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Loans, Allowance for Loan Losses, and Credit Quality (Tables)
 9 Months Ended
Sep. 30, 2014
Financing Receivable, Impaired [Line Items]  
Loan composition
The period end loan composition was as follows.
          
     September 30,  December 31, 
     2014  2013 
     ($ in Thousands) 
Commercial and industrial$ 5,603,899 $ 4,822,680 
Commercial real estate - owner occupied  1,014,335   1,114,715 
Lease financing  52,600   55,483 
 Commercial and business lending  6,670,834   5,992,878 
Commercial real estate - investor  3,043,361   2,939,456 
Real estate construction  982,426   896,248 
 Commercial real estate lending  4,025,787   3,835,704 
  Total commercial  10,696,621   9,828,582 
Home equity  1,676,525   1,825,014 
Installment and credit cards  459,682   407,074 
Residential mortgage  4,326,262   3,835,591 
  Total consumer  6,462,469   6,067,679 
   Total loans$ 17,159,090 $ 15,896,261 
Changes in the allowance for loan losses
A summary of the changes in the allowance for credit losses was as follows.
        
  Nine Months Ended Year Ended 
  September 30, 2014 December 31, 2013 
   ($ in Thousands) 
Allowance for Loan Losses:      
Balance at beginning of period$268,315 $297,409 
Provision for loan losses 8,500  10,000 
Charge offs (35,318)  (88,061) 
Recoveries 24,765  48,967 
 Net charge offs (10,553)  (39,094) 
Balance at end of period$266,262 $268,315 
Allowance for Unfunded Commitments:      
Balance at beginning of period$ 21,900 $21,800 
Provision for unfunded commitments  2,500  100 
Balance at end of period$24,400 $21,900 
Allowance for Credit Losses$290,662 $290,215 
Changes in the allowance for loan losses by portfolio segment
 
                   
$ 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  18,700  1,098  777  (14,292)  (3,831)  1,278  3,486  1,284  8,500
Charge offs  (11,421)  (2,963)  (29)  (4,358)  (1,761)  (9,713)  (1,751)  (3,322)  (35,318)
Recoveries  9,501  1,427  6  9,693  503  2,546  481  608  24,765
Balance at Sep 30, 2014$ 121,281$ 19,038$ 2,361$ 49,199$ 18,329$ 26,307$ 4,632$ 25,115$ 266,262
                   
Allowance for loan losses:          
Ending balance impaired loans individually evaluated for impairment$ 14,006$ 1,672$ 735$ 1,829$ 1,140$ 11$ -$ 588$ 19,981
Ending balance impaired loans collectively evaluated for impairment$ 3,590$ 2,404$ 4$ 2,429$ 1,021$ 12,480$ 339$ 11,503$ 33,770
Total impaired loans$ 17,596$ 4,076$ 739$ 4,258$ 2,161$ 12,491$ 339$ 12,091$ 53,751
Ending balance all other loans collectively evaluated for impairment$ 103,685$ 14,962$ 1,622$ 44,941$ 16,168$ 13,816$ 4,293$ 13,024$ 212,511
Total$ 121,281$ 19,038$ 2,361$ 49,199$ 18,329$ 26,307$ 4,632$ 25,115$ 266,262
                   
Loans:                  
Ending balance impaired loans individually evaluated for impairment$ 45,242$ 17,927$ 1,938$ 21,204$ 6,026$ 1,025$ -$ 10,390$ 103,752
Ending balance impaired loans collectively evaluated for impairment$ 42,856$ 17,987$ 9$ 28,342$ 2,966$ 30,818$ 1,759$ 60,252$ 184,989
Total impaired loans$ 88,098$ 35,914$ 1,947$ 49,546$ 8,992$ 31,843$ 1,759$ 70,642$ 288,741
Ending balance all other loans collectively evaluated for impairment$ 5,515,801$ 978,421$ 50,653$ 2,993,815$ 973,434$ 1,644,682$ 457,923$ 4,255,620$ 16,870,349
Total$ 5,603,899$ 1,014,335$ 52,600$ 3,043,361$ 982,426$ 1,676,525$ 459,682$ 4,326,262$ 17,159,090

                   
$ in ThousandsCommercial and industrialCommercial real estate - owner occupiedLease financingCommercial real estate - investorReal estate constructionHome equityInstallment Residential 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 September 30, 2014.
             
  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$ 2,035$ 1,912$ 269$ 4,216$ 5,548,540$ 5,552,756
Commercial real estate - owner occupied  1,024  1,651  -  2,675  987,320  989,995
Lease financing  -  -  -  -  50,653  50,653
Commercial and business lending  3,059  3,563  269  6,891  6,586,513  6,593,404
Commercial real estate - investor  15,869  -  -  15,869  3,002,386  3,018,255
Real estate construction  299  100  -  399  973,840  974,239
Commercial real estate lending  16,168  100  -  16,268  3,976,226  3,992,494
Total commercial  19,227  3,663  269  23,159  10,562,739  10,585,898
Home equity  7,999  2,739  -  10,738  1,644,526  1,655,264
Installment and credit cards  1,106  712  1,369  3,187  455,842  459,029
Residential mortgage  2,944  287  52  3,283  4,271,478  4,274,761
Total consumer  12,049  3,738  1,421  17,208  6,371,846  6,389,054
Total accruing loans$ 31,276$ 7,401$ 1,690$ 40,367$ 16,934,585$ 16,974,952
             
Nonaccrual loans            
Commercial and industrial$ 2,061$ 1,254$ 7,633$ 10,948$ 40,195$ 51,143
Commercial real estate - owner occupied  429  582  10,159  11,170  13,170  24,340
Lease financing  -  -  550  550  1,397  1,947
Commercial and business lending  2,490  1,836  18,342  22,668  54,762  77,430
Commercial real estate - investor  140  685  8,418  9,243  15,863  25,106
Real estate construction  64  56  1,061  1,181  7,006  8,187
Commercial real estate lending  204  741  9,479  10,424  22,869  33,293
Total commercial  2,694  2,577  27,821  33,092  77,631  110,723
Home equity  1,606  2,067  10,607  14,280  6,981  21,261
Installment and credit cards  57  49  138  244  409  653
Residential mortgage  3,934  2,657  22,117  28,708  22,793  51,501
Total consumer  5,597  4,773  32,862  43,232  30,183  73,415
Total nonaccrual loans **$ 8,291$ 7,350$ 60,683$ 76,324$ 107,814$ 184,138
             
Total loans            
Commercial and industrial$ 4,096$ 3,166$ 7,902$ 15,164$ 5,588,735$ 5,603,899
Commercial real estate - owner occupied  1,453  2,233  10,159  13,845  1,000,490  1,014,335
Lease financing  -  -  550  550  52,050  52,600
Commercial and business lending  5,549  5,399  18,611  29,559  6,641,275  6,670,834
Commercial real estate - investor  16,009  685  8,418  25,112  3,018,249  3,043,361
Real estate construction  363  156  1,061  1,580  980,846  982,426
Commercial real estate lending  16,372  841  9,479  26,692  3,999,095  4,025,787
Total commercial  21,921  6,240  28,090  56,251  10,640,370  10,696,621
Home equity  9,605  4,806  10,607  25,018  1,651,507  1,676,525
Installment and credit cards  1,163  761  1,507  3,431  456,251  459,682
Residential mortgage  6,878  2,944  22,169  31,991  4,294,271  4,326,262
Total consumer  17,646  8,511  34,283  60,440  6,402,029  6,462,469
Total loans$ 39,567$ 14,751$ 62,373$ 116,691$ 17,042,399$ 17,159,090
             
* The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at September 30, 2014 (the same as the reported balances for the accruing loans noted above). ** The percent of nonaccrual loans which are current was 59% at September 30, 2014.

The following table presents loans by past due status at December 31, 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$ 3,390$ 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 September 30, 2014.
           
  Recorded Investment Unpaid Principal Balance Related Allowance  YTD Average Recorded Investment YTD Interest Income Recognized(a)
Loans with a related allowance  ($ in Thousands)
Commercial and industrial$ 74,410$ 76,852$ 17,596$ 74,470$ 2,548
Commercial real estate - owner occupied  23,250  25,849  4,076  24,412  585
Lease financing  1,946  1,946  739  2,074  -
Commercial and business lending  99,606  104,647  22,411  100,956  3,133
Commercial real estate - investor  38,566  42,836  4,258  40,288  988
Real estate construction  5,778  8,576  2,161  6,702  158
Commercial real estate lending  44,344  51,412  6,419  46,990  1,146
Total commercial  143,950  156,059  28,830  147,946  4,279
Home equity  30,996  34,392  12,491  31,842  1,105
Installment and credit cards  1,759  1,979  339  1,864  41
Residential mortgage  62,916  67,457  12,091  63,920  1,526
Total consumer  95,671  103,828  24,921  97,626  2,672
Total loans$ 239,621$ 259,887$ 53,751$ 245,572$ 6,951
           
Loans with no related allowance           
Commercial and industrial$ 13,688$ 21,230$ -$ 16,781$ 46
Commercial real estate - owner occupied  12,664  14,996  -  13,775  36
Lease financing  1  -  -  -  -
Commercial and business lending  26,353  36,226  -  30,556  82
Commercial real estate - investor  10,980  17,169  -  12,556  133
Real estate construction  3,214  3,904  -  3,313  -
Commercial real estate lending  14,194  21,073  -  15,869  133
Total commercial  40,547  57,299  -  46,425  215
Home equity  847  859  -  864  15
Installment and credit cards  -  -  -  -  -
Residential mortgage  7,726  7,845  -  7,774  104
Total consumer  8,573  8,704  -  8,638  119
Total loans$ 49,120$ 66,003$ -$ 55,063$ 334
           
Total          
Commercial and industrial$ 88,098$ 98,082$ 17,596$ 91,251$ 2,594
Commercial real estate - owner occupied  35,914  40,845  4,076  38,187  621
Lease financing  1,947  1,946  739  2,074  -
Commercial and business lending  125,959  140,873  22,411  131,512  3,215
Commercial real estate - investor  49,546  60,005  4,258  52,844  1,121
Real estate construction  8,992  12,480  2,161  10,015  158
Commercial real estate lending  58,538  72,485  6,419  62,859  1,279
Total commercial  184,497  213,358  28,830  194,371  4,494
Home equity  31,843  35,251  12,491  32,706  1,120
Installment and credit cards  1,759  1,979  339  1,864  41
Residential mortgage  70,642  75,302  12,091  71,694  1,630
Total consumer  104,244  112,532  24,921  106,264  2,791
Total loans(b)$ 288,741$ 325,890$ 53,751$ 300,635$ 7,285
           
(a) Interest income recognized included $4 million of interest income recognized on accruing restructured loans for the nine months ended September 30, 2014.
(b) The implied fair value mark on all impaired loans at September 30, 2014, was 72% of their unpaid principal balance. The 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 YTD Average Recorded Investment YTD Interest Income Recognized (a)
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
Lease financing  -  -  -  -  -
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 (b)$ 309,413$ 361,694$ 51,875$ 328,022$ 10,137
           
(a) Interest income recognized included $6 million of interest income recognized on accruing restructured loans for the year ended December 31, 2013.
(b) The implied fair value mark on all impaired loans at December 31, 2013, was 71% of their unpaid principal balance. The fair value mark is calculated as the recorded investment, net of the related allowance, divided by the unpaid principal balance.
Nonaccrual and Performing Restructured Loans
  September 30, 2014  December 31, 2013 
  Performing Restructured Loans  Nonaccrual Restructured Loans *  Performing Restructured Loans  Nonaccrual Restructured Loans * 
  ($ in Thousands)
Commercial and industrial$ 36,956 $ 4,759 $ 32,517 $ 6,900 
Commercial real estate - owner occupied  11,574   8,031   13,009   10,999 
Commercial real estate - investor  24,439   17,472   44,946   18,069 
Real estate construction   805   2,833   3,793   2,065 
Home equity  10,582   6,729   9,633   5,419 
Installment and credit cards  1,106   230   246   451 
Residential mortgage  19,141   23,260   19,841   15,682 
Total $ 104,603 $ 63,314 $ 123,985 $ 59,585 
             
* 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 nine months ended September 30, 2014, and the recorded investment and unpaid principal balance as of September 30, 2014.
             
  Three Months Ended September 30, 2014 Nine Months Ended September 30, 2014
  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  10$ 7,383$ 7,384  13$ 7,695$ 7,707
Commercial real estate - owner occupied  ―  ―  ―  2  1,123  1,260
Commercial real estate - investor  3  5,603  5,918  4  6,096  6,425
Real estate construction   1  8  8  2  14  14
Home equity  42  1,428  1,486  94  3,407  3,593
Installment and credit cards  2  25  25  3  34  45
Residential mortgage  45  4,057  4,347  85  8,004  8,555
Total  103$ 18,504$ 19,168  203$ 26,373$ 27,599
             
(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 nine months ended September 30, 2013, and the recorded investment and unpaid principal balance as of September 30, 2013.
             
  Three Months Ended September 30, 2013 Nine Months Ended September 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  19$ 5,479$ 6,384  58$ 11,379$ 14,028
Commercial real estate - owner occupied  7  3,373  3,488  17  9,313  9,596
Commercial real estate - investor  10  1,222  1,304  18  5,013  5,320
Real estate construction   3  227  248  9  2,006  2,084
Home equity  16  933  985  74  4,149  4,554
Installment  ―  ―  ―  2  187  193
Residential mortgage  19  1,664  1,826  71  6,744  7,619
Total  74$ 12,898$ 14,235  249$ 38,791$ 43,394
             
(1) Represents post-modification outstanding recorded investment.      
(2) Represents pre-modification outstanding recorded investment.      
Troubled debt restructurings subsequent redefault
  Three Months Ended September 30, 2014 Nine Months Ended September 30, 2014
  Number of LoansRecorded InvestmentNumber of Loans Recorded Investment
  ($ in Thousands)
Commercial and industrial  ―$ ― 1$ 52
Commercial real estate - owner occupied  ―  ― 2  203
Commercial real estate - investor 1  493 2  1,613
Real estate construction   ―  ― 1  160
Home equity 12  367 25  939
Installment and credit cards 1  10 3  34
Residential mortgage 18  1,502 50  4,743
Total 32$ 2,372 84$ 7,744

  Three Months Ended September 30, 2013 Nine Months Ended September 30, 2013
  Number of LoansRecorded InvestmentNumber of Loans Recorded Investment
  ($ in Thousands)
Commercial and industrial 8$ 506 18$ 1,626
Commercial real estate - owner occupied 2  464 4  578
Commercial real estate - investor 1  405 5  1,992
Real estate construction  1  118 2  158
Home equity 4  147 12  699
Residential mortgage 8  1,150 15  2,385
Total 24$ 2,790 56$ 7,438
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 September 30, 2014.
           
  Pass Special Mention Potential Problem Impaired Total
  ($ in Thousands)
Commercial and industrial$ 5,268,521$ 113,864$ 133,416$ 88,098$ 5,603,899
Commercial real estate - owner occupied  900,306  29,107  49,008  35,914  1,014,335
Lease financing  45,506  1,360  3,787  1,947  52,600
Commercial and business lending  6,214,333  144,331  186,211  125,959  6,670,834
Commercial real estate - investor  2,930,817  34,524  28,474  49,546  3,043,361
Real estate construction  967,914  3,293  2,227  8,992  982,426
Commercial real estate lending  3,898,731  37,817  30,701  58,538  4,025,787
Total commercial$ 10,113,064$ 182,148$ 216,912$ 184,497$ 10,696,621
           
The following table presents commercial loans by credit quality indicator at December 31, 2013.
           
  Pass Special Mention Potential Problem Impaired Total
  ($ in 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 September 30, 2014.
           
  Performing 30-89 Days Past Due Potential Problem Impaired Total
  ($ in Thousands)
Home equity$ 1,633,033$ 10,738$ 911$ 31,843$ 1,676,525
Installment and credit cards  456,101  1,818  4  1,759  459,682
Residential mortgage  4,250,223  3,231  2,166  70,642  4,326,262
Total consumer$ 6,339,357$ 15,787$ 3,081$ 104,244$ 6,462,469
           
The following table presents consumer loans by credit quality indicator at December 31, 2013.
           
  Performing 30-89 Days Past Due Potential Problem Impaired Total
  ($ in 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