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Loans and Leases and the Allowance for Credit Losses - Impaired Loans and Leases (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule Of Financial Receivables [Line Items]    
Recorded investment $ 902,980 $ 889,226
Unpaid principal balance 1,091,524 1,083,258
Related allowance 86,455 92,608
Commercial, Financial, Leasing, etc. [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 145,420 118,386
Unpaid principal balance 173,080 145,187
Related allowance 21,578 24,614
Commercial Real Estate [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 186,092 178,841
Unpaid principal balance 224,524 216,658
Related allowance 15,811 19,520
Residential Builder and Developer [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 99,801 105,677
Unpaid principal balance 146,979 159,890
Related allowance 4,746 4,379
Other commercial construction [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 82,855 93,629
Unpaid principal balance 90,696 102,008
Related allowance 5,933 4,022
Residential [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 177,357 180,652
Unpaid principal balance 206,433 209,879
Related allowance 5,262 7,146
Residential Alt-A [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 138,033 140,268
Unpaid principal balance 175,320 176,739
Related allowance 13,000 14,000
Home equity lines and loans [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 17,522 13,672
Unpaid principal balance 18,592 14,796
Related allowance 5,225 3,312
Automobile [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 38,068 40,441
Unpaid principal balance 38,068 40,441
Related allowance 10,120 11,074
Other [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 17,832 17,660
Unpaid principal balance 17,832 17,660
Related allowance 4,780 4,541
Impaired Financing Receivable With Related Allowance [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 592,581 603,626
Unpaid principal balance 688,054 702,000
Related allowance 86,455 92,608
Impaired Financing Receivable With Related Allowance [Member] | Commercial, Financial, Leasing, etc. [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 104,878 90,293
Unpaid principal balance 130,132 112,092
Related allowance 21,578 24,614
Impaired Financing Receivable With Related Allowance [Member] | Commercial Real Estate [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 102,898 113,570
Unpaid principal balance 120,165 132,325
Related allowance 15,811 19,520
Impaired Financing Receivable With Related Allowance [Member] | Residential Builder and Developer [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 31,314 33,311
Unpaid principal balance 45,625 55,122
Related allowance 4,746 4,379
Impaired Financing Receivable With Related Allowance [Member] | Other commercial construction [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 77,054 86,260
Unpaid principal balance 81,296 90,515
Related allowance 5,933 4,022
Impaired Financing Receivable With Related Allowance [Member] | Residential [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 93,029 96,508
Unpaid principal balance 112,025 114,521
Related allowance 5,262 7,146
Impaired Financing Receivable With Related Allowance [Member] | Residential Alt-A [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 109,986 111,911
Unpaid principal balance 124,319 124,528
Related allowance 13,000 14,000
Impaired Financing Receivable With Related Allowance [Member] | Home equity lines and loans [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 17,522 13,672
Unpaid principal balance 18,592 14,796
Related allowance 5,225 3,312
Impaired Financing Receivable With Related Allowance [Member] | Automobile [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 38,068 40,441
Unpaid principal balance 38,068 40,441
Related allowance 10,120 11,074
Impaired Financing Receivable With Related Allowance [Member] | Other [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 17,832 17,660
Unpaid principal balance 17,832 17,660
Related allowance 4,780 4,541
Impaired Financing Receivable with No Related Allowance [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 310,399 285,600
Unpaid principal balance 403,470 381,258
Impaired Financing Receivable with No Related Allowance [Member] | Commercial, Financial, Leasing, etc. [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 40,542 28,093
Unpaid principal balance 42,948 33,095
Impaired Financing Receivable with No Related Allowance [Member] | Commercial Real Estate [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 83,194 65,271
Unpaid principal balance 104,359 84,333
Impaired Financing Receivable with No Related Allowance [Member] | Residential Builder and Developer [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 68,487 72,366
Unpaid principal balance 101,354 104,768
Impaired Financing Receivable with No Related Allowance [Member] | Other commercial construction [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 5,801 7,369
Unpaid principal balance 9,400 11,493
Impaired Financing Receivable with No Related Allowance [Member] | Residential [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 84,328 84,144
Unpaid principal balance 94,408 95,358
Impaired Financing Receivable with No Related Allowance [Member] | Residential Alt-A [Member]
   
Schedule Of Financial Receivables [Line Items]    
Recorded investment 28,047 28,357
Unpaid principal balance $ 51,001 $ 52,211