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Allowance for Loan and Lease Losses - Disaggregation by Impairment Methodology (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Allowance for loan and lease losses:            
Individually evaluated for impairment $ 665   $ 1,092      
Collectively evaluated for impairment 136,218   134,402      
Total allowance for loan and lease losses 136,883 $ 135,847 135,494 $ 136,360 $ 137,154 $ 135,484
Loans and leases:            
Individually evaluated for impairment 45,826   59,428      
Collectively evaluated for impairment 12,016,566   11,460,950      
Total loans and leases 12,062,392   11,520,378      
Commercial Lending            
Loans and leases:            
Total loans and leases 6,613,041   6,213,147      
Commercial and Industrial            
Allowance for loan and lease losses:            
Individually evaluated for impairment 5   380      
Collectively evaluated for impairment 33,336   32,749      
Total allowance for loan and lease losses 33,341 31,557 33,129 35,792 35,027 34,025
Loans and leases:            
Individually evaluated for impairment 19,285   27,572      
Collectively evaluated for impairment 3,311,807   3,212,028      
Total loans and leases 3,331,092   3,239,600      
Commercial Real Estate            
Allowance for loan and lease losses:            
Individually evaluated for impairment 7   7      
Collectively evaluated for impairment 20,004   18,441      
Total allowance for loan and lease losses 20,011 19,932 18,448 18,260 18,504 18,489
Loans and leases:            
Individually evaluated for impairment 9,263   12,545      
Collectively evaluated for impairment 2,536,216   2,330,950      
Total loans and leases 2,545,479   2,343,495      
Construction            
Allowance for loan and lease losses:            
Collectively evaluated for impairment 5,471   4,513      
Total allowance for loan and lease losses 5,471 4,532 4,513 4,636 4,514 3,793
Loans and leases:            
Collectively evaluated for impairment 555,794   450,012      
Total loans and leases 555,794   450,012      
Lease Financing            
Allowance for loan and lease losses:            
Collectively evaluated for impairment 857   847      
Total allowance for loan and lease losses 857 813 847 780 807 888
Loans and leases:            
Individually evaluated for impairment     153      
Collectively evaluated for impairment 180,676   179,887      
Total loans and leases 180,676   180,040      
Residential            
Allowance for loan and lease losses:            
Individually evaluated for impairment 653   705      
Collectively evaluated for impairment 43,721   42,731      
Total allowance for loan and lease losses 44,374 43,541 43,436 46,452 45,638 46,099
Loans and leases:            
Individually evaluated for impairment 17,278   19,158      
Collectively evaluated for impairment 3,904,603   3,777,301      
Total loans and leases 3,921,881   3,796,459      
Consumer            
Allowance for loan and lease losses:            
Collectively evaluated for impairment 27,903   28,388      
Total allowance for loan and lease losses 27,903 27,456 28,388 28,386 27,923 28,385
Loans and leases:            
Collectively evaluated for impairment 1,527,470   1,510,772      
Total loans and leases 1,527,470   1,510,772      
Unallocated            
Allowance for loan and lease losses:            
Collectively evaluated for impairment 4,926   6,733      
Total allowance for loan and lease losses $ 4,926 $ 8,016 $ 6,733 $ 2,054 $ 4,741 $ 3,805