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Allowance for Loan and Lease Losses - Disaggregation by Impairment Methodology (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Allowance for loan and lease losses:            
Individually evaluated for impairment $ 559   $ 592      
Collectively evaluated for impairment 134,466   134,892      
Total allowance for loan and lease losses 135,025 $ 136,360 135,484 $ 135,447 $ 136,338 $ 134,799
Loans and leases:            
Individually evaluated for impairment 60,383   44,147      
Collectively evaluated for impairment 11,336,172   10,677,883      
Total loans and leases 11,396,555   10,722,030      
Commercial Lending            
Loans and leases:            
Total loans and leases 6,239,675   5,788,042      
Commercial and Industrial            
Allowance for loan and lease losses:            
Individually evaluated for impairment 7          
Collectively evaluated for impairment 34,153   34,025      
Total allowance for loan and lease losses 34,160 35,792 34,025 32,908 32,914 31,835
Loans and leases:            
Individually evaluated for impairment 29,444   15,845      
Collectively evaluated for impairment 3,235,847   3,041,610      
Total loans and leases 3,265,291   3,057,455      
Commercial Real Estate            
Allowance for loan and lease losses:            
Individually evaluated for impairment 7          
Collectively evaluated for impairment 18,516   18,489      
Total allowance for loan and lease losses 18,523 18,260 18,489 18,374 15,698 16,320
Loans and leases:            
Individually evaluated for impairment 13,302   5,787      
Collectively evaluated for impairment 2,298,572   2,158,661      
Total loans and leases 2,311,874   2,164,448      
Construction            
Allowance for loan and lease losses:            
Collectively evaluated for impairment 5,232   3,793      
Total allowance for loan and lease losses 5,232 4,636 3,793 3,246 3,626 4,725
Loans and leases:            
Collectively evaluated for impairment 475,333   367,460      
Total loans and leases 475,333   367,460      
Lease Financing            
Allowance for loan and lease losses:            
Collectively evaluated for impairment 725   888      
Total allowance for loan and lease losses 725 780 888 970 1,008 1,089
Loans and leases:            
Individually evaluated for impairment 163   181      
Collectively evaluated for impairment 187,014   198,498      
Total loans and leases 187,177   198,679      
Residential            
Allowance for loan and lease losses:            
Individually evaluated for impairment 545   592      
Collectively evaluated for impairment 45,497   45,507      
Total allowance for loan and lease losses 46,042 46,452 46,099 45,827 45,686 44,858
Loans and leases:            
Individually evaluated for impairment 17,474   22,334      
Collectively evaluated for impairment 3,670,186   3,510,093      
Total loans and leases 3,687,660   3,532,427      
Consumer            
Allowance for loan and lease losses:            
Collectively evaluated for impairment 28,214   28,385      
Total allowance for loan and lease losses 28,214 28,386 28,385 27,415 26,840 27,041
Loans and leases:            
Collectively evaluated for impairment 1,469,220   1,401,561      
Total loans and leases 1,469,220   1,401,561      
Unallocated            
Allowance for loan and lease losses:            
Collectively evaluated for impairment 2,129   3,805      
Total allowance for loan and lease losses $ 2,129 $ 2,054 $ 3,805 $ 6,707 $ 10,566 $ 8,931