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Allowance for Loan and Lease Losses - Activity (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
segment
class
Mar. 31, 2018
USD ($)
Allowance for loan and lease losses    
Number of primary portfolio segments | segment 3  
Allowance for loan and lease losses:    
Balance at beginning of period $ 141,718 $ 137,253
Charge-offs (8,622) (7,100)
Recoveries 2,770 2,471
Increase (decrease) in Provision 5,680 5,950
Balance at end of period $ 141,546 138,574
Commercial Lending    
Allowance for loan and lease losses    
Number of distinct portfolios | class 4  
Commercial and Industrial    
Allowance for loan and lease losses:    
Balance at beginning of period $ 34,501 34,006
Charge-offs   (475)
Recoveries 37 64
Increase (decrease) in Provision (2,745) 770
Balance at end of period 31,793 34,365
Commercial Real Estate    
Allowance for loan and lease losses:    
Balance at beginning of period 19,725 18,044
Recoveries 31 122
Increase (decrease) in Provision 1,441 1,088
Balance at end of period 21,197 19,254
Construction    
Allowance for loan and lease losses:    
Balance at beginning of period 5,813 6,817
Increase (decrease) in Provision (432) (841)
Balance at end of period 5,381 5,976
Lease Financing    
Allowance for loan and lease losses:    
Balance at beginning of period 432 611
Charge-offs (24)  
Increase (decrease) in Provision 3 (26)
Balance at end of period 411 585
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  
Allowance for loan and lease losses:    
Balance at beginning of period 44,906 42,852
Recoveries 250 182
Increase (decrease) in Provision (245) 186
Balance at end of period 44,911 43,220
Consumer    
Allowance for loan and lease losses:    
Balance at beginning of period 35,813 31,249
Charge-offs (8,598) (6,625)
Recoveries 2,452 2,103
Increase (decrease) in Provision 5,432 4,271
Balance at end of period 35,099 30,998
Unallocated    
Allowance for loan and lease losses:    
Balance at beginning of period 528 3,674
Increase (decrease) in Provision 2,226 502
Balance at end of period $ 2,754 $ 4,176