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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 9 Months Ended
Sep. 30, 2013
Modification
Sep. 30, 2012
Modification
Sep. 30, 2013
Modification
Sep. 30, 2012
Modification
Financing Receivable, Modifications [Line Items]        
Number of modifications 310 409 983 1,238
Pre-modification, Recorded investment $ 18,441 $ 55,191 $ 233,447 $ 171,503
Post-modification, Recorded investment 19,189 53,591 229,746 168,746
Financial effects of modification, Recorded investment 748 (1,600) (3,701) (2,757)
Financial effects of modification, Interest (830) (790) (3,118) (1,983)
Principal deferral [Member] | Commercial, Financial, Leasing, etc. [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 14 21 53 39
Pre-modification, Recorded investment 2,407 7,823 9,283 21,027
Post-modification, Recorded investment 2,266 7,653 9,070 19,668
Financial effects of modification, Recorded investment (141) (170) (213) (1,359)
Financial effects of modification, Interest            
Principal deferral [Member] | Commercial Real Estate [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 10 8 23 11
Pre-modification, Recorded investment 4,160 5,951 38,187 10,387
Post-modification, Recorded investment 4,134 6,238 38,027 10,642
Financial effects of modification, Recorded investment (26) 287 (160) 255
Financial effects of modification, Interest            
Principal deferral [Member] | Residential Builder and Developer [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 1 11 16 19
Pre-modification, Recorded investment 249 17,383 19,102 26,708
Post-modification, Recorded investment 241 16,275 18,303 24,812
Financial effects of modification, Recorded investment (8) (1,108) (799) (1,896)
Financial effects of modification, Interest            
Principal deferral [Member] | Other Commercial Construction [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 1 2 3 5
Pre-modification, Recorded investment 226 5,429 590 66,317
Post-modification, Recorded investment 158 4,702 521 65,600
Financial effects of modification, Recorded investment (68) (727) (69) (717)
Financial effects of modification, Interest            
Principal deferral [Member] | Residential [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 6 5 21 27
Pre-modification, Recorded investment 860 738 2,642 3,302
Post-modification, Recorded investment 912 772 2,877 3,447
Financial effects of modification, Recorded investment 52 34 235 145
Financial effects of modification, Interest            
Principal deferral [Member] | Residential Alt-A [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 5 1 6 5
Pre-modification, Recorded investment 764 218 863 768
Post-modification, Recorded investment 773 220 875 785
Financial effects of modification, Recorded investment 9 2 12 17
Financial effects of modification, Interest            
Principal deferral [Member] | Home Equity Lines and Loans [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 2 5 6 15
Pre-modification, Recorded investment 179 434 359 1,285
Post-modification, Recorded investment 179 434 361 1,285
Financial effects of modification, Recorded investment       2   
Financial effects of modification, Interest            
Principal deferral [Member] | Automobile [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 121 135 359 484
Pre-modification, Recorded investment 1,718 1,721 4,933 6,306
Post-modification, Recorded investment 1,718 1,721 4,933 6,306
Financial effects of modification, Recorded investment            
Financial effects of modification, Interest            
Principal deferral [Member] | Other [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 9 14 29 73
Pre-modification, Recorded investment 60 336 290 1,117
Post-modification, Recorded investment 60 336 290 1,117
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 2   4 3
Pre-modification, Recorded investment 1,773   50,433 2,967
Post-modification, Recorded investment 2,067   50,924 3,052
Financial effects of modification, Recorded investment 294   491 85
Financial effects of modification, Interest           
Other [Member] | Commercial Real Estate [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 2   2  
Pre-modification, Recorded investment 449   449  
Post-modification, Recorded investment 475   475  
Financial effects of modification, Recorded investment 26   26  
Financial effects of modification, Interest          
Other [Member] | Residential Builder and Developer [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications     1  
Pre-modification, Recorded investment     4,039  
Post-modification, Recorded investment     3,888  
Financial effects of modification, Recorded investment     (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  
Pre-modification, Recorded investment     106  
Post-modification, Recorded investment     106  
Financial effects of modification, Recorded investment         
Financial effects of modification, Interest         
Other [Member] | Automobile [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 20 20 65 51
Pre-modification, Recorded investment 42 68 274 239
Post-modification, Recorded investment 42 68 274 239
Financial effects of modification, Recorded investment            
Financial effects of modification, Interest            
Other [Member] | Other [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications   1 1 10
Pre-modification, Recorded investment   1 12 50
Post-modification, Recorded investment   1 12 50
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
Pre-modification, Recorded investment       383
Post-modification, Recorded investment       430
Financial effects of modification, Recorded investment       47
Financial effects of modification, Interest       (89)
Interest rate reduction [Member] | Home Equity Lines and Loans [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications     1 1
Pre-modification, Recorded investment     99 144
Post-modification, Recorded investment     99 144
Financial effects of modification, Recorded investment          
Financial effects of modification, Interest     (8) (6)
Interest rate reduction [Member] | Automobile [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 2 9 11 16
Pre-modification, Recorded investment 19 157 159 234
Post-modification, Recorded investment 19 157 159 234
Financial effects of modification, Recorded investment            
Financial effects of modification, Interest (2) (11) (17) (16)
Interest rate reduction [Member] | Other [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications     1 3
Pre-modification, Recorded investment     12 23
Post-modification, Recorded investment     12 23
Financial effects of modification, Recorded investment          
Financial effects of modification, Interest     (2) (3)
Combination of concession types [Member] | Commercial, Financial, Leasing, etc. [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 3 2 6 3
Pre-modification, Recorded investment 374 327 2,206 372
Post-modification, Recorded investment 374 322 1,696 366
Financial effects of modification, Recorded investment    (5) (510) (6)
Financial effects of modification, Interest (25) (39) (25) (72)
Combination of concession types [Member] | Commercial Real Estate [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 6 1 8 5
Pre-modification, Recorded investment 1,868 214 2,450 1,424
Post-modification, Recorded investment 2,264 214 2,845 1,445
Financial effects of modification, Recorded investment 396    395 21
Financial effects of modification, Interest (156) (49) (212) (305)
Combination of concession types [Member] | Residential Builder and Developer [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications   1 3 3
Pre-modification, Recorded investment   2,486 15,580 4,836
Post-modification, Recorded investment   2,486 15,514 5,212
Financial effects of modification, Recorded investment      (66) 376
Financial effects of modification, Interest      (535)   
Combination of concession types [Member] | Residential [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 14 18 52 47
Pre-modification, Recorded investment 1,258 5,490 72,917 10,475
Post-modification, Recorded investment 1,308 5,553 69,734 10,658
Financial effects of modification, Recorded investment 50 63 (3,183) 183
Financial effects of modification, Interest (197) (150) (754) (415)
Combination of concession types [Member] | Residential Alt-A [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 4 13 17 28
Pre-modification, Recorded investment 332 2,771 2,426 5,640
Post-modification, Recorded investment 496 2,795 2,715 5,732
Financial effects of modification, Recorded investment 164 24 289 92
Financial effects of modification, Interest (252)    (640) (49)
Combination of concession types [Member] | Home Equity Lines and Loans [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 9 11 19 17
Pre-modification, Recorded investment 682 976 1,299 1,691
Post-modification, Recorded investment 682 976 1,299 1,691
Financial effects of modification, Recorded investment            
Financial effects of modification, Interest (79) (125) (176) (272)
Combination of concession types [Member] | Automobile [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 61 109 184 298
Pre-modification, Recorded investment 551 2,329 2,148 5,108
Post-modification, Recorded investment 551 2,329 2,148 5,108
Financial effects of modification, Recorded investment            
Financial effects of modification, Interest (33) (319) (162) (601)
Combination of concession types [Member] | Other [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 18 22 90 74
Pre-modification, Recorded investment 470 339 2,394 700
Post-modification, Recorded investment 470 339 2,394 700
Financial effects of modification, Recorded investment            
Financial effects of modification, Interest $ (86) $ (97) $ (587) $ (155)