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Allowance for Credit Losses - Impaired Loans and Leases (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance $ 499,152 $ 484,498
Unpaid principal balance with related allowance 585,903 558,385
Related allowance 75,762 83,054
Recorded investment with no related allowance 261,157 276,634
Unpaid principal balance with no related allowance 314,587 351,788
Recorded investment 760,309 761,132
Unpaid principal balance 900,490 910,173
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 67,199 71,862
Unpaid principal balance with related allowance 75,084 86,666
Related allowance 9,140 11,620
Recorded investment with no related allowance 138,356 113,276
Unpaid principal balance with no related allowance 149,716 121,846
Recorded investment 205,555 185,138
Unpaid principal balance 224,800 208,512
Automobile [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 13,498 16,982
Unpaid principal balance with related allowance 15,737 18,272
Related allowance 2,811 3,740
Recorded investment 13,498 16,982
Unpaid principal balance 15,737 18,272
Commercial, Financial, Leasing, etc. [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 177,250 168,072
Unpaid principal balance with related allowance 194,257 184,432
Related allowance 45,488 48,480
Recorded investment with no related allowance 89,126 100,805
Unpaid principal balance with no related allowance 115,327 124,786
Recorded investment 266,376 268,877
Unpaid principal balance 309,584 309,218
Residential Builder and Developer [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 5,320 7,396
Unpaid principal balance with related allowance 5,641 8,361
Related allowance 308 506
Recorded investment with no related allowance 5,057 14,368
Unpaid principal balance with no related allowance 5,296 21,124
Recorded investment 10,377 21,764
Unpaid principal balance 10,937 29,485
Other Commercial Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 4,817 2,475
Unpaid principal balance with related allowance 20,357 2,731
Related allowance 647 448
Recorded investment with no related allowance 5,456 15,933
Unpaid principal balance with no related allowance 9,130 35,281
Recorded investment 10,273 18,408
Unpaid principal balance 29,487 38,012
Residential [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 101,724 86,680
Unpaid principal balance with related allowance 122,602 105,944
Related allowance 4,000 3,457
Recorded investment with no related allowance 13,574 16,823
Unpaid principal balance with no related allowance 18,980 24,161
Recorded investment 115,298 103,503
Unpaid principal balance 141,582 130,105
Residential Limited Documentation [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 77,277 82,547
Unpaid principal balance with related allowance 92,439 97,718
Related allowance 3,900 6,000
Recorded investment with no related allowance 9,588 15,429
Unpaid principal balance with no related allowance 16,138 24,590
Recorded investment 86,865 97,976
Unpaid principal balance 108,577 122,308
Home Equity Lines and Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 48,847 44,693
Unpaid principal balance with related allowance 53,914 48,965
Related allowance 8,812 8,027
Recorded investment 48,847 44,693
Unpaid principal balance 53,914 48,965
Other [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 3,220 3,791
Unpaid principal balance with related allowance 5,872 5,296
Related allowance 656 776
Recorded investment 3,220 3,791
Unpaid principal balance $ 5,872 $ 5,296