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Loans and leases and the allowance for credit losses (Details 9) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Modification
Jun. 30, 2011
Modification
Jun. 30, 2012
Modification
Jun. 30, 2011
Modification
Loan modification activities that were considered troubled debt restructurings        
Number of modifications 384 458 829 943
Pre-modification Recorded Investment $ 89,684 $ 41,651 $ 116,312 $ 189,602
Post-modification Recorded Investment 88,494 40,830 115,155 181,279
Financial effects of modification recorded investment (1,190) (821) (1,157) (8,323)
Financial effects of modification interest (710) (927) (1,193) (2,439)
Principal deferral [Member] | Commercial, financial, leasing [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications 9 20 18 33
Pre-modification Recorded Investment 10,392 5,932 13,204 7,281
Post-modification Recorded Investment 9,061 5,947 12,015 7,281
Financial effects of modification recorded investment (1,331) 15 (1,189)   
Financial effects of modification interest            
Principal deferral [Member] | Commercial real estate loans [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications 1 9 3 18
Pre-modification Recorded Investment 2,011 5,226 4,436 11,851
Post-modification Recorded Investment 1,999 5,143 4,404 11,740
Financial effects of modification recorded investment (12) (83) (32) (111)
Financial effects of modification interest            
Principal deferral [Member] | Residential builder and developer [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications 3 3 8 4
Pre-modification Recorded Investment 2,503 15,162 9,325 18,586
Post-modification Recorded Investment 2,503 14,237 8,537 17,661
Financial effects of modification recorded investment    (925) (788) (925)
Financial effects of modification interest            
Principal deferral [Member] | Other commercial construction [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications 3   3 1
Pre-modification Recorded Investment 60,888   60,888 2,275
Post-modification Recorded Investment 60,898   60,898 2,269
Financial effects of modification recorded investment 10   10 (6)
Financial effects of modification interest           
Principal deferral [Member] | Residential real estate excluding Alt-A [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications 7 9 22 12
Pre-modification Recorded Investment 1,059 646 2,564 770
Post-modification Recorded Investment 1,087 622 2,675 760
Financial effects of modification recorded investment 28 (24) 111 (10)
Financial effects of modification interest            
Principal deferral [Member] | Residential Alt-A [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications 1 1 4 1
Pre-modification Recorded Investment 153 73 550 73
Post-modification Recorded Investment 158 76 565 76
Financial effects of modification recorded investment 5 3 15 3
Financial effects of modification interest            
Principal deferral [Member] | Home equity lines and loans [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications 9 1 10 1
Pre-modification Recorded Investment 734 69 851 69
Post-modification Recorded Investment 734 69 851 69
Financial effects of modification recorded investment            
Financial effects of modification interest            
Principal deferral [Member] | Automobile [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications 196 217 349 421
Pre-modification Recorded Investment 2,700 2,845 4,585 6,338
Post-modification Recorded Investment 2,700 2,845 4,585 6,338
Financial effects of modification recorded investment            
Financial effects of modification interest            
Principal deferral [Member] | Other [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications 7 3 59 13
Pre-modification Recorded Investment 134 88 781 162
Post-modification Recorded Investment 134 88 781 162
Financial effects of modification recorded investment            
Financial effects of modification interest            
Other [Member] | Commercial, financial, leasing [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications 2   3  
Pre-modification Recorded Investment 1,995   2,967  
Post-modification Recorded Investment 1,954   3,052  
Financial effects of modification recorded investment (41)   85  
Financial effects of modification interest          
Other [Member] | Residential builder and developer [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications   1   5
Pre-modification Recorded Investment   412   116,414
Post-modification Recorded Investment   412   108,806
Financial effects of modification recorded investment        (7,608)
Financial effects of modification interest          
Other [Member] | Automobile [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications 21 31 31 57
Pre-modification Recorded Investment 152 151 171 258
Post-modification Recorded Investment 152 151 171 258
Financial effects of modification recorded investment            
Financial effects of modification interest            
Other [Member] | Other [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications     9 1
Pre-modification Recorded Investment     49 11
Post-modification Recorded Investment     49 11
Financial effects of modification recorded investment          
Financial effects of modification interest          
Interest Rate Reduction [Member] | Commercial real estate loans [Member]
        
Loan modification activities that were considered troubled debt restructurings        
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] | Residential real estate excluding Alt-A [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications   3   11
Pre-modification Recorded Investment   619   1,678
Post-modification Recorded Investment   639   1,718
Financial effects of modification recorded investment   20   40
Financial effects of modification interest   (13)   (63)
Interest Rate Reduction [Member] | Home equity lines and loans [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications     1  
Pre-modification Recorded Investment     144  
Post-modification Recorded Investment     144  
Financial effects of modification recorded investment         
Financial effects of modification interest     (6)  
Interest Rate Reduction [Member] | Automobile [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications 3 7 7 11
Pre-modification Recorded Investment 20 87 77 131
Post-modification Recorded Investment 20 87 77 131
Financial effects of modification recorded investment            
Financial effects of modification interest (1) (5) (5) (8)
Interest Rate Reduction [Member] | Other [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications     3  
Pre-modification Recorded Investment     23  
Post-modification Recorded Investment     23  
Financial effects of modification recorded investment         
Financial effects of modification interest     (3)  
Combination of concession types [Member] | Commercial, financial, leasing [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications   1 1 1
Pre-modification Recorded Investment   1,945 45 1,945
Post-modification Recorded Investment   1,945 44 1,945
Financial effects of modification recorded investment      (1)   
Financial effects of modification interest   (641) (33) (641)
Combination of concession types [Member] | Commercial real estate loans [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications 4   4  
Pre-modification Recorded Investment 1,210   1,210  
Post-modification Recorded Investment 1,231   1,231  
Financial effects of modification recorded investment 21   21  
Financial effects of modification interest (256)   (256)  
Combination of concession types [Member] | Residential builder and developer [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications     2 1
Pre-modification Recorded Investment     2,350 798
Post-modification Recorded Investment     2,726 790
Financial effects of modification recorded investment     376 (8)
Financial effects of modification interest          
Combination of concession types [Member] | Residential real estate excluding Alt-A [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications 11 29 29 59
Pre-modification Recorded Investment 2,049 5,187 4,985 13,094
Post-modification Recorded Investment 2,098 5,342 5,105 13,341
Financial effects of modification recorded investment 49 155 120 247
Financial effects of modification interest (65) (56) (265) (813)
Combination of concession types [Member] | Residential Alt-A [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications 7 6 15 15
Pre-modification Recorded Investment 1,509 1,260 2,869 2,862
Post-modification Recorded Investment 1,543 1,278 2,937 2,916
Financial effects of modification recorded investment 34 18 68 54
Financial effects of modification interest (44) (21) (49) (231)
Combination of concession types [Member] | Home equity lines and loans [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications 4 8 6 10
Pre-modification Recorded Investment 480 719 715 789
Post-modification Recorded Investment 480 719 715 790
Financial effects of modification recorded investment          1
Financial effects of modification interest (123) (91) (147) (127)
Combination of concession types [Member] | Automobile [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications 77 100 189 222
Pre-modification Recorded Investment 1,170 1,139 2,779 4,000
Post-modification Recorded Investment 1,170 1,139 2,779 4,000
Financial effects of modification recorded investment            
Financial effects of modification interest (110) (80) (282) (516)
Combination of concession types [Member] | Other [Member]
        
Loan modification activities that were considered troubled debt restructurings        
Number of modifications 18 9 52 46
Pre-modification Recorded Investment 142 91 361 217
Post-modification Recorded Investment 142 91 361 217
Financial effects of modification recorded investment            
Financial effects of modification interest $ (22) $ (20) $ (58) $ (40)