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Allowance for Loan and Lease Losses - Activity (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
segment
class
Sep. 30, 2015
USD ($)
Allowance for loan and lease losses        
Number of primary portfolio segments | segment     3  
Activity in allowance for loan losses        
Balance at beginning of period $ 136,360 $ 136,338 $ 135,484 $ 134,799
Charge-offs (5,356) (5,816) (14,523) (14,807)
Recoveries 1,921 2,375 9,364 8,055
Increase (decrease) in Provision 2,100 2,550 4,700 7,400
Balance at end of period 135,025 135,447 $ 135,025 135,447
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 35,792 32,914 $ 34,025 31,835
Charge-offs (210) (461) (348) (765)
Recoveries 6 178 228 884
Increase (decrease) in Provision (1,428) 277 255 954
Balance at end of period 34,160 32,908 34,160 32,908
Commercial Real Estate        
Activity in allowance for loan losses        
Balance at beginning of period 18,260 15,698 18,489 16,320
Recoveries 42 58 3,288 298
Increase (decrease) in Provision 221 2,618 (3,254) 1,756
Balance at end of period 18,523 18,374 18,523 18,374
Construction        
Activity in allowance for loan losses        
Balance at beginning of period 4,636 3,626 3,793 4,725
Increase (decrease) in Provision 596 (380) 1,439 (1,479)
Balance at end of period 5,232 3,246 5,232 3,246
Lease Financing        
Activity in allowance for loan losses        
Balance at beginning of period 780 1,008 888 1,089
Recoveries   1 1 2
Increase (decrease) in Provision (55) (39) (164) (121)
Balance at end of period 725 970 725 970
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   0  
Activity in allowance for loan losses        
Balance at beginning of period 46,452 45,686 46,099 44,858
Charge-offs (268) (484) (796) (561)
Recoveries 350 608 1,116 2,098
Increase (decrease) in Provision (492) 17 (377) (568)
Balance at end of period 46,042 45,827 46,042 45,827
Consumer        
Activity in allowance for loan losses        
Balance at beginning of period 28,386 26,840 28,385 27,041
Charge-offs (4,878) (4,871) (13,379) (13,481)
Recoveries 1,523 1,530 4,731 4,773
Increase (decrease) in Provision 3,183 3,916 8,477 9,082
Balance at end of period 28,214 27,415 28,214 27,415
Unallocated        
Activity in allowance for loan losses        
Balance at beginning of period 2,054 10,566 3,805 8,931
Increase (decrease) in Provision 75 (3,859) (1,676) (2,224)
Balance at end of period $ 2,129 $ 6,707 $ 2,129 $ 6,707