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Allowance for Loan and Lease Losses - Troubled Debt Restructuring Modifications (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
property
contract
Dec. 31, 2015
USD ($)
property
contract
Dec. 31, 2014
USD ($)
contract
Troubled debt restructuring modifications      
Number of Contracts | contract 25 30 43
Recorded Investment $ 29,801 $ 29,443 $ 39,927
Related Allowance 618 592 $ 792
Total loan and lease commitments 5,121,811 5,192,874  
Commitments related to borrowers who had loan terms modified in a TDR $ 6,900 $ 0  
Loans modified in TDRs that experienced a payment default      
Period past due for payment default 30 days    
Number of contracts | contract 1 10 8
Recorded Investment $ 1,399 $ 8,434 $ 2,789
Number of residential mortgage loans collateralized by real estate property and modified in a TDR in the process of foreclosure | contract 1 4  
Residential mortgage loans collateralized by real estate property and modified in a TDR in the process of foreclosure $ 500 $ 1,300  
Commercial and Industrial      
Troubled debt restructuring modifications      
Number of Contracts | contract 7 5 5
Recorded Investment $ 14,933 $ 11,888 $ 13,791
Related Allowance 377    
Total loan and lease commitments $ 2,185,810 $ 2,262,712  
Loans modified in TDRs that experienced a payment default      
Number of contracts | contract   3 1
Recorded Investment   $ 6,153 $ 299
Number of contracts that were refinanced | contract   3  
Commercial Real Estate      
Troubled debt restructuring modifications      
Number of Contracts | contract 6 4 6
Recorded Investment $ 9,709 $ 5,649 $ 4,529
Related Allowance $ 7   $ 52
Loans modified in TDRs that experienced a payment default      
Number of contracts | contract 1    
Recorded Investment $ 1,399    
Construction      
Troubled debt restructuring modifications      
Number of Contracts | contract     2
Recorded Investment     $ 4,579
Lease Financing      
Troubled debt restructuring modifications      
Short-term forbearance period after which missed payments are added to end of lease term 3 months    
Total loan and lease commitments $ 16 $ 104  
Residential      
Troubled debt restructuring modifications      
Period of time monthly payments are lowered to accommodate borrowers' financial needs 2 years    
Number of Contracts | contract 12 21 30
Recorded Investment $ 5,159 $ 11,906 $ 17,028
Related Allowance $ 234 $ 592 $ 740
Loans modified in TDRs that experienced a payment default      
Number of contracts | contract   7 7
Recorded Investment   $ 2,281 $ 2,490
Number of contracts that were modified by reducing interest rates, increasing amortizations, and deferring principal payments | contract   7 7
Residential | Real estate property held from foreclosed TDR      
Loans modified in TDRs that experienced a payment default      
Number of real estate properties | property 1 0  
Real estate property held from a foreclosed TDR $ 300    
Consumer      
Troubled debt restructuring modifications      
Total loan and lease commitments $ 1,459,467 $ 1,448,336  
Consumer | Minimum      
Troubled debt restructuring modifications      
Threshold period past due for charge-off 120 days    
Consumer | Maximum      
Troubled debt restructuring modifications      
Threshold period past due for charge-off 180 days