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Loans, Allowance for Loan Losses, and Credit Quality (Tables)
 12 Months Ended
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]  
Loan composition
    20142013 
    ($ in Thousands) 
Commercial and industrial$5,905,902$4,822,680 
Commercial real estate - owner occupied 1,007,937 1,114,715 
Lease financing 51,529 55,483 
 Commercial and business lending 6,965,368 5,992,878 
Commercial real estate - investor 3,056,485 2,939,456 
Real estate construction 1,008,956 896,248 
 Commercial real estate lending 4,065,441 3,835,704 
  Total commercial 11,030,809 9,828,582 
Home equity 1,636,058 1,825,014 
Installment and credit cards 454,219 407,074 
Residential mortgage 4,472,760 3,835,591 
  Total consumer 6,563,037 6,067,679 
   Total loans$17,593,846$15,896,261 
Changes in the allowance for loan losses
A summary of the changes in the allowance for credit losses for the years indicated was as follows.
         
  201420132012 
  ($ in Thousands) 
Allowance for Loan Losses:       
Balance at beginning of year$268,315$297,409$378,151 
Provision for loan losses 13,000 10,000 3,000 
Charge offs (44,096) (88,061) (117,046) 
Recoveries 29,083 48,967 33,304 
 Net charge offs (15,013) (39,094) (83,742) 
Balance at end of year$266,302$268,315$297,409 
Allowance for Unfunded Commitments:       
Balance at beginning of year$21,900$21,800$14,700 
Provision for unfunded commitments 3,000 100 7,100 
Balance at end of year$24,900$21,900$21,800 
Allowance for Credit Losses$291,202$290,215$319,209 
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, 2014, was as follows.
                   
$ in ThousandsCommercial and industrialCommercial real estate - owner occupiedLease financingCommercial real estate- investorReal estate constructionHome equityInstallment and credit cardsResidential mortgage Total
Balance at Dec 31, 2013$ 104,501$ 19,476$ 1,607$ 58,156$ 23,418$ 32,196$ 2,416$ 26,545$ 268,315
Provision for loan losses  14,767  (1,296)  35  (17,290)  (1,277)  7,087  6,279  4,695  13,000
Charge offs  (14,633)  (3,476)  (39)  (4,529)  (1,958)  (12,332)  (2,876)  (4,253)  (44,096)
Recoveries  11,390  1,806  7  9,996  816  3,408  616  1,044  29,083
Balance at Dec 31, 2014$ 116,025$ 16,510$ 1,610$ 46,333$ 20,999$ 30,359$ 6,435$ 28,031$ 266,302
                   
Allowance for loan losses:              
Ending balance impaired loans individually evaluated for impairment$ 13,615$ 1,490$ 574$ 1,649$ 328$ 11$ -$ 199$ 17,866
Ending balance impaired loans collectively evaluated for impairment$ 2,852$ 1,731$ -$ 1,938$ 767$ 13,004$ 308$ 11,965$ 32,565
Total impaired loans$ 16,467$ 3,221$ 574$ 3,587$ 1,095$ 13,015$ 308$ 12,164$ 50,431
Ending balance all other loans collectively evaluated for impairment$ 99,558$ 13,289$ 1,036$ 42,746$ 19,904$ 17,344$ 6,127$ 15,867$ 215,871
Total$ 116,025$ 16,510$ 1,610$ 46,333$ 20,999$ 30,359$ 6,435$ 28,031$ 266,302
                   
Loans:                  
Ending balance impaired loans individually evaluated for impairment$ 45,118$ 20,731$ 1,801$ 19,683$ 3,776$ 962$ -$ 9,751$ 101,822
Ending balance impaired loans collectively evaluated for impairment$ 38,437$ 15,548$ -$ 26,129$ 2,350$ 30,845$ 1,587$ 58,911$ 173,807
Total impaired loans$ 83,555$ 36,279$ 1,801$ 45,812$ 6,126$ 31,807$ 1,587$ 68,662$ 275,629
Ending balance all other loans collectively evaluated for impairment$ 5,822,347$ 971,658$ 49,728$ 3,010,673$ 1,002,830$ 1,604,251$ 452,632$ 4,404,098$ 17,318,217
Total$ 5,905,902$ 1,007,937$ 51,529$ 3,056,485$ 1,008,956$ 1,636,058$ 454,219$ 4,472,760$ 17,593,846

For comparison purposes, a summary of the changes in the allowance for loan losses by portfolio segment for the year ended December 31, 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  12,930  (1,778)  (1,429)  (2,140)  541  (8,213)  (2,127)  12,216  10,000
Charge offs  (35,146)  (6,474)  (206)  (9,846)  (3,375)  (20,629)  (1,389)  (10,996)  (88,061)
Recoveries  28,865  339  218  6,961  5,511  4,212  1,633  1,228  48,967
Balance at Dec 31, 2013$ 104,501$ 19,476$ 1,607$ 58,156$ 23,418$ 32,196$ 2,416$ 26,545$ 268,315
                   
Allowance for loan losses:              
Ending balance impaired loans individually evaluated for impairment$ 7,994$ 1,019$ -$ 3,932$ 254$ 123$ -$ 315$ 13,637
Ending balance impaired loans collectively evaluated for impairment$ 3,923$ 1,936$ 29$ 3,963$ 2,162$ 13,866$ 487$ 11,872$ 38,238
Total impaired loans$ 11,917$ 2,955$ 29$ 7,895$ 2,416$ 13,989$ 487$ 12,187$ 51,875
Ending balance all other loans collectively evaluated for impairment$ 92,584$ 16,521$ 1,578$ 50,261$ 21,002$ 18,207$ 1,929$ 14,358$ 216,440
Total$ 104,501$ 19,476$ 1,607$ 58,156$ 23,418$ 32,196$ 2,416$ 26,545$ 268,315
                   
Loans:                  
Ending balance impaired loans individually evaluated for impairment$ 29,343$ 24,744$ -$ 32,367$ 3,777$ 929$ -$ 10,526$ 101,686
Ending balance impaired loans collectively evaluated for impairment$ 40,893$ 17,929$ 69$ 50,175$ 6,483$ 33,871$ 1,360$ 56,947$ 207,727
Total impaired loans$ 70,236$ 42,673$ 69$ 82,542$ 10,260$ 34,800$ 1,360$ 67,473$ 309,413
Ending balance all other loans collectively evaluated for impairment$ 4,752,444$ 1,072,042$ 55,414$ 2,856,914$ 885,988$ 1,790,214$ 405,714$ 3,768,118$ 15,586,848
Total$ 4,822,680$ 1,114,715$ 55,483$ 2,939,456$ 896,248$ 1,825,014$ 407,074$ 3,835,591$ 15,896,261
Summarized details of Loans
The following table presents loans by past due status at December 31, 2014.
                
     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$ 4,466$ 10,281$ 254$ 15,001$ 5,841,238$ 5,856,239
Commercial real estate - owner occupied  8,429  2,199  -  10,628  971,484  982,112
Lease financing  -  -  -  -  49,728  49,728
 Commercial and business lending  12,895  12,480  254  25,629  6,862,450  6,888,079
Commercial real estate - investor  712  496  -  1,208  3,032,592  3,033,800
Real estate construction  951  33  -  984  1,002,573  1,003,557
 Commercial real estate lending  1,663  529  -  2,192  4,035,165  4,037,357
  Total commercial  14,558  13,009  254  27,821  10,897,615  10,925,436
Home equity  8,037  2,546  52  10,635  1,603,682  1,614,317
Installment and credit cards  1,186  746  1,317  3,249  450,357  453,606
Residential mortgage  2,840  206  -  3,046  4,420,028  4,423,074
  Total consumer  12,063  3,498  1,369  16,930  6,474,067  6,490,997
   Total accruing loans$ 26,621$ 16,507$ 1,623$ 44,751$ 17,371,682$ 17,416,433
                
Nonaccrual loans            
Commercial and industrial$ 872$ 627$ 10,154$ 11,653$ 38,010$ 49,663
Commercial real estate - owner occupied  3,197  41  8,596  11,834  13,991  25,825
Lease financing  -  -  513  513  1,288  1,801
 Commercial and business lending  4,069  668  19,263  24,000  53,289  77,289
Commercial real estate - investor  1,857  459  12,765  15,081  7,604  22,685
Real estate construction  87  73  798  958  4,441  5,399
 Commercial real estate lending  1,944  532  13,563  16,039  12,045  28,084
  Total commercial  6,013  1,200  32,826  40,039  65,334  105,373
Home equity  1,615  2,306  10,602  14,523  7,218  21,741
Installment and credit cards  96  39  141  276  337  613
Residential mortgage  5,028  2,653  19,730  27,411  22,275  49,686
  Total consumer  6,739  4,998  30,473  42,210  29,830  72,040
   Total nonaccrual loans **$ 12,752$ 6,198$ 63,299$ 82,249$ 95,164$ 177,413
                
Total loans            
Commercial and industrial$ 5,338$ 10,908$ 10,408$ 26,654$ 5,879,248$ 5,905,902
Commercial real estate - owner occupied  11,626  2,240  8,596  22,462  985,475  1,007,937
Lease financing  -  -  513  513  51,016  51,529
 Commercial and business lending  16,964  13,148  19,517  49,629  6,915,739  6,965,368
Commercial real estate - investor  2,569  955  12,765  16,289  3,040,196  3,056,485
Real estate construction  1,038  106  798  1,942  1,007,014  1,008,956
 Commercial real estate lending  3,607  1,061  13,563  18,231  4,047,210  4,065,441
  Total commercial  20,571  14,209  33,080  67,860  10,962,949  11,030,809
Home equity  9,652  4,852  10,654  25,158  1,610,900  1,636,058
Installment and credit cards  1,282  785  1,458  3,525  450,694  454,219
Residential mortgage  7,868  2,859  19,730  30,457  4,442,303  4,472,760
  Total consumer  18,802  8,496  31,842  59,140  6,503,897  6,563,037
   Total loans$ 39,373$ 22,705$ 64,922$ 127,000$ 17,466,846$ 17,593,846
                
* The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at December 31, 2014 (the same as the reported balances for the accruing loans noted above).
** The percent of nonaccrual loans which are current was 54% at December 31, 2014.

The following table presents loans by past due status at December 31, 2013.
                
     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$ 3,390$ 3,436$ 1,199$ 8,025$ 4,776,936$ 4,784,961
Commercial real estate - owner occupied  1,015  2,091  -  3,106  1,081,945  1,085,051
Lease financing  -  -  -  -  55,414  55,414
 Commercial and business lending  4,405  5,527  1,199  11,131  5,914,295  5,925,426
Commercial real estate - investor  9,081  14,134  -  23,215  2,878,645  2,901,860
Real estate construction  836  1,118  -  1,954  887,827  889,781
 Commercial real estate lending  9,917  15,252  -  25,169  3,766,472  3,791,641
  Total commercial  14,322  20,779  1,199  36,300  9,680,767  9,717,067
Home equity  8,611  2,069  346  11,026  1,788,821  1,799,847
Installment  885  265  637  1,787  404,173  405,960
Residential mortgage  5,253  865  168  6,286  3,781,673  3,787,959
  Total consumer  14,749  3,199  1,151  19,099  5,974,667  5,993,766
   Total accruing loans$ 29,071$ 23,978$ 2,350$ 55,399$ 15,655,434$ 15,710,833
                
Nonaccrual loans            
Commercial and industrial$ 998$ 1,764$ 9,765$ 12,527$ 25,192$ 37,719
Commercial real estate - owner occupied  2,482  1,724  11,125  15,331  14,333  29,664
Lease financing  -  -  69  69  -  69
 Commercial and business lending  3,480  3,488  20,959  27,927  39,525  67,452
Commercial real estate - investor  3,408  899  20,466  24,773  12,823  37,596
Real estate construction  2,376  -  2,267  4,643  1,824  6,467
 Commercial real estate lending  5,784  899  22,733  29,416  14,647  44,063
  Total commercial  9,264  4,387  43,692  57,343  54,172  111,515
Home equity  1,725  1,635  14,331  17,691  7,476  25,167
Installment  129  24  289  442  672  1,114
Residential mortgage  3,199  3,257  26,201  32,657  14,975  47,632
  Total consumer  5,053  4,916  40,821  50,790  23,123  73,913
   Total nonaccrual loans **$ 14,317$ 9,303$ 84,513$ 108,133$ 77,295$ 185,428
                
Total loans            
Commercial and industrial$ 4,388$ 5,200$ 10,964$ 20,552$ 4,802,128$ 4,822,680
Commercial real estate - owner occupied  3,497  3,815  11,125  18,437  1,096,278  1,114,715
Lease financing  -  -  69  69  55,414  55,483
 Commercial and business lending  7,885  9,015  22,158  39,058  5,953,820  5,992,878
Commercial real estate - investor  12,489  15,033  20,466  47,988  2,891,468  2,939,456
Real estate construction  3,212  1,118  2,267  6,597  889,651  896,248
 Commercial real estate lending  15,701  16,151  22,733  54,585  3,781,119  3,835,704
  Total commercial  23,586  25,166  44,891  93,643  9,734,939  9,828,582
Home equity  10,336  3,704  14,677  28,717  1,796,297  1,825,014
Installment  1,014  289  926  2,229  404,845  407,074
Residential mortgage  8,452  4,122  26,369  38,943  3,796,648  3,835,591
  Total consumer  19,802  8,115  41,972  69,889  5,997,790  6,067,679
   Total loans$ 43,388$ 33,281$ 86,863$ 163,532$ 15,732,729$ 15,896,261
                
* The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at December 31, 2013 (the same as the reported balances for the accruing loans noted above).
** The percent of nonaccrual loans which are current was 42% at December 31, 2013.
Summarized details of impaired Loans
The following table presents impaired loans at December 31, 2014.
              
     Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized*
Loans with a related allowance  ($ in Thousands)
Commercial and industrial$ 76,433$ 80,414$ 16,467$ 80,004$ 3,139
Commercial real estate - owner occupied  19,839  21,807  3,221  20,878  681
Lease financing  1,801  1,801  574  2,009  -
 Commercial and business lending  98,073  104,022  20,262  102,891  3,820
Commercial real estate - investor  36,841  40,869  3,587  38,657  1,250
Real estate construction  3,043  5,910  1,095  3,818  105
 Commercial real estate lending  39,884  46,779  4,682  42,475  1,355
  Total commercial  137,957  150,801  24,944  145,366  5,175
Home equity  31,021  34,727  13,015  32,375  1,510
Installment and credit cards  1,587  1,795  308  1,736  58
Residential mortgage  61,601  65,863  12,164  62,742  2,054
  Total consumer  94,209  102,385  25,487  96,853  3,622
   Total loans$ 232,166$ 253,186$ 50,431$ 242,219$ 8,797
              
Loans with no related allowance           
Commercial and industrial$ 7,122$ 12,634$ -$ 8,851$ 82
Commercial real estate - owner occupied  16,440  19,019  -  17,970  219
Lease financing  -  -  -  -  -
 Commercial and business lending  23,562  31,653  -  26,821  301
Commercial real estate - investor  8,971  14,036  -  10,014  133
Real estate construction  3,083  3,815  -  3,241  -
 Commercial real estate lending  12,054  17,851  -  13,255  133
  Total commercial  35,616  49,504  -  40,076  434
Home equity  786  806  -  851  18
Installment and credit cards  -  -  -  -  -
Residential mortgage  7,061  7,315  -  7,224  135
  Total consumer  7,847  8,121  -  8,075  153
   Total loans$ 43,463$ 57,625$ -$ 48,151$ 587
              
Total          
Commercial and industrial$ 83,555$ 93,048$ 16,467$ 88,855$ 3,221
Commercial real estate - owner occupied  36,279  40,826  3,221  38,848  900
Lease financing  1,801  1,801  574  2,009  -
 Commercial and business lending  121,635  135,675  20,262  129,712  4,121
Commercial real estate - investor  45,812  54,905  3,587  48,671  1,383
Real estate construction  6,126  9,725  1,095  7,059  105
 Commercial real estate lending  51,938  64,630  4,682  55,730  1,488
  Total commercial  173,573  200,305  24,944  185,442  5,609
Home equity  31,807  35,533  13,015  33,226  1,528
Installment and credit cards  1,587  1,795  308  1,736  58
Residential mortgage  68,662  73,178  12,164  69,966  2,189
  Total consumer  102,056  110,506  25,487  104,928  3,775
   Total loans **$ 275,629$ 310,811$ 50,431$ 290,370$ 9,384
              
*Interest income recognized included $5 million of interest income recognized on accruing restructured loans for the year ended December 31, 2014.
** The implied fair value of all the impaired loans at December 31, 2014, was recorded as 72% of their unpaid principal balance. This fair value mark is calculated as the recorded investment, net of the related allowance, divided by the unpaid principal balance.

The following table presents impaired loans at December 31, 2013.
              
     Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized*
Loans with a related allowance  ($ in Thousands)
Commercial and industrial$ 57,857$ 65,443$ 11,917$ 61,000$ 1,741
Commercial real estate - owner occupied  22,651  25,072  2,955  24,549  995
Lease financing  69  69  29  76  -
 Commercial and business lending  80,577  90,584  14,901  85,625  2,736
Commercial real estate - investor  64,647  68,228  7,895  68,776  2,735
Real estate construction  8,815  12,535  2,416  9,796  236
 Commercial real estate lending  73,462  80,763  10,311  78,572  2,971
  Total commercial  154,039  171,347  25,212  164,197  5,707
Home equity  34,707  40,344  13,989  36,623  1,518
Installment  1,360  1,676  487  1,753  100
Residential mortgage  60,157  69,699  12,187  62,211  1,861
  Total consumer  96,224  111,719  26,663  100,587  3,479
   Total loans$ 250,263$ 283,066$ 51,875$ 264,784$ 9,186
              
Loans with no related allowance           
Commercial and industrial$ 12,379$ 19,556$ -$ 14,291$ 306
Commercial real estate - owner occupied  20,022  22,831  -  20,602  315
 Commercial and business lending  32,401  42,387  -  34,893  621
Commercial real estate - investor  17,895  25,449  -  19,354  130
Real estate construction  1,445  1,853  -  1,576  13
 Commercial real estate lending  19,340  27,302  -  20,930  143
  Total commercial  51,741  69,689  -  55,823  764
Home equity  93  92  -  94  2
Installment  -  -  -  -  -
Residential mortgage  7,316  8,847  -  7,321  185
  Total consumer  7,409  8,939  -  7,415  187
   Total loans$ 59,150$ 78,628$ -$ 63,238$ 951
              
Total          
Commercial and industrial$ 70,236$ 84,999$ 11,917$ 75,291$ 2,047
Commercial real estate - owner occupied  42,673  47,903  2,955  45,151  1,310
Lease financing  69  69  29  76  -
 Commercial and business lending  112,978  132,971  14,901  120,518  3,357
Commercial real estate - investor  82,542  93,677  7,895  88,130  2,865
Real estate construction  10,260  14,388  2,416  11,372  249
 Commercial real estate lending  92,802  108,065  10,311  99,502  3,114
  Total commercial  205,780  241,036  25,212  220,020  6,471
Home equity  34,800  40,436  13,989  36,717  1,520
Installment  1,360  1,676  487  1,753  100
Residential mortgage  67,473  78,546  12,187  69,532  2,046
  Total consumer  103,633  120,658  26,663  108,002  3,666
   Total loans **$ 309,413$ 361,694$ 51,875$ 328,022$ 10,137
              
*Interest income recognized included $6 million of interest income recognized on accruing restructured loans for the year ended December 31, 2013.
** The implied fair value of all the impaired loans at December 31, 2013, was recorded as 71% of their unpaid principal balance. This fair value mark is calculated as the recorded investment, net of the related allowance, divided by the unpaid principal balance.
Nonaccrual and Performing Restructured Loans
  December 31, 2014 December 31, 2013 December 31, 2012 
  Performing Restructured Loans Nonaccrual Restructured Loans * Performing Restructured Loans Nonaccrual Restructured Loans * Performing Restructured Loans Nonaccrual Restructured Loans * 
  ($ in Thousands) 
Commercial and industrial$ 33,892$ 3,260$ 32,517$ 6,900$ 28,140$ 12,496 
Commercial real estate - owner occupied  10,454  5,656  13,009  10,999  13,852  11,514 
Commercial real estate - investor  23,127  15,216  44,946  18,069  41,660  25,221 
Real estate construction   727  2,438  3,793  2,065  4,530  6,798 
Home equity  10,066  7,518  9,633  5,419  9,968  6,698 
Installment and credit cards  974  199  246  451  653  674 
Residential mortgage  18,976  23,369  19,841  15,682  22,284  17,189 
 $ 98,216$ 57,656$ 123,985$ 59,585$ 121,087$ 80,590 
              
* Nonaccrual restructured loans have been included within nonaccrual loans.   
Summary of Restructured Loans
  Year Ended December 31, 2014 Year Ended December 31, 2013 Year Ended December 31, 2012
  Number of Loans Recorded Investment (1) Unpaid Principal Balance (2) 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  15$ 7,681$ 7,711  48$ 11,833$ 14,543  85$ 12,827$ 15,834
Commercial real estate - owner occupied  4  1,465  1,625  12  8,823  9,035  27  11,978  12,766
Commercial real estate - investor  6  6,097  6,521  25  26,480  28,516  25  12,379  13,569
Real estate construction   2  15  15  9  1,822  1,961  31  2,955  3,549
Home equity  132  5,267  5,687  88  4,642  4,958  111  4,870  6,143
Installment and credit cards  2  24  26  3  193  200  13  298  302
Residential mortgage  148  18,321  19,075  93  10,259  12,106  121  14,292  16,787
   309$ 38,870$ 40,660  278$ 64,052$ 71,319  413$ 59,599$ 68,950
                   
(1) Represents post-modification outstanding recorded investment.      
(2) Represents pre-modification outstanding recorded investment.      
Troubled debt restructurings subsequent redefault
  Year Ended December 31, 2014 Year Ended December 31, 2013 Year Ended December 31, 2012
  Number of Loans Recorded Investment Number of Loans Recorded Investment Number of Loans Recorded Investment
  ($ in Thousands)
Commercial and industrial 1$ 52 15$ 1,493 16$ 1,736
Commercial real estate - owner occupied 3  785 4  542 10  4,729
Commercial real estate - investor 13  6,200 4  1,784 13  10,854
Real estate construction  1  160 4  80 5  1,695
Home equity 60  2,174 14  1,220 14  2,049
Installment and credit cards 3  34 0  ― 1  12
Residential mortgage 74  9,660 23  4,137 10  1,499
  155$ 19,065 64$ 9,256 69$ 22,574
             
Loans receivable related parties
  2014 
   ($ in Thousands) 
Balance at beginning of year$38,639 
New loans 52,703 
Repayments (16,922) 
Balance at end of year$74,420 
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, 2014.
             
    Pass Special Mention Potential Problem Impaired Total
    ($ Thousands)
Commercial and industrial$ 5,594,497$ 119,328  108,522$ 83,555$ 5,905,902
Commercial real estate - owner occupied  904,526  18,437  48,695  36,279  1,007,937
Lease financing  46,931  88  2,709  1,801  51,529
 Commercial and business lending  6,545,954  137,853  159,926  121,635  6,965,368
Commercial real estate - investor  2,974,493  12,137  24,043  45,812  3,056,485
Real estate construction  998,972  2,082  1,776  6,126  1,008,956
 Commercial real estate lending  3,973,465  14,219  25,819  51,938  4,065,441
  Total commercial$ 10,519,419$ 152,072$ 185,745$ 173,573$ 11,030,809
             
The following table presents commercial loans by credit quality indicator at December 31, 2013.
             
    Pass Special Mention Potential Problem Impaired Total
    ($ Thousands)
Commercial and industrial$ 4,485,160$ 153,615  113,669$ 70,236$ 4,822,680
Commercial real estate - owner occupied  959,849  55,404  56,789  42,673  1,114,715
Lease financing  52,733  897  1,784  69  55,483
 Commercial and business lending  5,497,742  209,916  172,242  112,978  5,992,878
Commercial real estate - investor  2,740,255  64,230  52,429  82,542  2,939,456
Real estate construction  877,911  2,814  5,263  10,260  896,248
 Commercial real estate lending  3,618,166  67,044  57,692  92,802  3,835,704
  Total commercial$ 9,115,908$ 276,960$ 229,934$ 205,780$ 9,828,582
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, 2014.
             
    Performing 30-89 Days Past Due Potential Problem Impaired Total
    ($ Thousands)
Home equity$ 1,592,788$ 10,583  880$ 31,807$ 1,636,058
Installment and credit cards  450,698  1,932  2  1,587  454,219
Residential mortgage  4,397,271  3,046  3,781  68,662  4,472,760
 Total consumer$ 6,440,757$ 15,561$ 4,663$ 102,056$ 6,563,037
             
The following table presents consumer loans by credit quality indicator at December 31, 2013.
             
    Performing 30-89 Days Past Due Potential Problem Impaired Total
    ($ Thousands)
Home equity$ 1,777,421$ 10,680  2,113$ 34,800$ 1,825,014
Installment  404,514  1,150  50  1,360  407,074
Residential mortgage  3,758,688  6,118  3,312  67,473  3,835,591
 Total consumer$ 5,940,623$ 17,948$ 5,475$ 103,633$ 6,067,679