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Loans and Leases and the Allowance for Credit Losses - Loan Modification Activities that were Considered Troubled Debt Restructurings (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Modification
Jun. 30, 2012
Modification
Jun. 30, 2013
Modification
Jun. 30, 2012
Modification
Financing Receivable, Modifications [Line Items]        
Number of modifications 341 384 673 829
Pre-modification, Recorded investment $ 135,325 $ 89,684 $ 215,006 $ 116,312
Post-modification, Recorded investment 130,897 88,494 210,557 115,155
Financial effects of modification, Recorded investment (4,428) (1,190) (4,449) (1,157)
Financial effects of modification, Interest (1,404) (710) (2,288) (1,193)
Principal Deferral [Member] | Commercial, Financial, Leasing, etc. [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 15 9 39 18
Pre-modification, Recorded investment 4,870 10,392 6,876 13,204
Post-modification, Recorded investment 4,822 9,061 6,804 12,015
Financial effects of modification, Recorded investment (48) (1,331) (72) (1,189)
Financial effects of modification, Interest            
Principal Deferral [Member] | Commercial Real Estate [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 5 1 13 3
Pre-modification, Recorded investment 15,549 2,011 34,027 4,436
Post-modification, Recorded investment 15,530 1,999 33,893 4,404
Financial effects of modification, Recorded investment (19) (12) (134) (32)
Financial effects of modification, Interest            
Principal Deferral [Member] | Residential Builder and Developer [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 7 3 15 8
Pre-modification, Recorded investment 17,496 2,503 18,853 9,325
Post-modification, Recorded investment 16,722 2,503 18,062 8,537
Financial effects of modification, Recorded investment (774)    (791) (788)
Financial effects of modification, Interest            
Principal Deferral [Member] | Other Commercial Construction [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 2 3 2 3
Pre-modification, Recorded investment 364 60,888 364 60,888
Post-modification, Recorded investment 363 60,898 363 60,898
Financial effects of modification, Recorded investment (1) 10 (1) 10
Financial effects of modification, Interest            
Principal Deferral [Member] | Residential [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 8 7 15 22
Pre-modification, Recorded investment 1,216 1,059 1,782 2,564
Post-modification, Recorded investment 1,358 1,087 1,965 2,675
Financial effects of modification, Recorded investment 142 28 183 111
Financial effects of modification, Interest            
Principal Deferral [Member] | Residential Alt-A [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 1 1 1 4
Pre-modification, Recorded investment 99 153 99 550
Post-modification, Recorded investment 102 158 102 565
Financial effects of modification, Recorded investment 3 5 3 15
Financial effects of modification, Interest            
Principal Deferral [Member] | Home Equity Lines and Loans [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 2 9 4 10
Pre-modification, Recorded investment 101 734 180 851
Post-modification, Recorded investment 103 734 182 851
Financial effects of modification, Recorded investment 2    2   
Financial effects of modification, Interest            
Principal Deferral [Member] | Automobile [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 117 196 238 349
Pre-modification, Recorded investment 1,629 2,700 3,215 4,585
Post-modification, Recorded investment 1,629 2,700 3,215 4,585
Financial effects of modification, Recorded investment            
Financial effects of modification, Interest            
Principal Deferral [Member] | Other [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 14 7 20 59
Pre-modification, Recorded investment 185 134 230 781
Post-modification, Recorded investment 185 134 230 781
Financial effects of modification, Recorded investment            
Financial effects of modification, Interest            
Other [Member] | Commercial, Financial, Leasing, etc. [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 1 2 2 3
Pre-modification, Recorded investment 1,460 1,995 48,660 2,967
Post-modification, Recorded investment 1,657 1,954 48,857 3,052
Financial effects of modification, Recorded investment 197 (41) 197 85
Financial effects of modification, Interest            
Other [Member] | Residential Builder and Developer [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 1   1  
Pre-modification, Recorded investment 4,039   4,039  
Post-modification, Recorded investment 3,888   3,888  
Financial effects of modification, Recorded investment (151)   (151)  
Financial effects of modification, Interest          
Other [Member] | Residential [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications     1  
Pre-modification, Recorded investment     195  
Post-modification, Recorded investment     195  
Financial effects of modification, Recorded investment         
Financial effects of modification, Interest         
Other [Member] | Home Equity Lines and Loans [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 1   1  
Pre-modification, Recorded investment 106   106  
Post-modification, Recorded investment 106   106  
Financial effects of modification, Recorded investment          
Financial effects of modification, Interest          
Other [Member] | Automobile [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 28 21 45 31
Pre-modification, Recorded investment 73 152 232 171
Post-modification, Recorded investment 73 152 232 171
Financial effects of modification, Recorded investment            
Financial effects of modification, Interest            
Other [Member] | Other [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications     1 9
Pre-modification, Recorded investment     12 49
Post-modification, Recorded investment     12 49
Financial effects of modification, Recorded investment          
Financial effects of modification, Interest          
Interest Rate Reduction [Member] | Commercial Real Estate [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications   1   1
Pre-modification, Recorded investment   383   383
Post-modification, Recorded investment   430   430
Financial effects of modification, Recorded investment   47   47
Financial effects of modification, Interest   (89)   (89)
Interest Rate Reduction [Member] | Home Equity Lines and Loans [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 1   1 1
Pre-modification, Recorded investment 99   99 144
Post-modification, Recorded investment 99   99 144
Financial effects of modification, Recorded investment           
Financial effects of modification, Interest (8)   (8) (6)
Interest Rate Reduction [Member] | Automobile [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 7 3 9 7
Pre-modification, Recorded investment 104 20 140 77
Post-modification, Recorded investment 104 20 140 77
Financial effects of modification, Recorded investment            
Financial effects of modification, Interest (10) (1) (15) (5)
Interest Rate Reduction [Member] | Other [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 1   1 3
Pre-modification, Recorded investment 12   12 23
Post-modification, Recorded investment 12   12 23
Financial effects of modification, Recorded investment           
Financial effects of modification, Interest (2)   (2) (3)
Combination of Concession Types [Member] | Commercial, Financial, Leasing, etc. [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 2   3 1
Pre-modification, Recorded investment 1,490   1,832 45
Post-modification, Recorded investment 980   1,322 44
Financial effects of modification, Recorded investment (510)   (510) (1)
Financial effects of modification, Interest         (33)
Combination of Concession Types [Member] | Commercial Real Estate [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications   4 2 4
Pre-modification, Recorded investment   1,210 582 1,210
Post-modification, Recorded investment   1,231 581 1,231
Financial effects of modification, Recorded investment   21 (1) 21
Financial effects of modification, Interest   (256) (56) (256)
Combination of Concession Types [Member] | Residential Builder and Developer [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 2   3 2
Pre-modification, Recorded investment 13,879   15,580 2,350
Post-modification, Recorded investment 13,823   15,514 2,726
Financial effects of modification, Recorded investment (56)   (66) 376
Financial effects of modification, Interest (535)   (535)   
Combination of Concession Types [Member] | Residential [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 18 11 38 29
Pre-modification, Recorded investment 69,210 2,049 71,659 4,985
Post-modification, Recorded investment 65,890 2,098 68,426 5,105
Financial effects of modification, Recorded investment (3,320) 49 (3,233) 120
Financial effects of modification, Interest (186) (65) (557) (265)
Combination of Concession Types [Member] | Residential Alt-A [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 8 7 13 15
Pre-modification, Recorded investment 1,187 1,509 2,094 2,869
Post-modification, Recorded investment 1,294 1,543 2,219 2,937
Financial effects of modification, Recorded investment 107 34 125 68
Financial effects of modification, Interest (278) (44) (388) (49)
Combination of Concession Types [Member] | Home Equity Lines and Loans [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 8 4 10 6
Pre-modification, Recorded investment 406 480 617 715
Post-modification, Recorded investment 406 480 617 715
Financial effects of modification, Recorded investment            
Financial effects of modification, Interest (64) (123) (97) (147)
Combination of Concession Types [Member] | Automobile [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 62 77 123 189
Pre-modification, Recorded investment 1,044 1,170 1,597 2,779
Post-modification, Recorded investment 1,044 1,170 1,597 2,779
Financial effects of modification, Recorded investment            
Financial effects of modification, Interest (87) (110) (129) (282)
Combination of Concession Types [Member] | Other [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 30 18 72 52
Pre-modification, Recorded investment 707 142 1,924 361
Post-modification, Recorded investment 707 142 1,924 361
Financial effects of modification, Recorded investment            
Financial effects of modification, Interest $ (234) $ (22) $ (501) $ (58)