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Allowance for Loan and Lease Loss and Credit Quality (Internal Risk Rating By Loan Class) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality $ 17,355,240 $ 16,866,536  
Loans and leases 17,355,240 16,866,536 $ 15,988,752
GNMA loans, right to repurchase 64,011 62,768  
Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment [Line Items]      
GNMA loans, right to repurchase 34,371 34,345  
Pass/Watch      
Financing Receivable, Recorded Investment [Line Items]      
Loans and leases $ 16,825,697 $ 16,345,001  
Percentage of impaired loans 1.90% 5.00%  
Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans and leases $ 230,039 $ 205,959  
Percentage of impaired loans 13.00% 4.60%  
Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans and leases $ 231,059 $ 238,950  
Percentage of impaired loans 85.10%    
Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Loans and leases $ 6,959 5,871  
Loss      
Financing Receivable, Recorded Investment [Line Items]      
Loans and leases 6,651 $ 18,642  
Percentage of impaired loans   90.40%  
Impaired      
Financing Receivable, Recorded Investment [Line Items]      
Loans and leases 54,835 $ 52,113  
Commercial Real Estate | Non-owner Occupied Term      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 3,377,464 3,226,836  
GNMA loans, right to repurchase 2,765 3,837  
Commercial Real Estate | Non-owner Occupied Term | Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment [Line Items]      
GNMA loans, right to repurchase 1,023 137  
Commercial Real Estate | Owner Occupied Term      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 2,581,786 2,582,874  
GNMA loans, right to repurchase 4,573 3,370  
Commercial Real Estate | Owner Occupied Term | Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment [Line Items]      
GNMA loans, right to repurchase 505 423  
Commercial Real Estate | Multifamily      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 3,004,890 3,151,516  
GNMA loans, right to repurchase 516 1,394  
Commercial Real Estate | Multifamily | Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment [Line Items]      
GNMA loans, right to repurchase 0 0  
Commercial Real Estate | Construction & Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 367,879 271,119  
GNMA loans, right to repurchase 0 2,959  
Commercial Real Estate | Construction & Development | Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment [Line Items]      
GNMA loans, right to repurchase 0 0  
Commercial Real Estate | Residential Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 111,941 99,459  
GNMA loans, right to repurchase 0 0  
Commercial Real Estate | Residential Development | Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment [Line Items]      
GNMA loans, right to repurchase 0 0  
Commercial Real Estate | Pass/Watch | Non-owner Occupied Term      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 3,214,630 3,033,962  
Commercial Real Estate | Pass/Watch | Owner Occupied Term      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 2,455,731 2,454,326  
Commercial Real Estate | Pass/Watch | Multifamily      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 2,974,155 3,121,099  
Commercial Real Estate | Pass/Watch | Construction & Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 360,878 262,759  
Commercial Real Estate | Pass/Watch | Residential Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 103,108 89,706  
Commercial Real Estate | Special Mention | Non-owner Occupied Term      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 78,546 92,038  
Commercial Real Estate | Special Mention | Owner Occupied Term      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 62,793 54,684  
Commercial Real Estate | Special Mention | Multifamily      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 8,728 7,626  
Commercial Real Estate | Special Mention | Construction & Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 2,969 4,532  
Commercial Real Estate | Special Mention | Residential Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 0 507  
Commercial Real Estate | Substandard | Non-owner Occupied Term      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 68,090 88,793  
Commercial Real Estate | Substandard | Owner Occupied Term      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 56,245 65,029  
Commercial Real Estate | Substandard | Multifamily      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 17,974 19,272  
Commercial Real Estate | Substandard | Construction & Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 2,106 2,124  
Commercial Real Estate | Substandard | Residential Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 1,188 1,355  
Commercial Real Estate | Doubtful | Non-owner Occupied Term      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 107 270  
Commercial Real Estate | Doubtful | Owner Occupied Term      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 368 675  
Commercial Real Estate | Doubtful | Multifamily      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 0 0  
Commercial Real Estate | Doubtful | Construction & Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 0 0  
Commercial Real Estate | Doubtful | Residential Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 0 0  
Commercial Real Estate | Loss | Non-owner Occupied Term      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 137 279  
Commercial Real Estate | Loss | Owner Occupied Term      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 1,301 1,361  
Commercial Real Estate | Loss | Multifamily      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 0 0  
Commercial Real Estate | Loss | Construction & Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 0 0  
Commercial Real Estate | Loss | Residential Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 0 0  
Commercial Real Estate | Impaired | Non-owner Occupied Term      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 15,954 11,494  
Commercial Real Estate | Impaired | Owner Occupied Term      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 5,348 6,799  
Commercial Real Estate | Impaired | Multifamily      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 4,033 3,519  
Commercial Real Estate | Impaired | Construction & Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 1,926 1,704  
Commercial Real Estate | Impaired | Residential Development      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 7,645 7,891  
Commercial | Term      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 1,440,704 1,408,676  
GNMA loans, right to repurchase 580 630  
Commercial | Term | Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment [Line Items]      
GNMA loans, right to repurchase 317 0  
Commercial | LOC & Other      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 1,116,876 1,036,733  
GNMA loans, right to repurchase 1,863 2,007  
Commercial | LOC & Other | Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment [Line Items]      
GNMA loans, right to repurchase 0 8  
Commercial | Leases and Equipment Finance      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 884,506 729,161  
GNMA loans, right to repurchase 9,258 7,254  
Commercial | Leases and Equipment Finance | Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment [Line Items]      
GNMA loans, right to repurchase 933 822  
Commercial | Pass/Watch | Term      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 1,376,346 1,356,675  
Commercial | Pass/Watch | LOC & Other      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 1,066,651 998,603  
Commercial | Pass/Watch | Leases and Equipment Finance      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 868,035 716,190  
Commercial | Special Mention | Term      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 29,032 13,620  
Commercial | Special Mention | LOC & Other      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 29,991 19,183  
Commercial | Special Mention | Leases and Equipment Finance      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 5,240 3,849  
Commercial | Substandard | Term      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 17,976 20,463  
Commercial | Substandard | LOC & Other      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 17,095 15,959  
Commercial | Substandard | Leases and Equipment Finance      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 3,923 3,499  
Commercial | Doubtful | Term      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 137 36  
Commercial | Doubtful | LOC & Other      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 0 1  
Commercial | Doubtful | Leases and Equipment Finance      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 6,347 4,889  
Commercial | Loss | Term      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 423 162  
Commercial | Loss | LOC & Other      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 0 1  
Commercial | Loss | Leases and Equipment Finance      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 961 734  
Commercial | Impaired | Term      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 16,790 17,720  
Commercial | Impaired | LOC & Other      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 3,139 2,986  
Commercial | Impaired | Leases and Equipment Finance      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 0 0  
Residential | Mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 2,882,076 2,909,306  
GNMA loans, right to repurchase 35,105 31,708  
Residential | Mortgage | Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment [Line Items]      
GNMA loans, right to repurchase 30,012 29,233  
Residential | Mortgage | Financing Receivables, Equal to Greater than 90 Days Past Due | GNMA Loans      
Financing Receivable, Recorded Investment [Line Items]      
GNMA loans, right to repurchase 11,300 19,200  
Residential | Home Equity Loans & Lines      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 989,814 923,667  
GNMA loans, right to repurchase 4,883 4,807  
Residential | Home Equity Loans & Lines | Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment [Line Items]      
GNMA loans, right to repurchase 1,310 3,080  
Residential | Pass/Watch | Mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 2,829,847 2,871,423  
Residential | Pass/Watch | Home Equity Loans & Lines      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 983,513 917,919  
Residential | Special Mention | Mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 5,020 3,557  
Residential | Special Mention | Home Equity Loans & Lines      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 3,521 2,189  
Residential | Substandard | Mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 44,236 21,195  
Residential | Substandard | Home Equity Loans & Lines      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 1,998 803  
Residential | Doubtful | Mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 0 0  
Residential | Doubtful | Home Equity Loans & Lines      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 0 0  
Residential | Loss | Mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 2,973 13,131  
Residential | Loss | Home Equity Loans & Lines      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 782 2,756  
Residential | Impaired | Mortgage      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 0 0  
Residential | Impaired | Home Equity Loans & Lines      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 0 0  
Consumer & Other      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 597,304 527,189  
GNMA loans, right to repurchase 4,468 4,802  
Consumer & Other | Financing Receivables, Equal to Greater than 90 Days Past Due      
Financing Receivable, Recorded Investment [Line Items]      
GNMA loans, right to repurchase 271 642  
Consumer & Other | Pass/Watch      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 592,803 522,339  
Consumer & Other | Special Mention      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 4,199 4,174  
Consumer & Other | Substandard      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 228 458  
Consumer & Other | Doubtful      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 0 0  
Consumer & Other | Loss      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality 74 218  
Consumer & Other | Impaired      
Financing Receivable, Recorded Investment [Line Items]      
Loans by credit quality $ 0 $ 0