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Loans and Leases and the Allowance for Credit Losses - Impaired Loans and Leases (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance $ 581,303 $ 542,255
Unpaid principal balance with related allowance 678,185 630,609
Related allowance 90,992 79,646
Recorded investment with no related allowance 349,499 254,196
Unpaid principal balance with no related allowance 389,977 305,559
Recorded investment 930,802 796,451
Unpaid principal balance 1,068,162 936,168
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 60,489 110,253
Unpaid principal balance with related allowance 67,104 125,117
Related allowance 7,711 11,937
Recorded investment with no related allowance 144,554 113,376
Unpaid principal balance with no related allowance 163,120 124,657
Recorded investment 205,043 223,629
Unpaid principal balance 230,224 249,774
Automobile [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 3,478 3,527
Unpaid principal balance with related allowance 3,526 3,599
Related allowance 708 729
Recorded investment 3,478 3,527
Unpaid principal balance 3,526 3,599
Commercial, Financial, Leasing, etc. [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 245,355 153,478
Unpaid principal balance with related allowance 273,931 175,549
Related allowance 60,410 46,034
Recorded investment with no related allowance 159,991 105,507
Unpaid principal balance with no related allowance 172,191 136,128
Recorded investment 405,346 258,985
Unpaid principal balance 446,122 311,677
Residential Builder and Developer [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 8,893 5,981
Unpaid principal balance with related allowance 9,311 6,557
Related allowance 319 462
Recorded investment with no related allowance 3,378 2,593
Unpaid principal balance with no related allowance 3,378 2,602
Recorded investment 12,271 8,574
Unpaid principal balance 12,689 9,159
Other Commercial Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 12,821 10,563
Unpaid principal balance with related allowance 25,437 11,113
Related allowance 1,477 640
Recorded investment with no related allowance 18,620 11,710
Unpaid principal balance with no related allowance 19,614 11,880
Recorded investment 31,441 22,273
Unpaid principal balance 45,051 22,993
Residential [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 125,498 124,974
Unpaid principal balance with related allowance 146,098 147,817
Related allowance 6,748 5,402
Recorded investment with no related allowance 18,949 15,379
Unpaid principal balance with no related allowance 24,350 20,496
Recorded investment 144,447 140,353
Unpaid principal balance 170,448 168,313
Residential Limited Documentation [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 67,729 74,156
Unpaid principal balance with related allowance 81,918 90,066
Related allowance 2,600 3,000
Recorded investment with no related allowance 4,007 5,631
Unpaid principal balance with no related allowance 7,324 9,796
Recorded investment 71,736 79,787
Unpaid principal balance 89,242 99,862
Home Equity Lines and Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 46,858 47,982
Unpaid principal balance with related allowance 51,759 53,248
Related allowance 8,923 9,135
Recorded investment 46,858 47,982
Unpaid principal balance 51,759 53,248
Recreational Finance [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 5,483 6,138
Unpaid principal balance with related allowance 9,481 9,163
Related allowance 1,153 1,261
Recorded investment 5,483 6,138
Unpaid principal balance 9,481 9,163
Other [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded investment with related allowance 4,699 5,203
Unpaid principal balance with related allowance 9,620 8,380
Related allowance 943 1,046
Recorded investment 4,699 5,203
Unpaid principal balance $ 9,620 $ 8,380