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Allowance for Loan Losses Schedule of Credit Losses Related to Financing Receivables, Current and Non-Current (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]                
Financing Receivable, Allowance for Credit Losses, Write-downs $ 3,200   $ 12,600          
Provision for Loan, Lease, and Other Losses (9,192) (6,379) (38,982) (23,634)        
Originated Loans
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment   4,136   4,136   6,146    
Financing Receivable, Allowance for Credit Losses 90,883 98,291 90,883 98,291 91,950 96,484 98,645 98,942
Financing Receivable, Allowance for Credit Losses, Write-downs (11,410) (8,515) (35,718) (30,260)        
Financing Receivable, Allowance for Credit Losses, Recovery 5,481 5,638 15,608 18,127        
Provision for Loan, Lease, and Other Losses 4,862 2,523 14,509 11,482        
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 84,831 94,155 84,831 94,155   90,338    
Impaired Financing Receivable, Related Allowance 6,052   6,052          
Financing Receivable, Individually Evaluated for Impairment 91,971 89,901 91,971 89,901   87,764    
Financing Receivable, Collectively Evaluated for Impairment 11,979,788 9,699,238 11,979,788 9,699,238   10,125,623    
Financing Receivable, Net 12,071,759 9,789,139 12,071,759 9,789,139   10,213,387    
Originated Loans | Consumer Residential Mortgages Financing Receivable
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Financing Receivable, Net 605,998 487,283 605,998 487,283   529,253    
Originated Loans | Consumer Credit Card
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Financing Receivable, Net 160,113 145,113 160,113 145,113   148,313    
Originated Loans | Commercial Portfolio Segmen
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment   1,336   1,336   3,235    
Financing Receivable, Allowance for Credit Losses 37,125 43,178 37,125 43,178 43,256 42,981 45,167 36,209
Financing Receivable, Allowance for Credit Losses, Write-downs (3,569) (1,011) (9,203) (5,114)        
Financing Receivable, Allowance for Credit Losses, Recovery 1,262 1,162 2,681 5,745        
Provision for Loan, Lease, and Other Losses (3,824) (2,140) 666 6,338        
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 35,726 41,842 35,726 41,842   39,746    
Financing Receivable, Individually Evaluated for Impairment 11,155 7,476 11,155 7,476   8,053    
Financing Receivable, Collectively Evaluated for Impairment 5,028,165 3,856,619 5,028,165 3,856,619   4,131,514    
Financing Receivable, Net 5,039,320 3,864,095 5,039,320 3,864,095   4,139,567    
Originated Loans | Commercial Real Estate Portfolio Segment
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment   488   488   229    
Financing Receivable, Allowance for Credit Losses 8,446 15,148 8,446 15,148 8,730 12,265 16,823 20,126
Financing Receivable, Allowance for Credit Losses, Write-downs (570) (211) (3,345) (1,014)        
Financing Receivable, Allowance for Credit Losses, Recovery 43 168 77 503        
Provision for Loan, Lease, and Other Losses 243 (1,632) (551) (4,467)        
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 6,826 14,660 6,826 14,660   12,036    
Financing Receivable, Individually Evaluated for Impairment 22,597 19,755 22,597 19,755   20,616    
Financing Receivable, Collectively Evaluated for Impairment 2,097,137 2,207,657 2,097,137 2,207,657   2,149,171    
Financing Receivable, Net 2,119,734 2,227,412 2,119,734 2,227,412   2,169,787    
Originated Loans | Commercial Construction Financing Receivable Portfolio Segment
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment   0   0   0    
Financing Receivable, Allowance for Credit Losses 1,498 2,705 1,498 2,705 1,323 2,810 2,044 3,821
Financing Receivable, Allowance for Credit Losses, Write-downs 0 0 0 (516)        
Financing Receivable, Allowance for Credit Losses, Recovery 5 394 35 483        
Provision for Loan, Lease, and Other Losses 170 267 (1,347) (1,083)        
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 1,498 2,705 1,498 2,705   2,810    
Financing Receivable, Individually Evaluated for Impairment 0 958 0 958   906    
Financing Receivable, Collectively Evaluated for Impairment 467,112 327,904 467,112 327,904   338,019    
Financing Receivable, Net 467,112 328,862 467,112 328,862   338,925    
Originated Loans | Finance Leases Portfolio Segment
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment   0   0   0    
Financing Receivable, Allowance for Credit Losses 736 1,019 736 1,019 1,028 1,081 909 639
Financing Receivable, Allowance for Credit Losses, Write-downs 0 0 0 (1,237)        
Financing Receivable, Allowance for Credit Losses, Recovery 2 11 374 100        
Provision for Loan, Lease, and Other Losses (294) 99 (719) 1,517        
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 736 1,019 736 1,019   1,081    
Impaired Financing Receivable, Related Allowance 0   0          
Financing Receivable, Individually Evaluated for Impairment 0 0 0 0   0    
Financing Receivable, Collectively Evaluated for Impairment 339,936 199,907 339,936 199,907   239,551    
Financing Receivable, Net 339,936 199,907 339,936 199,907   239,551    
Originated Loans | Installment Financing Receivable Portfolio Segment
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment   552   552   1,014    
Financing Receivable, Allowance for Credit Losses 13,660 10,477 13,660 10,477 12,243 11,935 8,725 11,154
Financing Receivable, Allowance for Credit Losses, Write-downs (5,041) (3,582) (14,739) (11,788)        
Financing Receivable, Allowance for Credit Losses, Recovery 2,944 2,624 8,735 7,859        
Provision for Loan, Lease, and Other Losses 3,514 2,710 7,729 3,252        
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 12,574 9,925 12,574 9,925   10,921    
Financing Receivable, Individually Evaluated for Impairment 23,575 30,608 23,575 30,608   27,285    
Financing Receivable, Collectively Evaluated for Impairment 2,253,958 1,616,487 2,253,958 1,616,487   1,700,640    
Financing Receivable, Net 2,277,533 1,647,095 2,277,533 1,647,095   1,727,925    
Originated Loans | Home Equity Receivable Portfolio Segment
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment   197   197   223    
Financing Receivable, Allowance for Credit Losses 17,898 12,887 17,898 12,887 13,903 12,900 13,266 13,724
Financing Receivable, Allowance for Credit Losses, Write-downs (1,361) (1,843) (3,403) (5,177)        
Financing Receivable, Allowance for Credit Losses, Recovery 708 802 2,227 1,884        
Provision for Loan, Lease, and Other Losses 4,648 662 6,174 2,456        
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 17,708 12,690 17,708 12,690   12,677    
Financing Receivable, Individually Evaluated for Impairment 7,624 6,787 7,624 6,787   6,726    
Financing Receivable, Collectively Evaluated for Impairment 1,054,389 882,585 1,054,389 882,585   913,340    
Financing Receivable, Net 1,062,013 889,372 1,062,013 889,372   920,066    
Originated Loans | Credit Card Receivables Portfolio Segment
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment   261   261   312    
Financing Receivable, Allowance for Credit Losses 7,512 7,506 7,512 7,506 7,328 7,740 7,288 7,384
Financing Receivable, Allowance for Credit Losses, Write-downs (778) (1,367) (3,544) (4,229)        
Financing Receivable, Allowance for Credit Losses, Recovery 403 438 1,260 1,420        
Provision for Loan, Lease, and Other Losses 559 1,147 2,056 2,931        
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 7,190 7,245 7,190 7,245   7,428    
Financing Receivable, Individually Evaluated for Impairment 912 1,253 912 1,253   1,112    
Financing Receivable, Collectively Evaluated for Impairment 159,201 143,860 159,201 143,860   147,201    
Financing Receivable, Net 160,113 145,113 160,113 145,113   148,313    
Originated Loans | Residential Portfolio Segment
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment   1,302   1,302   1,133    
Financing Receivable, Allowance for Credit Losses 4,008 5,371 4,008 5,371 4,139 4,772 4,423 5,885
Financing Receivable, Allowance for Credit Losses, Write-downs (91) (501) (1,484) (1,185)        
Financing Receivable, Allowance for Credit Losses, Recovery 114 39 219 133        
Provision for Loan, Lease, and Other Losses (154) 1,410 501 538        
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 2,573 4,069 2,573 4,069   3,639    
Financing Receivable, Individually Evaluated for Impairment 26,108 23,064 26,108 23,064   23,066    
Financing Receivable, Collectively Evaluated for Impairment 579,890 464,219 579,890 464,219   506,187    
Financing Receivable, Net 605,998 487,283 605,998 487,283   529,253    
Originated Loans | Commercial and Industrial
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance 1,399   1,399          
Financing Receivable, Net 5,039,320 3,864,095 5,039,320 3,864,095   4,139,567    
Originated Loans | Commercial Real Estate
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance 1,620   1,620          
Originated Loans | Commercial Real Estate Construction Financing Receivable
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance 0   0          
Financing Receivable, Net 467,112 328,862 467,112 328,862   338,925    
Originated Loans | Installment
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Financing Receivable, Net 2,277,533 1,647,095 2,277,533 1,647,095   1,727,925    
Originated Loans | Home equity lines
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Financing Receivable, Net 1,062,013 889,372 1,062,013 889,372   920,066    
Originated Loans
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance 6,052 [1] 4,136 [1] 6,052 [1] 4,136 [1]   6,146 [1]    
Originated Loans | Consumer Residential Mortgages Financing Receivable
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance   1,302 [1]   1,302 [1]   1,133 [1]    
Originated Loans | Consumer Credit Card
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance   261 [1]   261 [1]   312 [1]    
Originated Loans | Commercial and Industrial
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance   1,336 [1]   1,336 [1]   3,235 [1]    
Originated Loans | Commercial Real Estate
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance   488 [1]   488 [1]   229 [1]    
Originated Loans | Commercial Real Estate Construction Financing Receivable
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance   0 [1]   0 [1]   0 [1]    
Originated Loans | Installment
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance   552 [1]   552 [1]   1,014 [1]    
Originated Loans | Home equity lines
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance   197 [1]   197 [1]   223 [1]    
Total Tdr Allowance
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance 7,088 7,621 7,088 7,621   7,201    
Total Tdr Allowance | Originated Loans
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance 3,756 3,342 3,756 3,342   3,379    
Total Tdr Allowance | Consumer Residential Mortgages Financing Receivable
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance 1,475 1,302 1,475 1,302   1,133    
Total Tdr Allowance | Consumer Residential Mortgages Financing Receivable | Originated Consumer Loans
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance 1,435 1,302 1,435 1,302   1,133    
Total Tdr Allowance | Consumer Credit Card
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance 322 261 322 261   312    
Total Tdr Allowance | Consumer Credit Card | Originated Consumer Loans
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance 322 261 322 261   312    
Total Tdr Allowance | Consumer Installment
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance 1,223 552 1,223 552   1,014    
Total Tdr Allowance | Consumer Installment | Originated Consumer Loans
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance 1,086 552 1,086 552   1,014    
Total Tdr Allowance | Home equity lines
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance 190 197 190 197   223    
Total Tdr Allowance | Home equity lines | Originated Consumer Loans
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Related Allowance $ 190 $ 197 $ 190 $ 197   $ 223    
[1] Note 1: These tables exclude loans fully charged off.Note 2: The differences between the recorded investment and unpaid principal balance amounts represent partial charge offs.