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Loans, Allowance for Loan Losses, and Credit Quality (Tables)
 12 Months Ended
Dec. 31, 2012
Financing Receivable, Impaired [Line Items]  
Loan composition
    20122011 
    ($ in Thousands) 
Commercial and industrial$4,502,021$3,724,736 
Commercial real estate - owner occupied 1,219,747 1,086,829 
Lease financing 64,196 58,194 
 Commercial and business lending 5,785,964 4,869,759 
Commercial real estate - investor 2,906,759 2,563,767 
Real estate construction 655,381 584,046 
 Commercial real estate lending 3,562,140 3,147,813 
  Total commercial 9,348,104 8,017,572 
Home equity 2,219,494 2,504,704 
Installment 466,727 557,782 
 Total retail 2,686,221 3,062,486 
Residential mortgage 3,376,697 2,951,013 
  Total consumer 6,062,918 6,013,499 
   Total loans$15,411,022$14,031,071 
Changes in the allowance for loan losses
A summary of the changes in the allowance for loan losses for the years indicated was as follows.
         
  201220112010 
  ($ in Thousands) 
Balance at beginning of year$378,151$476,813$573,533 
Provision for loan losses 3,000 52,000 390,010 
Charge offs (117,046) (189,732) (528,492) 
Recoveries 33,304 39,070 41,762 
 Net charge offs (83,742) (150,662) (486,730) 
Balance at end of year$297,409$378,151$476,813 
Changes in the allowance for loan losses by portfolio segment
A summary of the changes in the allowance for loan losses by portfolio segment for the year ended December 31, 2012, was as follows.
                   
$ in ThousandsCommercial and industrialCommercial real estate - owner occupiedLease financingCommercial real estate- investorReal estate constructionHome equityInstallmentResidential mortgage Total
Balance at Dec 31, 2011$ 124,374$ 36,200$ 2,567$ 86,689$ 21,327$ 70,144$ 6,623$ 30,227$ 378,151
Provision for loan losses  (1,645)  (5,184)  (645)  (14,304)  873  16,909  (501)  7,497  3,000
Charge offs  (43,240)  (4,080)  (797)  (14,000)  (3,588)  (34,125)  (3,057)  (14,159)  (117,046)
Recoveries  18,363  453  1,899  4,796  2,129  3,898  1,234  532  33,304
Balance at Dec 31, 2012$ 97,852$ 27,389$ 3,024$ 63,181$ 20,741$ 56,826$ 4,299$ 24,097$ 297,409
                   
Allowance for loan losses:              
Ending balance impaired loans individually evaluated for impairment$ 8,790$ 654$ -$ 5,241$ 1,079$ 868$ -$ 155$ 16,787
Ending balance impaired loans collectively evaluated for impairment$ 4,951$ 3,157$ -$ 4,446$ 2,332$ 23,712$ 1,155$ 12,751$ 52,504
Total impaired loans$ 13,741$ 3,811$ -$ 9,687$ 3,411$ 24,580$ 1,155$ 12,906$ 69,291
Ending balance all other loans collectively evaluated for impairment$ 84,111$ 23,578$ 3,024$ 53,494$ 17,330$ 32,246$ 3,144$ 11,191$ 228,118
Total$ 97,852$ 27,389$ 3,024$ 63,181$ 20,741$ 56,826$ 4,299$ 24,097$ 297,409
                   
Loans:                  
Ending balance impaired loans individually evaluated for impairment$ 27,213$ 16,602$ 3,024$ 48,894$ 20,794$ 4,671$ -$ 11,330$ 132,528
Ending balance impaired loans collectively evaluated for impairment$ 40,109$ 21,504$ 7$ 51,453$ 11,038$ 44,512$ 2,491$ 70,313$ 241,427
Impaired loan subtotal$ 67,322$ 38,106$ 3,031$ 100,347$ 31,832$ 49,183$ 2,491$ 81,643$ 373,955
Ending balance all other loans collectively evaluated for impairment$ 4,434,699$ 1,181,641$ 61,165$ 2,806,412$ 623,549$ 2,170,311$ 464,236$ 3,295,054$ 15,037,067
Total$ 4,502,021$ 1,219,747$ 64,196$ 2,906,759$ 655,381$ 2,219,494$ 466,727$ 3,376,697$ 15,411,022

For comparison purposes, a summary of the changes in the allowance for loan losses by portfolio segment for the year ended December 31, 2011, was as follows.
                   
$ in ThousandsCommercial and industrialCommercial real estate - owner occupiedLease financingCommercial real estate- investorReal estate constructionHome equityInstallmentResidential mortgage Total
Balance at Dec 31, 2010$ 137,770$ 54,320$ 7,396$ 111,264$ 56,772$ 55,090$ 17,328$ 36,873$ 476,813
Provision for loan losses  8,916  (11,144)  (6,611)  (762)  (4,744)  54,476  3,845  8,024  52,000
Charge offs  (38,662)  (9,485)  (173)  (29,479)  (38,222)  (42,623)  (16,134)  (14,954)  (189,732)
Recoveries  16,350  2,509  1,955  5,666  7,521  3,201  1,584  284  39,070
Balance at Dec 31, 2011$ 124,374$ 36,200$ 2,567$ 86,689$ 21,327$ 70,144$ 6,623$ 30,227$ 378,151
                   
Allowance for loan losses:              
Ending balance impaired loans individually evaluated for impairment$ 7,619$ 3,608$ 161$ 16,623$ 4,919$ 2,922$ -$ 957$ 36,809
Ending balance impaired loans collectively evaluated for impairment$ 7,688$ 3,962$ 34$ 8,378$ 4,266$ 27,914$ 2,021$ 13,707$ 67,970
Total impaired loans$ 15,307$ 7,570$ 195$ 25,001$ 9,185$ 30,836$ 2,021$ 14,664$ 104,779
Ending balance all other loans collectively evaluated for impairment$ 109,067$ 28,630$ 2,372$ 61,688$ 12,142$ 39,308$ 4,602$ 15,563$ 273,372
Total$ 124,374$ 36,200$ 2,567$ 86,689$ 21,327$ 70,144$ 6,623$ 30,227$ 378,151
                   
Loans:                  
Ending balance impaired loans individually evaluated for impairment$ 41,474$ 26,049$ 9,792$ 85,287$ 31,933$ 9,542$ -$ 11,401$ 215,478
Ending balance impaired loans collectively evaluated for impairment$ 37,153$ 17,807$ 852$ 57,482$ 20,850$ 46,315$ 3,730$ 70,269$ 254,458
Impaired loan subtotal$ 78,627$ 43,856$ 10,644$ 142,769$ 52,783$ 55,857$ 3,730$ 81,670$ 469,936
Ending balance all other loans collectively evaluated for impairment$ 3,646,109$ 1,042,973$ 47,550$ 2,420,998$ 531,263$ 2,448,847$ 554,052$ 2,869,343$ 13,561,135
Total$ 3,724,736$ 1,086,829$ 58,194$ 2,563,767$ 584,046$ 2,504,704$ 557,782$ 2,951,013$ 14,031,071
Summarized details of Loans
The following table presents loans by past due status at December 31, 2012.
                
     30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due * Total Past Due Current Total
    ($ in Thousands)
Accruing loans            
Commercial and industrial$ 9,557$ 1,782$ 79$ 11,418$ 4,451,421$ 4,462,839
Commercial real estate - owner occupied  10,420  633  308  11,361  1,184,132  1,195,493
Lease financing  -  12  -  12  61,153  61,165
 Commercial and business lending  19,977  2,427  387  22,791  5,696,706  5,719,497
Commercial real estate - investor  8,424  5,048  366  13,838  2,834,234  2,848,072
Real estate construction  1,628  1,527  283  3,438  624,641  628,079
 Commercial real estate lending  10,052  6,575  649  17,276  3,458,875  3,476,151
  Total commercial  30,029  9,002  1,036  40,067  9,155,581  9,195,648
Home equity  10,151  3,387  96  13,634  2,166,645  2,180,279
Installment  1,300  809  1,013  3,122  461,767  464,889
 Total retail  11,451  4,196  1,109  16,756  2,628,412  2,645,168
 Residential mortgage  8,473  930  144  9,547  3,307,791  3,317,338
  Total consumer  19,924  5,126  1,253  26,303  5,936,203  5,962,506
   Total accruing loans$ 49,953$ 14,128$ 2,289$ 66,370$ 15,091,784$ 15,158,154
                
Nonaccrual loans            
Commercial and industrial$ 8,559$ 791$ 11,962$ 21,312$ 17,870$ 39,182
Commercial real estate - owner occupied  1,489  1,749  11,819  15,057  9,197  24,254
Lease financing  15  -  9  24  3,007  3,031
 Commercial and business lending  10,063  2,540  23,790  36,393  30,074  66,467
Commercial real estate - investor  197  3,072  30,928  34,197  24,490  58,687
Real estate construction  16  -  9,639  9,655  17,647  27,302
 Commercial real estate lending  213  3,072  40,567  43,852  42,137  85,989
  Total commercial  10,276  5,612  64,357  80,245  72,211  152,456
Home equity  1,456  2,518  28,474  32,448  6,767  39,215
Installment  153  141  586  880  958  1,838
 Total retail  1,609  2,659  29,060  33,328  7,725  41,053
 Residential mortgage  2,135  4,321  38,739  45,195  14,164  59,359
  Total consumer  3,744  6,980  67,799  78,523  21,889  100,412
   Total nonaccrual loans$ 14,020$ 12,592$ 132,156$ 158,768$ 94,100$ 252,868
                
Total loans            
Commercial and industrial$ 18,116$ 2,573$ 12,041$ 32,730$ 4,469,291$ 4,502,021
Commercial real estate - owner occupied  11,909  2,382  12,127  26,418  1,193,329  1,219,747
Lease financing  15  12  9  36  64,160  64,196
 Commercial and business lending  30,040  4,967  24,177  59,184  5,726,780  5,785,964
Commercial real estate - investor  8,621  8,120  31,294  48,035  2,858,724  2,906,759
Real estate construction  1,644  1,527  9,922  13,093  642,288  655,381
 Commercial real estate lending  10,265  9,647  41,216  61,128  3,501,012  3,562,140
  Total commercial  40,305  14,614  65,393  120,312  9,227,792  9,348,104
Home equity  11,607  5,905  28,570  46,082  2,173,412  2,219,494
Installment  1,453  950  1,599  4,002  462,725  466,727
 Total retail  13,060  6,855  30,169  50,084  2,636,137  2,686,221
 Residential mortgage  10,608  5,251  38,883  54,742  3,321,955  3,376,697
  Total consumer  23,668  12,106  69,052  104,826  5,958,092  6,062,918
   Total loans$ 63,973$ 26,720$ 134,445$ 225,138$ 15,185,884$ 15,411,022
                
* The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at December 31, 2012 (the same as the reported balances for the accruing loans noted above).

The following table presents loans by past due status at December 31, 2011.
                
     30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due * Total Past Due Current Total
    ($ in Thousands)
Accruing loans            
Commercial and industrial$ 3,513$ 5,230$ 3,755$ 12,498$ 3,656,163$ 3,668,661
Commercial real estate - owner occupied  6,788  304  -  7,092  1,044,019  1,051,111
Lease financing  31  73  -  104  47,446  47,550
 Commercial and business lending  10,332  5,607  3,755  19,694  4,747,628  4,767,322
Commercial real estate - investor  2,770  2,200  -  4,970  2,459,445  2,464,415
Real estate construction  873  123  481  1,477  540,763  542,240
 Commercial real estate lending  3,643  2,323  481  6,447  3,000,208  3,006,655
  Total commercial  13,975  7,930  4,236  26,141  7,747,836  7,773,977
Home equity  9,399  2,790  -  12,189  2,445,608  2,457,797
Installment  1,784  808  689  3,281  551,786  555,067
 Total retail  11,183  3,598  689  15,470  2,997,394  3,012,864
 Residential mortgage  6,320  904  -  7,224  2,880,234  2,887,458
  Total consumer  17,503  4,502  689  22,694  5,877,628  5,900,322
   Total accruing loans$ 31,478$ 12,432$ 4,925$ 48,835$ 13,625,464$ 13,674,299
                
Nonaccrual loans            
Commercial and industrial$ 5,374$ 6,933$ 20,792$ 33,099$ 22,976$ 56,075
Commercial real estate - owner occupied  2,190  185  19,724  22,099  13,619  35,718
Lease financing  -  -  858  858  9,786  10,644
 Commercial and business lending  7,564  7,118  41,374  56,056  46,381  102,437
Commercial real estate - investor  2,332  2,730  31,529  36,591  62,761  99,352
Real estate construction  36  482  18,625  19,143  22,663  41,806
 Commercial real estate lending  2,368  3,212  50,154  55,734  85,424  141,158
  Total commercial  9,932  10,330  91,528  111,790  131,805  243,595
Home equity  2,818  2,408  34,976  40,202  6,705  46,907
Installment  403  373  599  1,375  1,340  2,715
 Total retail  3,221  2,781  35,575  41,577  8,045  49,622
 Residential mortgage  1,981  4,301  43,153  49,435  14,120  63,555
  Total consumer  5,202  7,082  78,728  91,012  22,165  113,177
   Total nonaccrual loans$ 15,134$ 17,412$ 170,256$ 202,802$ 153,970$ 356,772
                
Total loans            
Commercial and industrial$ 8,887$ 12,163$ 24,547$ 45,597$ 3,679,139$ 3,724,736
Commercial real estate - owner occupied  8,978  489  19,724  29,191  1,057,638  1,086,829
Lease financing  31  73  858  962  57,232  58,194
 Commercial and business lending  17,896  12,725  45,129  75,750  4,794,009  4,869,759
Commercial real estate - investor  5,102  4,930  31,529  41,561  2,522,206  2,563,767
Real estate construction  909  605  19,106  20,620  563,426  584,046
 Commercial real estate lending  6,011  5,535  50,635  62,181  3,085,632  3,147,813
  Total commercial  23,907  18,260  95,764  137,931  7,879,641  8,017,572
Home equity  12,217  5,198  34,976  52,391  2,452,313  2,504,704
Installment  2,187  1,181  1,288  4,656  553,126  557,782
 Total retail  14,404  6,379  36,264  57,047  3,005,439  3,062,486
 Residential mortgage  8,301  5,205  43,153  56,659  2,894,354  2,951,013
  Total consumer  22,705  11,584  79,417  113,706  5,899,793  6,013,499
   Total loans$ 46,612$ 29,844$ 175,181$ 251,637$ 13,779,434$ 14,031,071
                
* The recorded investment in loans past due 90 days or more and still accruing totaled $5 million at December 31, 2011 (the same as the reported balances for the accruing loans noted above).
Summarized details of impaired Loans
The following table presents impaired loans at December 31, 2012.
              
     Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized*
Loans with a related allowance  ($ in Thousands)
Commercial and industrial$ 57,985$ 65,521$ 13,741$ 56,508$ 2,187
Commercial real estate - owner occupied  24,600  27,700  3,811  26,531  1,043
Lease financing  7  7  -  120  -
 Commercial and business lending  82,592  93,228  17,552  83,159  3,230
Commercial real estate - investor  80,766  96,581  9,687  85,642  2,891
Real estate construction  16,299  22,311  3,411  19,122  437
 Commercial real estate lending  97,065  118,892  13,098  104,764  3,328
  Total commercial  179,657  212,120  30,650  187,923  6,558
Home equity  47,113  54,456  24,580  50,334  1,962
Installment  2,491  2,847  1,155  2,773  172
 Total retail  49,604  57,303  25,735  53,107  2,134
 Residential mortgage  72,408  81,959  12,906  76,989  2,211
  Total consumer  122,012  139,262  38,641  130,096  4,345
   Total loans$ 301,669$ 351,382$ 69,291$ 318,019$ 10,903
              
Loans with no related allowance           
Commercial and industrial$ 9,337$ 16,339$ -$ 10,883$ 229
Commercial real estate - owner occupied  13,506  16,582  -  14,425  68
Lease financing  3,024  3,024  -  3,896  -
 Commercial and business lending  25,867  35,945  -  29,204  297
Commercial real estate - investor  19,581  28,531  -  20,490  173
Real estate construction  15,533  24,724  -  18,350  109
 Commercial real estate lending  35,114  53,255  -  38,840  282
  Total commercial  60,981  89,200  -  68,044  579
Home equity  2,070  2,269  -  2,164  36
Installment  -  -  -  -  -
 Total retail  2,070  2,269  -  2,164  36
 Residential mortgage  9,235  12,246  -  11,566  208
  Total consumer  11,305  14,515  -  13,730  244
   Total loans$ 72,286$ 103,715$ -$ 81,774$ 823
              
Total          
Commercial and industrial$ 67,322$ 81,860$ 13,741$ 67,391$ 2,416
Commercial real estate - owner occupied  38,106  44,282  3,811  40,956  1,111
Lease financing  3,031  3,031  -  4,016  -
 Commercial and business lending  108,459  129,173  17,552  112,363  3,527
Commercial real estate - investor  100,347  125,112  9,687  106,132  3,064
Real estate construction  31,832  47,035  3,411  37,472  546
 Commercial real estate lending  132,179  172,147  13,098  143,604  3,610
  Total commercial  240,638  301,320  30,650  255,967  7,137
Home equity  49,183  56,725  24,580  52,498  1,998
Installment  2,491  2,847  1,155  2,773  172
 Total retail  51,674  59,572  25,735  55,271  2,170
 Residential mortgage  81,643  94,205  12,906  88,555  2,419
  Total consumer  133,317  153,777  38,641  143,826  4,589
   Total loans$ 373,955$ 455,097$ 69,291$ 399,793$ 11,726
              
*Interest income recognized included $6 million of interest income recognized on accruing restructured loans for the year ended December 31, 2012.

The following table presents impaired loans at December 31, 2011.
              
     Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized*
Loans with a related allowance  ($ in Thousands)
Commercial and industrial$ 57,380$ 65,945$ 15,307$ 65,042$ 2,265
Commercial real estate - owner occupied  27,456  31,221  7,570  28,938  587
Lease financing  1,176  1,176  195  1,792  40
 Commercial and business lending  86,012  98,342  23,072  95,772  2,892
Commercial real estate - investor  101,704  117,469  25,001  107,153  3,552
Real estate construction  30,100  38,680  9,185  35,411  1,220
 Commercial real estate lending  131,804  156,149  34,186  142,564  4,772
  Total commercial  217,816  254,491  57,258  238,336  7,664
Home equity  52,756  58,221  30,836  56,069  1,909
Installment  3,730  4,059  2,021  4,135  217
 Total retail  56,486  62,280  32,857  60,204  2,126
 Residential mortgage  74,415  81,215  14,664  77,987  2,197
  Total consumer  130,901  143,495  47,521  138,191  4,323
   Total loans$ 348,717$ 397,986$ 104,779$ 376,527$ 11,987
              
Loans with no related allowance           
Commercial and industrial$ 21,247$ 27,631$ -$ 23,514$ 532
Commercial real estate - owner occupied  16,400  20,426  -  18,609  200
Lease financing  9,468  9,468  -  11,436  -
 Commercial and business lending  47,115  57,525  -  53,559  732
Commercial real estate - investor  41,065  63,872  -  50,936  242
Real estate construction  22,683  41,636  -  30,937  330
 Commercial real estate lending  63,748  105,508  -  81,873  572
  Total commercial  110,863  163,033  -  135,432  1,304
Home equity  3,101  5,087  -  3,314  6
Installment  -  -  -  -  -
 Total retail  3,101  5,087  -  3,314  6
 Residential mortgage  7,255  7,806  -  7,376  117
  Total consumer  10,356  12,893  -  10,690  123
   Total loans$ 121,219$ 175,926$ -$ 146,122$ 1,427
              
Total          
Commercial and industrial$ 78,627$ 93,576$ 15,307$ 88,556$ 2,797
Commercial real estate - owner occupied  43,856  51,647  7,570  47,547  787
Lease financing  10,644  10,644  195  13,228  40
 Commercial and business lending  133,127  155,867  23,072  149,331  3,624
Commercial real estate - investor  142,769  181,341  25,001  158,089  3,794
Real estate construction  52,783  80,316  9,185  66,348  1,550
 Commercial real estate lending  195,552  261,657  34,186  224,437  5,344
  Total commercial  328,679  417,524  57,258  373,768  8,968
Home equity  55,857  63,308  30,836  59,383  1,915
Installment  3,730  4,059  2,021  4,135  217
 Total retail  59,587  67,367  32,857  63,518  2,132
 Residential mortgage  81,670  89,021  14,664  85,363  2,314
  Total consumer  141,257  156,388  47,521  148,881  4,446
   Total loans$ 469,936$ 573,912$ 104,779$ 522,649$ 13,414
              
*Interest income recognized included $6 million of interest income recognized on accruing restructured loans for the year ended December 31, 2011.
Nonaccrual and Performing Restructured Loans
  December 31, 2012 December 31, 2011 
  Performing Restructured Loans Nonaccrual Restructured Loans * Performing Restructured Loans Nonaccrual Restructured Loans * 
  ($ in Thousands) 
Commercial and industrial$ 28,140$ 12,496$ 22,552$ 12,211 
Commercial real estate - owner occupied  13,852  11,514  8,138  9,706 
Commercial real estate - investor  41,660  25,221  43,417  30,303 
Real estate construction   4,530  6,798  10,977  14,253 
Home equity  9,968  6,698  8,950  6,268 
Installment  653  674  1,015  1,163 
Residential mortgage  22,284  17,189  18,115  13,589 
 $ 121,087$ 80,590$ 113,164$ 87,493 
          
* Nonaccrual restructured loans have been included within nonaccrual loans.   
Summary of Restructured Loans
  Year Ended December 31, 2012 Year Ended December 31, 2011
  Number of Loans Recorded Investment (1) Unpaid Principal Balance (2) Number of Loans Recorded Investment (1) Unpaid Principal Balance (2)
  ($ in Thousands)
Commercial and industrial  85$ 12,827$ 15,834  104$ 31,933$ 36,844
Commercial real estate - owner occupied  27  11,978  12,766  22  15,841  19,741
Commercial real estate - investor  25  12,379  13,569  59  42,721  54,132
Real estate construction   31  2,955  3,549  33  18,308  23,802
Home equity  111  4,870  6,143  57  4,886  5,428
Installment  13  298  302  19  1,004  1,048
Residential mortgage  121  14,292  16,787  42  6,113  8,087
   413$ 59,599$ 68,950  336$ 120,806$ 149,082
             
(1) Represents post-modification outstanding recorded investment.      
(2) Represents pre-modification outstanding recorded investment.      
Troubled debt restructurings subsequent redefault
  Year Ended December 31, 2012 Year Ended December 31, 2011
  Number of Loans Recorded Investment Number of Loans Recorded Investment
  ($ in Thousands)
Commercial and industrial 16$ 1,736 26$ 2,880
Commercial real estate - owner occupied 10  4,729 6  2,094
Commercial real estate - investor 13  10,854 16  9,546
Real estate construction  5  1,695 10  2,846
Home equity 14  2,049 12  1,422
Installment 1  12 1  20
Residential mortgage 10  1,499 10  1,714
  69$ 22,574 81$ 20,522
         
Loans receivable related parties
  2012 
   ($ in Thousands) 
Balance at beginning of year$37,751 
New loans 15,010 
Repayments (14,610) 
Changes due to status of executive officers and directors (1,180) 
Balance at end of year$36,971 
Commercial Loan [Member]
  
Financing Receivable, Impaired [Line Items]  
Commercial and Consumer loans by credit quality indicator
The following table presents commercial loans by credit quality indicator at December 31, 2012.
             
    Pass Special Mention Potential Problem Impaired Total
    ($ Thousands)
Commercial and industrial$ 4,208,478$ 97,787  128,434$ 67,322$ 4,502,021
Commercial real estate - owner occupied  1,030,632  51,417  99,592  38,106  1,219,747
Lease financing  58,099  2,802  264  3,031  64,196
 Commercial and business lending  5,297,209  152,006  228,290  108,459  5,785,964
Commercial real estate - investor  2,634,035  65,309  107,068  100,347  2,906,759
Real estate construction  603,481  6,976  13,092  31,832  655,381
 Commercial real estate lending  3,237,516  72,285  120,160  132,179  3,562,140
  Total commercial$ 8,534,725$ 224,291$ 348,450$ 240,638$ 9,348,104
             
The following table presents commercial loans by credit quality indicator at December 31, 2011.
             
    Pass Special Mention Potential Problem Impaired Total
    ($ Thousands)
Commercial and industrial$ 3,283,090$ 209,713  153,306$ 78,627$ 3,724,736
Commercial real estate - owner occupied  853,517  53,090  136,366  43,856  1,086,829
Lease financing  46,570  822  158  10,644  58,194
 Commercial and business lending  4,183,177  263,625  289,830  133,127  4,869,759
Commercial real estate - investor  2,055,124  135,668  230,206  142,769  2,563,767
Real estate construction  494,839  8,775  27,649  52,783  584,046
 Commercial real estate lending  2,549,963  144,443  257,855  195,552  3,147,813
  Total commercial$ 6,733,140$ 408,068$ 547,685$ 328,679$ 8,017,572
Consumer Loan [Member]
  
Financing Receivable, Impaired [Line Items]  
Commercial and Consumer loans by credit quality indicator
The following table presents consumer loans by credit quality indicator at December 31, 2012.
             
    Performing 30-89 Days Past Due Potential Problem Impaired Total
    ($ Thousands)
Home equity$ 2,153,103$ 13,538  3,670$ 49,183$ 2,219,494
Installment  462,016  2,109  111  2,491  466,727
 Total retail  2,615,119  15,647  3,781  51,674  2,686,221
Residential mortgage  3,276,889  9,403  8,762  81,643  3,376,697
 Total consumer$ 5,892,008$ 25,050$ 12,543$ 133,317$ 6,062,918
             
The following table presents consumer loans by credit quality indicator at December 31, 2011.
             
    Performing 30-89 Days Past Due Potential Problem Impaired Total
    ($ Thousands)
Home equity$ 2,431,207$ 12,189  5,451$ 55,857$ 2,504,704
Installment  551,227  2,592  233  3,730  557,782
 Total retail  2,982,434  14,781  5,684  59,587  3,062,486
Residential mortgage  2,849,082  7,224  13,037  81,670  2,951,013
 Total consumer$ 5,831,516$ 22,005$ 18,721$ 141,257$ 6,013,499