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Loans and Leases and the Allowance for Credit Losses - Impaired Loans and Leases (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance $ 489,560 $ 484,498
Unpaid principal balance with related allowance 566,193 558,385
Related allowance 96,758 83,054
Recorded investment with no related allowance 272,172 276,634
Unpaid principal balance with no related allowance 361,440 351,788
Recorded investment 761,732 761,132
Unpaid principal balance 927,633 910,173
Commercial Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 64,746 71,862
Unpaid principal balance with related allowance 80,482 86,666
Related allowance 10,541 11,620
Recorded investment with no related allowance 126,437 113,276
Unpaid principal balance with no related allowance 139,103 121,846
Recorded investment 191,183 185,138
Unpaid principal balance 219,585 208,512
Automobile [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 16,087 16,982
Unpaid principal balance with related allowance 16,602 18,272
Related allowance 3,508 3,740
Recorded investment 16,087 16,982
Unpaid principal balance 16,602 18,272
Commercial, Financial, Leasing, etc. [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 177,001 168,072
Unpaid principal balance with related allowance 196,338 184,432
Related allowance 64,056 48,480
Recorded investment with no related allowance 92,546 100,805
Unpaid principal balance with no related allowance 127,252 124,786
Recorded investment 269,547 268,877
Unpaid principal balance 323,590 309,218
Residential Builder and Developer [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 6,870 7,396
Unpaid principal balance with related allowance 7,031 8,361
Related allowance 403 506
Recorded investment with no related allowance 11,748 14,368
Unpaid principal balance with no related allowance 18,863 21,124
Recorded investment 18,618 21,764
Unpaid principal balance 25,894 29,485
Other Commercial Construction [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 2,203 2,475
Unpaid principal balance with related allowance 2,673 2,731
Related allowance 398 448
Recorded investment with no related allowance 12,029 15,933
Unpaid principal balance with no related allowance 31,072 35,281
Recorded investment 14,232 18,408
Unpaid principal balance 33,745 38,012
Residential [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 91,077 86,680
Unpaid principal balance with related allowance 111,477 105,944
Related allowance 3,738 3,457
Recorded investment with no related allowance 14,946 16,823
Unpaid principal balance with no related allowance 22,209 24,161
Recorded investment 106,023 103,503
Unpaid principal balance 133,686 130,105
Residential Limited Documentation [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 81,922 82,547
Unpaid principal balance with related allowance 97,658 97,718
Related allowance 5,000 6,000
Recorded investment with no related allowance 14,466 15,429
Unpaid principal balance with no related allowance 22,941 24,590
Recorded investment 96,388 97,976
Unpaid principal balance 120,599 122,308
Home Equity Lines and Loans [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 46,132 44,693
Unpaid principal balance with related allowance 50,262 48,965
Related allowance 8,389 8,027
Recorded investment 46,132 44,693
Unpaid principal balance 50,262 48,965
Other [Member]    
Financing Receivable Impaired [Line Items]    
Recorded investment with related allowance 3,522 3,791
Unpaid principal balance with related allowance 3,670 5,296
Related allowance 725 776
Recorded investment 3,522 3,791
Unpaid principal balance $ 3,670 $ 5,296