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Loans and Leases and the Allowance for Credit Losses - Impaired Loans and Leases (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance $ 507,795 $ 499,152
Unpaid principal balance with related allowance 607,159 585,903
Related allowance 67,495 75,762
Recorded investment with no related allowance 231,498 261,157
Unpaid principal balance with no related allowance 282,712 314,587
Recorded investment 739,293 760,309
Unpaid principal balance 889,871 900,490
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 85,588 67,199
Unpaid principal balance with related allowance 96,221 75,084
Related allowance 9,316 9,140
Recorded investment with no related allowance 89,024 138,356
Unpaid principal balance with no related allowance 99,658 149,716
Recorded investment 174,612 205,555
Unpaid principal balance 195,879 224,800
Automobile [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 12,467 13,498
Unpaid principal balance with related allowance 15,396 15,737
Related allowance 2,595 2,811
Recorded investment 12,467 13,498
Unpaid principal balance 15,396 15,737
Commercial, Financial, Leasing, etc. [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 157,228 177,250
Unpaid principal balance with related allowance 180,016 194,257
Related allowance 37,589 45,488
Recorded investment with no related allowance 112,604 89,126
Unpaid principal balance with no related allowance 139,843 115,327
Recorded investment 269,832 266,376
Unpaid principal balance 319,859 309,584
Residential Builder and Developer [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 6,085 5,320
Unpaid principal balance with related allowance 6,465 5,641
Related allowance 211 308
Recorded investment with no related allowance 4,353 5,057
Unpaid principal balance with no related allowance 4,471 5,296
Recorded investment 10,438 10,377
Unpaid principal balance 10,936 10,937
Other Commercial Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 1,829 4,817
Unpaid principal balance with related allowance 17,670 20,357
Related allowance 345 647
Recorded investment with no related allowance 6,021 5,456
Unpaid principal balance with no related allowance 9,726 9,130
Recorded investment 7,850 10,273
Unpaid principal balance 27,396 29,487
Residential [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 117,111 101,724
Unpaid principal balance with related allowance 139,966 122,602
Related allowance 4,068 4,000
Recorded investment with no related allowance 12,665 13,574
Unpaid principal balance with no related allowance 17,161 18,980
Recorded investment 129,776 115,298
Unpaid principal balance 157,127 141,582
Residential Limited Documentation [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 76,040 77,277
Unpaid principal balance with related allowance 91,851 92,439
Related allowance 4,000 3,900
Recorded investment with no related allowance 6,831 9,588
Unpaid principal balance with no related allowance 11,853 16,138
Recorded investment 82,871 86,865
Unpaid principal balance 103,704 108,577
Home Equity Lines and Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 48,436 48,847
Unpaid principal balance with related allowance 53,538 53,914
Related allowance 8,757 8,812
Recorded investment 48,436 48,847
Unpaid principal balance 53,538 53,914
Other [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 3,011 3,220
Unpaid principal balance with related allowance 6,036 5,872
Related allowance 614 656
Recorded investment 3,011 3,220
Unpaid principal balance $ 6,036 $ 5,872