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Allowance for Loan and Lease Losses - Activity (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
segment
class
Mar. 31, 2016
USD ($)
Allowance for loan and lease losses    
Number of primary portfolio segments | segment 3  
Activity in allowance for loan losses    
Balance at beginning of period $ 135,494 $ 135,484
Charge-offs (6,449) (4,364)
Recoveries 2,302 5,334
Increase (decrease) in Provision 4,500 700
Balance at end of period $ 135,847 137,154
Commercial Lending    
Allowance for loan and lease losses    
Number of distinct portfolios | class 4  
Commercial and Industrial    
Activity in allowance for loan losses    
Balance at beginning of period $ 33,129 34,025
Charge-offs (855) (86)
Recoveries 114 203
Increase (decrease) in Provision (831) 885
Balance at end of period 31,557 35,027
Commercial Real Estate    
Activity in allowance for loan losses    
Balance at beginning of period 18,448 18,489
Recoveries 77 3,199
Increase (decrease) in Provision 1,407 (3,184)
Balance at end of period 19,932 18,504
Construction    
Activity in allowance for loan losses    
Balance at beginning of period 4,513 3,793
Increase (decrease) in Provision 19 721
Balance at end of period 4,532 4,514
Lease Financing    
Activity in allowance for loan losses    
Balance at beginning of period 847 888
Increase (decrease) in Provision (34) (81)
Balance at end of period 813 807
Residential    
Allowance for loan and lease losses    
Specific allocation for impaired loans in which the net collateral value exceeds the unpaid principal balance of the loan 0  
Activity in allowance for loan losses    
Balance at beginning of period 43,436 46,099
Charge-offs (22) (72)
Recoveries 321 306
Increase (decrease) in Provision (194) (695)
Balance at end of period 43,541 45,638
Consumer    
Activity in allowance for loan losses    
Balance at beginning of period 28,388 28,385
Charge-offs (5,572) (4,206)
Recoveries 1,790 1,626
Increase (decrease) in Provision 2,850 2,118
Balance at end of period 27,456 27,923
Unallocated    
Activity in allowance for loan losses    
Balance at beginning of period 6,733 3,805
Increase (decrease) in Provision 1,283 936
Balance at end of period $ 8,016 $ 4,741