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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, 2012
Modification
Sep. 30, 2011
Modification
Sep. 30, 2012
Modification
Sep. 30, 2011
Modification
Financing Receivable, Modifications [Line Items]        
Number of modifications 409 404 1,238 1,347
Pre-modification Recorded Investment $ 55,191 $ 21,688 $ 171,503 $ 211,291
Post-modification Recorded Investment 53,591 21,676 168,746 202,956
Financial effects of modification recorded investment (1,600) (12) (2,757) (8,335)
Financial effects of modification interest (790) (681) (1,983) (3,063)
Principal deferral [Member] | Commercial, financial, leasing, etc [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 21 13 39 46
Pre-modification Recorded Investment 7,823 1,021 21,027 8,302
Post-modification Recorded Investment 7,653 1,115 19,668 8,396
Financial effects of modification recorded investment (170) 94 (1,359) 94
Principal deferral [Member] | Commercial real estate loans [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 8 6 11 24
Pre-modification Recorded Investment 5,951 1,361 10,387 13,212
Post-modification Recorded Investment 6,238 1,301 10,642 13,041
Financial effects of modification recorded investment 287 (60) 255 (171)
Principal deferral [Member] | Residential builder and developer [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 11   19 4
Pre-modification Recorded Investment 17,383   26,708 18,586
Post-modification Recorded Investment 16,275   24,812 17,661
Financial effects of modification recorded investment (1,108)   (1,896) (925)
Principal deferral [Member] | Other commercial construction [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 2 2 5 3
Pre-modification Recorded Investment 5,429 6,161 66,317 8,436
Post-modification Recorded Investment 4,702 6,284 65,600 8,553
Financial effects of modification recorded investment (727) 123 (717) 117
Principal deferral [Member] | Residential [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 5 12 27 24
Pre-modification Recorded Investment 738 2,099 3,302 2,869
Post-modification Recorded Investment 772 2,124 3,447 2,884
Financial effects of modification recorded investment 34 25 145 15
Principal deferral [Member] | Residential Alt-A [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 1 1 5 2
Pre-modification Recorded Investment 218 532 768 605
Post-modification Recorded Investment 220 562 785 638
Financial effects of modification recorded investment 2 30 17 33
Principal deferral [Member] | Home equity lines and loans [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 5 1 15 2
Pre-modification Recorded Investment 434 50 1,285 119
Post-modification Recorded Investment 434 50 1,285 119
Principal deferral [Member] | Automobile [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 135 159 484 580
Pre-modification Recorded Investment 1,721 1,655 6,306 7,993
Post-modification Recorded Investment 1,721 1,655 6,306 7,993
Principal deferral [Member] | Other [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 14 7 73 20
Pre-modification Recorded Investment 336 186 1,117 348
Post-modification Recorded Investment 336 186 1,117 348
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 327   372 1,945
Post-modification Recorded Investment 322   366 1,945
Financial effects of modification recorded investment (5)   (6)  
Financial effects of modification interest (39)   (72) (641)
Combination of concession types [Member] | Commercial real estate loans [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 1   5  
Pre-modification Recorded Investment 214   1,424  
Post-modification Recorded Investment 214   1,445  
Financial effects of modification recorded investment     21  
Financial effects of modification interest (49)   (305)  
Combination of concession types [Member] | Residential builder and developer [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 1   3 1
Pre-modification Recorded Investment 2,486   4,836 798
Post-modification Recorded Investment 2,486   5,212 790
Financial effects of modification recorded investment     376 (8)
Combination of concession types [Member] | Residential [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 18 22 47 81
Pre-modification Recorded Investment 5,490 2,972 10,475 16,066
Post-modification Recorded Investment 5,553 3,044 10,658 16,385
Financial effects of modification recorded investment 63 72 183 319
Financial effects of modification interest (150) (51) (415) (864)
Combination of concession types [Member] | Residential Alt-A [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 13 8 28 23
Pre-modification Recorded Investment 2,771 1,393 5,640 4,255
Post-modification Recorded Investment 2,795 1,446 5,732 4,362
Financial effects of modification recorded investment 24 53 92 107
Financial effects of modification interest   (341) (49) (572)
Combination of concession types [Member] | Home equity lines and loans [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 11 9 17 19
Pre-modification Recorded Investment 976 696 1,691 1,484
Post-modification Recorded Investment 976 697 1,691 1,486
Financial effects of modification recorded investment   1   2
Financial effects of modification interest (125) (157) (272) (272)
Combination of concession types [Member] | Automobile [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 109 96 298 318
Pre-modification Recorded Investment 2,329 1,049 5,108 5,049
Post-modification Recorded Investment 2,329 1,049 5,108 5,049
Financial effects of modification interest (319) (57) (601) (556)
Combination of concession types [Member] | Other [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 22 31 74 77
Pre-modification Recorded Investment 339 263 700 482
Post-modification Recorded Investment 339 263 700 482
Financial effects of modification interest (97) (63) (155) (75)
Interest rate reduction [Member] | Commercial real estate loans [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] | Residential [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications   1   12
Pre-modification Recorded Investment   86   1,764
Post-modification Recorded Investment   86   1,804
Financial effects of modification recorded investment       40
Financial effects of modification interest   (7)   (70)
Interest rate reduction [Member] | Home equity lines and loans [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications     1  
Pre-modification Recorded Investment     144  
Post-modification Recorded Investment     144  
Financial effects of modification interest     (6)  
Interest rate reduction [Member] | Automobile [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 9 6 16 17
Pre-modification Recorded Investment 157 52 234 183
Post-modification Recorded Investment 157 52 234 183
Financial effects of modification interest (11) (4) (16) (12)
Interest rate reduction [Member] | Other [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications   1 3 1
Pre-modification Recorded Investment   9 23 9
Post-modification Recorded Investment   9 23 9
Financial effects of modification interest   (1) (3) (1)
Other [Member] | Commercial, financial, leasing, etc [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications     3  
Pre-modification Recorded Investment     2,967  
Post-modification Recorded Investment     3,052  
Financial effects of modification recorded investment     85  
Other [Member] | Residential builder and developer [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications   1   6
Pre-modification Recorded Investment   1,700   118,114
Post-modification Recorded Investment   1,350   110,156
Financial effects of modification recorded investment   (350)   (7,958)
Other [Member] | Home equity lines and loans [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications   1   1
Pre-modification Recorded Investment   43   43
Post-modification Recorded Investment   43   43
Other [Member] | Automobile [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 20 26 51 83
Pre-modification Recorded Investment 68 279 239 537
Post-modification Recorded Investment 68 279 239 537
Other [Member] | Other [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of modifications 1 1 10 2
Pre-modification Recorded Investment 1 81 50 92
Post-modification Recorded Investment $ 1 $ 81 $ 50 $ 92