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Loans, Allowance for Loan Losses, and Credit Quality (Tables)
 6 Months Ended
Jun. 30, 2013
Financing Receivable, Impaired [Line Items]  
Loan composition
The period end loan composition was as follows.
          
     June 30,  December 31, 
     2013  2012 
     ($ in Thousands) 
Commercial and industrial$ 4,752,838 $ 4,502,021 
Commercial real estate - owner occupied  1,174,866   1,219,747 
Lease financing  55,084   64,196 
 Commercial and business lending  5,982,788   5,785,964 
Commercial real estate - investor  3,010,992   2,906,759 
Real estate construction  800,569   655,381 
 Commercial real estate lending  3,811,561   3,562,140 
  Total commercial  9,794,349   9,348,104 
Home equity  1,986,233   2,219,494 
Installment  434,029   466,727 
Residential mortgage  3,531,988   3,376,697 
  Total consumer  5,952,250   6,062,918 
   Total loans$ 15,746,599 $ 15,411,022 
Changes in the allowance for loan losses
A summary of the changes in the allowance for loan losses was as follows.
        
   June 30,  December 31, 
   2013  2012 
   ($ in Thousands) 
Balance at beginning of period$297,409 $378,151 
Provision for loan losses 8,000  3,000 
Charge offs (49,032)  (117,046) 
Recoveries 20,841  33,304 
 Net charge offs (28,191)  (83,742) 
Balance at end of period$277,218 $297,409 
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 six months ended June 30, 2013, was as follows.
                   
$ in ThousandsCommercial and industrialCommercial real estate - owner occupiedLease financingCommercial real estate - investorReal estate constructionHome equityInstallmentResidential mortgage Total
         
Balance at Dec 31, 2012$ 97,852$ 27,389$ 3,024$ 63,181$ 20,741$ 56,826$ 4,299$ 24,097$ 297,409
Provision for loan losses  12,848  (3,226)  (306)  3,276  3,289  (12,422)  (995)  5,536  8,000
Charge offs  (14,610)  (3,271)  (206)  (7,117)  (2,419)  (13,547)  (745)  (7,117)  (49,032)
Recoveries  12,437  179  202  3,955  1,122  1,710  502  734  20,841
Balance at Jun 30, 2013$ 108,527$ 21,071$ 2,714$ 63,295$ 22,733$ 32,567$ 3,061$ 23,250$ 277,218
                   
Allowance for loan losses:          
Ending balance impaired loans individually evaluated for impairment$ 4,783$ 576$ - $ 3,205$ 315$ 138$ - $ 336$ 9,353
Ending balance impaired loans collectively evaluated for impairment$ 6,240$ 2,535$ 3$ 4,591$ 2,824$ 14,418$ 735$ 12,125$ 43,471
Total impaired loans$ 11,023$ 3,111$ 3$ 7,796$ 3,139$ 14,556$ 735$ 12,461$ 52,824
Ending balance all other loans collectively evaluated for impairment$ 97,504$ 17,960$ 2,711$ 55,499$ 19,594$ 18,011$ 2,326$ 10,789$ 224,394
Total$ 108,527$ 21,071$ 2,714$ 63,295$ 22,733$ 32,567$ 3,061$ 23,250$ 277,218
                   
Loans:                  
Ending balance impaired loans individually evaluated for impairment$ 18,030$ 17,821$ - $ 53,508$ 17,222$ 1,052$ - $ 9,880$ 117,513
Ending balance impaired loans collectively evaluated for impairment$ 43,242$ 20,518$ 72$ 44,571$ 9,562$ 37,015$ 2,103$ 61,963$ 219,046
Total impaired loans$ 61,272$ 38,339$ 72$ 98,079$ 26,784$ 38,067$ 2,103$ 71,843$ 336,559
Ending balance all other loans collectively evaluated for impairment$ 4,691,566$ 1,136,527$ 55,012$ 2,912,913$ 773,785$ 1,948,166$ 431,926$ 3,460,145$ 15,410,040
Total$ 4,752,838$ 1,174,866$ 55,084$ 3,010,992$ 800,569$ 1,986,233$ 434,029$ 3,531,988$ 15,746,599

For comparison purposes, 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
Total impaired loans$ 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
Summarized details of Loans
The following table presents loans by past due status at June 30, 2013.
             
  30-59 Days Past Due 60-89 Days Past Due90 Days or More Past Due *Total Past Due Current Total
 ($ in Thousands)
Accruing loans            
Commercial and industrial$ 3,718$ 4,798$ 147$ 8,663$ 4,713,873$ 4,722,536
Commercial real estate - owner occupied  1,462  6,643  -   8,105  1,142,758  1,150,863
Lease financing  57  -   -   57  54,955  55,012
Commercial and business lending  5,237  11,441  147  16,825  5,911,586  5,928,411
Commercial real estate - investor  3,797  14,472  622  18,891  2,931,321  2,950,212
Real estate construction  541  256  -   797  778,353  779,150
Commercial real estate lending  4,338  14,728  622  19,688  3,709,674  3,729,362
Total commercial  9,575  26,169  769  36,513  9,621,260  9,657,773
Home equity  9,871  2,434  -   12,305  1,945,794  1,958,099
Installment  1,066  368  779  2,213  430,283  432,496
Residential mortgage  8,756  1,164  -   9,920  3,470,818  3,480,738
Total consumer  19,693  3,966  779  24,438  5,846,895  5,871,333
Total accruing loans$ 29,268$ 30,135$ 1,548$ 60,951$ 15,468,155$ 15,529,106
             
Nonaccrual loans            
Commercial and industrial$ 2,887$ 3,098$ 11,560$ 17,545$ 12,757$ 30,302
Commercial real estate - owner occupied  1,148  1,037  7,552  9,737  14,266  24,003
Lease financing  -   -   72  72  -   72
Commercial and business lending  4,035  4,135  19,184  27,354  27,023  54,377
Commercial real estate - investor  5,120  1,658  37,590  44,368  16,412  60,780
Real estate construction  -   2,567  5,978  8,545  12,874  21,419
Commercial real estate lending  5,120  4,225  43,568  52,913  29,286  82,199
Total commercial  9,155  8,360  62,752  80,267  56,309  136,576
Home equity  1,721  1,572  16,974  20,267  7,867  28,134
Installment  122  113  417  652  881  1,533
Residential mortgage  3,045  4,222  30,854  38,121  13,129  51,250
Total consumer  4,888  5,907  48,245  59,040  21,877  80,917
Total nonaccrual loans$ 14,043$ 14,267$ 110,997$ 139,307$ 78,186$ 217,493
             
Total loans            
Commercial and industrial$ 6,605$ 7,896$ 11,707$ 26,208$ 4,726,630$ 4,752,838
Commercial real estate - owner occupied  2,610  7,680  7,552  17,842  1,157,024  1,174,866
Lease financing  57  -   72  129  54,955  55,084
Commercial and business lending  9,272  15,576  19,331  44,179  5,938,609  5,982,788
Commercial real estate - investor  8,917  16,130  38,212  63,259  2,947,733  3,010,992
Real estate construction  541  2,823  5,978  9,342  791,227  800,569
Commercial real estate lending  9,458  18,953  44,190  72,601  3,738,960  3,811,561
Total commercial  18,730  34,529  63,521  116,780  9,677,569  9,794,349
Home equity  11,592  4,006  16,974  32,572  1,953,661  1,986,233
Installment  1,188  481  1,196  2,865  431,164  434,029
Residential mortgage  11,801  5,386  30,854  48,041  3,483,947  3,531,988
Total consumer  24,581  9,873  49,024  83,478  5,868,772  5,952,250
Total loans$ 43,311$ 44,402$ 112,545$ 200,258$ 15,546,341$ 15,746,599
             
* The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at June 30, 2013 (the same as the reported balances for the accruing loans noted above).

The following table presents loans by past due status at December 31, 2012.
             
  30-59 Days Past Due 60-89 Days Past Due90 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
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
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
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).
Summarized details of impaired Loans
The following table presents impaired loans at June 30, 2013.
           
  Recorded Investment Unpaid Principal Balance Related Allowance  YTD Average Recorded Investment YTD Interest Income Recognized*
Loans with a related allowance  ($ in Thousands)
Commercial and industrial$ 54,100$ 63,331$ 11,023$ 57,272$ 827
Commercial real estate - owner occupied  23,890  26,742  3,111  25,362  440
Lease financing  72  72  3  99  -
Commercial and business lending  78,062  90,145  14,137  82,733  1,267
Commercial real estate - investor  67,040  78,864  7,796  68,667  1,052
Real estate construction  11,956  16,376  3,139  12,565  156
Commercial real estate lending  78,996  95,240  10,935  81,232  1,208
Total commercial  157,058  185,385  25,072  163,965  2,475
Home equity  37,770  44,686  14,556  39,376  709
Installment  2,103  2,482  735  2,226  57
Residential mortgage  63,961  75,150  12,461  65,713  856
Total consumer  103,834  122,318  27,752  107,315  1,622
Total loans$ 260,892$ 307,703$ 52,824$ 271,280$ 4,097
           
Loans with no related allowance           
Commercial and industrial$ 7,172$ 14,060$ -$ 8,259$ 41
Commercial real estate - owner occupied  14,449  16,862  -  14,694  45
Commercial and business lending  21,621  30,922  -  22,953  86
Commercial real estate - investor  31,039  43,825  -  33,716  124
Real estate construction  14,828  20,718  -  15,249  -
Commercial real estate lending  45,867  64,543  -  48,965  124
Total commercial  67,488  95,465  -  71,918  210
Home equity  297  333  -  322  3
Installment  -  -  -  -  -
Residential mortgage  7,882  9,602  -  7,870  112
Total consumer  8,179  9,935  -  8,192  115
Total loans$ 75,667$ 105,400$ -$ 80,110$ 325
           
Total          
Commercial and industrial$ 61,272$ 77,391$ 11,023$ 65,531$ 868
Commercial real estate - owner occupied  38,339  43,604  3,111  40,056  485
Lease financing  72  72  3  99  -
Commercial and business lending  99,683  121,067  14,137  105,686  1,353
Commercial real estate - investor  98,079  122,689  7,796  102,383  1,176
Real estate construction  26,784  37,094  3,139  27,814  156
Commercial real estate lending  124,863  159,783  10,935  130,197  1,332
Total commercial  224,546  280,850  25,072  235,883  2,685
Home equity  38,067  45,019  14,556  39,698  712
Installment  2,103  2,482  735  2,226  57
Residential mortgage  71,843  84,752  12,461  73,583  968
Total consumer  112,013  132,253  27,752  115,507  1,737
Total loans$ 336,559$ 413,103$ 52,824$ 351,390$ 4,422
           
*Interest income recognized included $3 million of interest income recognized on accruing restructured loans for the six months ended June 30, 2013.

The following table presents impaired loans at December 31, 2012.
           
  Recorded Investment Unpaid Principal Balance Related Allowance YTD Average Recorded Investment YTD 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
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  -  -  -  -  -
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
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 $6 million of interest income recognized on accruing restructured loans for the year ended December 31, 2012.
Nonaccrual and Performing Restructured Loans
  June 30, 2013 December 31, 2012 
  Performing Restructured Loans Nonaccrual Restructured Loans * Performing Restructured Loans Nonaccrual Restructured Loans * 
  ($ in Thousands)
Commercial and industrial$ 30,970$ 10,166$ 28,140$ 12,496 
Commercial real estate - owner occupied  14,336  11,644  13,852  11,514 
Commercial real estate - investor  37,299  20,540  41,660  25,221 
Real estate construction   5,365  5,168  4,530  6,798 
Home equity  9,933  6,529  9,968  6,698 
Installment  570  603  653  674 
Residential mortgage  20,593  15,704  22,284  17,189 
Total $ 119,066$ 70,354$ 121,087$ 80,590 
          
* Nonaccrual restructured loans have been included with nonaccrual loans.   
Summary of Restructured Loans
The following table provides the number of loans modified in a troubled debt restructuring by loan portfolio during the three and six months ended June 30, 2013, and the recorded investment and unpaid principal balance as of June 30, 2013.
             
  Three Months Ended June 30, 2013 Six Months Ended June 30, 2013
  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  25$ 4,323$ 4,414  43$ 6,401$ 8,074
Commercial real estate - owner occupied  7  4,086  4,194  10  6,270  6,388
Commercial real estate - investor  3  1,801  1,948  8  3,822  4,029
Real estate construction   2  51  80  7  2,004  2,057
Home equity  29  2,114  2,640  62  3,580  4,192
Installment  1  34  34  2  199  202
Residential mortgage  26  3,482  3,879  56  5,365  6,072
Total  93$ 15,891$ 17,189  188$ 27,641$ 31,014
             
(1) Represents post-modification outstanding recorded investment.      
(2) Represents pre-modification outstanding recorded investment.      

The following table provides the number of loans modified in a troubled debt restructuring by loan portfolio during the three and six months ended June 30, 2012, and the recorded investment and unpaid principal balance as of June 30, 2012.
             
  Three Months Ended June 30, 2012 Six Months Ended June 30, 2012
  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  19$ 5,525$ 9,342  63$ 13,297$ 17,961
Commercial real estate - owner occupied  10  2,753  2,857  19  6,158  6,717
Commercial real estate - investor  18  7,526  7,964  26  10,302  10,751
Real estate construction   3  388  392  6  1,138  1,475
Home equity  8  311  320  22  939  954
Installment  3  87  87  6  118  118
Residential mortgage  5  660  683  13  2,768  2,872
Total  66$ 17,250$ 21,645  155$ 34,720$ 40,848
             
(1) Represents post-modification outstanding recorded investment.      
(2) Represents pre-modification outstanding recorded investment.      
Troubled debt restructurings subsequent redefault
  Three Months Ended June 30, 2013 Six Months Ended June 30, 2013
  Number of LoansRecorded InvestmentNumber of Loans Recorded Investment
  ($ in Thousands)
Commercial and industrial 15$ 711 22$ 1,798
Commercial real estate - owner occupied 2  43 3  115
Commercial real estate - investor 2  82 5  1,598
Real estate construction  2  41 2  41
Home equity 10  633 13  740
Residential mortgage 7  952 10  1,405
Total 38$ 2,462 55$ 5,697

  Three Months Ended June 30, 2012 Six Months Ended June 30, 2012
  Number of LoansRecorded InvestmentNumber of Loans Recorded Investment
  ($ in Thousands)
Commercial and industrial 9$ 1,157 15$ 1,981
Commercial real estate - investor 9  5,770 13  7,053
Real estate construction  5  1,830 6  1,848
Home equity 4  254 6  314
Installment 2  334 2  333
Residential mortgage 6  584 6  584
Total 35$ 9,929 48$ 12,113
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 June 30, 2013.
           
  Pass Special Mention Potential Problem Impaired Total
  ($ in Thousands)
Commercial and industrial$ 4,459,010$ 105,174$ 127,382$ 61,272$ 4,752,838
Commercial real estate - owner occupied  997,132  64,321  75,074  38,339  1,174,866
Lease financing  54,222  511  279  72  55,084
Commercial and business lending  5,510,364  170,006  202,735  99,683  5,982,788
Commercial real estate - investor  2,773,560  50,011  89,342  98,079  3,010,992
Real estate construction  761,487  3,114  9,184  26,784  800,569
Commercial real estate lending  3,535,047  53,125  98,526  124,863  3,811,561
Total commercial$ 9,045,411$ 223,131$ 301,261$ 224,546$ 9,794,349
           
The following table presents commercial loans by credit quality indicator at December 31, 2012.
           
  Pass Special Mention Potential Problem Impaired Total
  ($ in 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
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 June 30, 2013.
           
  Performing 30-89 Days Past Due Potential Problem Impaired Total
  ($ in Thousands)
Home equity$ 1,933,246$ 12,305$ 2,615$ 38,067$ 1,986,233
Installment  430,409  1,434  83  2,103  434,029
Residential mortgage  3,444,308  9,920  5,917  71,843  3,531,988
Total consumer$ 5,807,963$ 23,659$ 8,615$ 112,013$ 5,952,250
           
The following table presents consumer loans by credit quality indicator at December 31, 2012.
           
  Performing 30-89 Days Past Due Potential Problem Impaired Total
  ($ in 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
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