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Allowance for Loan and Lease Losses - Activity (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
segment
class
Mar. 31, 2017
USD ($)
Allowance for loan and lease losses    
Number of primary portfolio segments | segment 3  
Activity in allowance for loan losses    
Balance at beginning of period $ 137,253 $ 135,494
Charge-offs (7,100) (6,449)
Recoveries 2,471 2,302
Increase (decrease) in Provision 5,950 4,500
Balance at end of period $ 138,574 135,847
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 $ 34,006 33,129
Charge-offs (475) (855)
Recoveries 64 114
Increase (decrease) in Provision 770 (831)
Balance at end of period 34,365 31,557
Commercial Real Estate    
Activity in allowance for loan losses    
Balance at beginning of period 18,044 18,448
Recoveries 122 77
Increase (decrease) in Provision 1,088 1,407
Balance at end of period 19,254 19,932
Construction    
Activity in allowance for loan losses    
Balance at beginning of period 6,817 4,513
Increase (decrease) in Provision (841) 19
Balance at end of period 5,976 4,532
Lease Financing    
Activity in allowance for loan losses    
Balance at beginning of period 611 847
Increase (decrease) in Provision (26) (34)
Balance at end of period 585 813
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 42,852 43,436
Charge-offs   (22)
Recoveries 182 321
Increase (decrease) in Provision 186 (194)
Balance at end of period 43,220 43,541
Consumer    
Activity in allowance for loan losses    
Balance at beginning of period 31,249 28,388
Charge-offs (6,625) (5,572)
Recoveries 2,103 1,790
Increase (decrease) in Provision 4,271 2,850
Balance at end of period 30,998 27,456
Unallocated    
Activity in allowance for loan losses    
Balance at beginning of period 3,674 6,733
Increase (decrease) in Provision 502 1,283
Balance at end of period $ 4,176 $ 8,016