,422 10,377
Unpaid principal balance 7,956 10,937
Other Commercial Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 11,287 4,817
Unpaid principal balance with related allowance 11,650 20,357
Related allowance 878 647
Recorded investment with no related allowance 7,698 5,456
Unpaid principal balance with no related allowance 11,428 9,130
Recorded investment 18,985 10,273
Unpaid principal balance 23,078 29,487
Residential [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 122,627 101,724
Unpaid principal balance with related allowance 145,231 122,602
Related allowance 5,695 4,000
Recorded investment with no related allowance 14,651 13,574
Unpaid principal balance with no related allowance 19,742 18,980
Recorded investment 137,278 115,298
Unpaid principal balance 164,973 141,582
Residential Limited Documentation [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 75,183 77,277
Unpaid principal balance with related allowance 91,149 92,439
Related allowance 4,000 3,900
Recorded investment with no related allowance 5,873 9,588
Unpaid principal balance with no related allowance 10,190 16,138
Recorded investment 81,056 86,865
Unpaid principal balance 101,339 108,577
Home Equity Lines and Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 48,711 48,847
Unpaid principal balance with related allowance 53,869 53,914
Related allowance 9,269 8,812
Recorded investment 48,711 48,847
Unpaid principal balance 53,869 53,914
Other [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 11,536 3,220
Unpaid principal balance with related allowance 17,010 5,872
Related allowance 2,365 656
Recorded investment 11,536 3,220
Unpaid principal balance $ 17,010 $ 5,872