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Loans and Leases and the Allowance for Credit Losses - Impaired Loans and Leases (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance $ 512,854 $ 499,152
Unpaid principal balance with related allowance 619,570 585,903
Related allowance 76,409 75,762
Recorded investment with no related allowance 242,407 261,157
Unpaid principal balance with no related allowance 295,400 314,587
Recorded investment 755,261 760,309
Unpaid principal balance 914,970 900,490
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 77,118 67,199
Unpaid principal balance with related allowance 88,313 75,084
Related allowance 9,981 9,140
Recorded investment with no related allowance 96,267 138,356
Unpaid principal balance with no related allowance 104,911 149,716
Recorded investment 173,385 205,555
Unpaid principal balance 193,224 224,800
Automobile [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 12,797 13,498
Unpaid principal balance with related allowance 15,461 15,737
Related allowance 2,694 2,811
Recorded investment 12,797 13,498
Unpaid principal balance 15,461 15,737
Commercial, Financial, Leasing, etc. [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 172,385 177,250
Unpaid principal balance with related allowance 203,464 194,257
Related allowance 45,501 45,488
Recorded investment with no related allowance 115,336 89,126
Unpaid principal balance with no related allowance 145,450 115,327
Recorded investment 287,721 266,376
Unpaid principal balance 348,914 309,584
Residential Builder and Developer [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 5,536 5,320
Unpaid principal balance with related allowance 5,828 5,641
Related allowance 187 308
Recorded investment with no related allowance 3,760 5,057
Unpaid principal balance with no related allowance 3,832 5,296
Recorded investment 9,296 10,377
Unpaid principal balance 9,660 10,937
Other Commercial Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 3,893 4,817
Unpaid principal balance with related allowance 19,598 20,357
Related allowance 456 647
Recorded investment with no related allowance 5,425 5,456
Unpaid principal balance with no related allowance 9,142 9,130
Recorded investment 9,318 10,273
Unpaid principal balance 28,740 29,487
Residential [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 112,068 101,724
Unpaid principal balance with related allowance 134,431 122,602
Related allowance 4,048 4,000
Recorded investment with no related allowance 13,868 13,574
Unpaid principal balance with no related allowance 19,105 18,980
Recorded investment 125,936 115,298
Unpaid principal balance 153,536 141,582
Residential Limited Documentation [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 76,984 77,277
Unpaid principal balance with related allowance 92,586 92,439
Related allowance 4,000 3,900
Recorded investment with no related allowance 7,751 9,588
Unpaid principal balance with no related allowance 12,960 16,138
Recorded investment 84,735 86,865
Unpaid principal balance 105,546 108,577
Home Equity Lines and Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 48,991 48,847
Unpaid principal balance with related allowance 54,032 53,914
Related allowance 8,913 8,812
Recorded investment 48,991 48,847
Unpaid principal balance 54,032 53,914
Other [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 3,082 3,220
Unpaid principal balance with related allowance 5,857 5,872
Related allowance 629 656
Recorded investment 3,082 3,220
Unpaid principal balance $ 5,857 $ 5,872