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Loans and leases and the allowance for credit losses (Details 9) (USD $)
In Thousands, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
Modification
Sep. 30, 2011
Modification
Loan modification activities that were considered troubled debt restructurings  
Number of modifications4041,347
Pre-modification Recorded Investment$ 21,688$ 211,291
Post-modification Recorded Investment21,676202,956
Financial effects of modification recorded investment(12)(8,335)
Financial effects of modification interest(681)(3,063)
Principal deferral [Member] | Commercial, financial, leasing, etc. [Member]
  
Loan modification activities that were considered troubled debt restructurings  
Number of modifications1346
Pre-modification Recorded Investment1,0218,302
Post-modification Recorded Investment1,1158,396
Financial effects of modification recorded investment9494
Principal deferral [Member] | Commercial real estate loans [Member]
  
Loan modification activities that were considered troubled debt restructurings  
Number of modifications624
Pre-modification Recorded Investment1,36113,212
Post-modification Recorded Investment1,30113,041
Financial effects of modification recorded investment(60)(171)
Principal deferral [Member] | Residential builder and developer [Member]
  
Loan modification activities that were considered troubled debt restructurings  
Number of modifications 4
Pre-modification Recorded Investment 18,586
Post-modification Recorded Investment 17,661
Financial effects of modification recorded investment (925)
Principal deferral [Member] | Other commercial construction [Member]
  
Loan modification activities that were considered troubled debt restructurings  
Number of modifications23
Pre-modification Recorded Investment6,1618,436
Post-modification Recorded Investment6,2848,553
Financial effects of modification recorded investment123117
Principal deferral [Member] | Residential real estate excluding Alt-A [Member]
  
Loan modification activities that were considered troubled debt restructurings  
Number of modifications1224
Pre-modification Recorded Investment2,0992,869
Post-modification Recorded Investment2,1242,884
Financial effects of modification recorded investment2515
Principal deferral [Member] | Residential Alt-A [Member]
  
Loan modification activities that were considered troubled debt restructurings  
Number of modifications12
Pre-modification Recorded Investment532605
Post-modification Recorded Investment562638
Financial effects of modification recorded investment3033
Principal deferral [Member] | Home equity lines and loans [Member]
  
Loan modification activities that were considered troubled debt restructurings  
Number of modifications12
Pre-modification Recorded Investment50119
Post-modification Recorded Investment50119
Principal deferral [Member] | Automobile [Member]
  
Loan modification activities that were considered troubled debt restructurings  
Number of modifications70261
Pre-modification Recorded Investment9103,634
Post-modification Recorded Investment9103,634
Principal deferral [Member] | Other [Member]
  
Loan modification activities that were considered troubled debt restructurings  
Number of modifications123424
Pre-modification Recorded Investment1,2915,338
Post-modification Recorded Investment1,2915,338
Other [Member] | Residential builder and developer [Member]
  
Loan modification activities that were considered troubled debt restructurings  
Number of modifications16
Pre-modification Recorded Investment1,700118,114
Post-modification Recorded Investment1,350110,156
Financial effects of modification recorded investment(350)(7,958)
Other [Member] | Home equity lines and loans [Member]
  
Loan modification activities that were considered troubled debt restructurings  
Number of modifications11
Pre-modification Recorded Investment4343
Post-modification Recorded Investment4343
Financial effects of modification recorded investment00
Financial effects of modification interest00
Interest Rate Reduction [Member] | Residential real estate excluding Alt-A [Member]
  
Loan modification activities that were considered troubled debt restructurings  
Number of modifications112
Pre-modification Recorded Investment861,764
Post-modification Recorded Investment861,804
Financial effects of modification recorded investment 40
Financial effects of modification interest(7)(70)
Interest Rate Reduction [Member] | Automobile [Member]
  
Loan modification activities that were considered troubled debt restructurings  
Number of modifications13
Pre-modification Recorded Investment1149
Post-modification Recorded Investment1149
Financial effects of modification interest (3)
Interest Rate Reduction [Member] | Other [Member]
  
Loan modification activities that were considered troubled debt restructurings  
Number of modifications615
Pre-modification Recorded Investment50143
Post-modification Recorded Investment50143
Financial effects of modification interest(5)(10)
Combination of concession types [Member] | Commercial, financial, leasing, etc. [Member]
  
Loan modification activities that were considered troubled debt restructurings  
Number of modifications 1
Pre-modification Recorded Investment 1,945
Post-modification Recorded Investment 1,945
Financial effects of modification interest (641)
Combination of concession types [Member] | Residential builder and developer [Member]
  
Loan modification activities that were considered troubled debt restructurings  
Number of modifications 1
Pre-modification Recorded Investment 798
Post-modification Recorded Investment 790
Financial effects of modification recorded investment (8)
Combination of concession types [Member] | Residential real estate excluding Alt-A [Member]
  
Loan modification activities that were considered troubled debt restructurings  
Number of modifications2281
Pre-modification Recorded Investment2,97216,066
Post-modification Recorded Investment3,04416,385
Financial effects of modification recorded investment72319
Financial effects of modification interest(51)(864)
Combination of concession types [Member] | Residential Alt-A [Member]
  
Loan modification activities that were considered troubled debt restructurings  
Number of modifications823
Pre-modification Recorded Investment1,3934,255
Post-modification Recorded Investment1,4464,362
Financial effects of modification recorded investment53107
Financial effects of modification interest(341)(572)
Combination of concession types [Member] | Home equity lines and loans [Member]
  
Loan modification activities that were considered troubled debt restructurings  
Number of modifications919
Pre-modification Recorded Investment6961,484
Post-modification Recorded Investment6971,486
Financial effects of modification recorded investment12
Financial effects of modification interest(157)(272)
Combination of concession types [Member] | Automobile [Member]
  
Loan modification activities that were considered troubled debt restructurings  
Number of modifications84249
Pre-modification Recorded Investment9242,815
Post-modification Recorded Investment9242,815
Financial effects of modification interest(57)(205)
Combination of concession types [Member] | Other [Member]
  
Loan modification activities that were considered troubled debt restructurings  
Number of modifications43146
Pre-modification Recorded Investment3882,714
Post-modification Recorded Investment3882,714
Financial effects of modification interest$ (63)$ (426)