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Loans and Leases and the Allowance for Credit Losses - Impaired Loans and Leases (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance $ 513,647 $ 507,154
Unpaid principal balance with related allowance 579,473 567,962
Related allowance 90,796 90,093
Recorded investment with no related allowance 253,046 273,437
Unpaid principal balance with no related allowance 328,192 367,741
Recorded investment 766,693 780,591
Unpaid principal balance 907,665 935,703
Related allowance 90,796 90,093
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 79,748 85,974
Unpaid principal balance with related allowance 89,051 95,855
Related allowance 16,562 18,764
Recorded investment with no related allowance 101,949 101,340
Unpaid principal balance with no related allowance 118,540 116,230
Recorded investment 181,697 187,314
Unpaid principal balance 207,591 212,085
Related allowance 16,562 18,764
Automobile [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 19,137 22,525
Unpaid principal balance with related allowance 19,137 22,525
Related allowance 4,022 4,709
Recorded investment 19,137 22,525
Unpaid principal balance 19,137 22,525
Related allowance 4,022 4,709
Commercial, Financial, Leasing, etc. [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 196,990 179,037
Unpaid principal balance with related allowance 219,662 195,821
Related allowance 50,010 44,752
Recorded investment with no related allowance 74,409 93,190
Unpaid principal balance with no related allowance 83,632 110,735
Recorded investment 271,399 272,227
Unpaid principal balance 303,294 306,556
Related allowance 50,010 44,752
Residential Builder and Developer [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 6,854 3,316
Unpaid principal balance with related allowance 7,788 5,101
Related allowance 581 196
Recorded investment with no related allowance 21,619 27,651
Unpaid principal balance with no related allowance 30,837 47,246
Recorded investment 28,473 30,967
Unpaid principal balance 38,625 52,347
Related allowance 581 196
Other Commercial Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 3,312 3,548
Unpaid principal balance with related allowance 3,731 3,843
Related allowance 1,223 348
Recorded investment with no related allowance 18,334 13,221
Unpaid principal balance with no related allowance 37,278 31,477
Recorded investment 21,646 16,769
Unpaid principal balance 41,009 35,320
Related allowance 1,223 348
Residential [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 77,975 79,558
Unpaid principal balance with related allowance 96,157 96,751
Related allowance 3,337 4,727
Recorded investment with no related allowance 18,945 19,621
Unpaid principal balance with no related allowance 27,933 30,940
Recorded investment 96,920 99,179
Unpaid principal balance 124,090 127,691
Related allowance 3,337 4,727
Residential Limited Documentation [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 85,201 90,356
Unpaid principal balance with related allowance 98,607 104,251
Related allowance 6,700 8,000
Recorded investment with no related allowance 17,790 18,414
Unpaid principal balance with no related allowance 29,972 31,113
Recorded investment 102,991 108,770
Unpaid principal balance 128,579 135,364
Related allowance 6,700 8,000
Home Equity Lines and Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 40,004 25,220
Unpaid principal balance with related allowance 40,914 26,195
Related allowance 7,421 3,777
Recorded investment 40,004 25,220
Unpaid principal balance 40,914 26,195
Related allowance 7,421 3,777
Other [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 4,426 17,620
Unpaid principal balance with related allowance 4,426 17,620
Related allowance 940 4,820
Recorded investment 4,426 17,620
Unpaid principal balance 4,426 17,620
Related allowance $ 940 $ 4,820