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Allowance for Loan and Lease Losses - Troubled Debt Restructuring Modifications (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
property
contract
Dec. 31, 2016
USD ($)
property
contract
Dec. 31, 2015
USD ($)
contract
Troubled debt restructuring modifications      
Number of Contracts | contract 3 25 30
Recorded Investment $ 1,734 $ 29,801 $ 29,443
Related Allowance 23 618 $ 592
Total loan and lease commitments 5,401,763 5,121,811  
Commitments related to borrowers who had loan terms modified in a TDR $ 1,900 $ 6,900  
Loans modified in TDRs that experienced a payment default      
Period past due for payment default 30 days    
Number of contracts | contract 2 1 10
Recorded Investment $ 3,873 $ 1,399 $ 8,434
Number of residential mortgage loans collateralized by real estate property and modified in a TDR in the process of foreclosure | contract 1 1  
Residential mortgage loans collateralized by real estate property and modified in a TDR in the process of foreclosure $ 300 $ 500  
Commercial and Industrial      
Troubled debt restructuring modifications      
Number of Contracts | contract 1 7 5
Recorded Investment $ 1,075 $ 14,933 $ 11,888
Related Allowance   377  
Total loan and lease commitments $ 2,406,261 $ 2,185,810  
Loans modified in TDRs that experienced a payment default      
Number of contracts | contract 1   3
Recorded Investment $ 2,480   $ 6,153
Number of contracts that were refinanced | contract     3
Commercial Real Estate      
Troubled debt restructuring modifications      
Number of Contracts | contract   6 4
Recorded Investment   $ 9,709 $ 5,649
Related Allowance   $ 7  
Loans modified in TDRs that experienced a payment default      
Number of contracts | contract 1 1  
Recorded Investment $ 1,393 $ 1,399  
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  
Residential      
Troubled debt restructuring modifications      
Period of time monthly payments are lowered to accommodate borrowers' financial needs 2 years    
Number of Contracts | contract 2 12 21
Recorded Investment $ 659 $ 5,159 $ 11,906
Related Allowance $ 23 $ 234 $ 592
Loans modified in TDRs that experienced a payment default      
Number of contracts | contract     7
Recorded Investment     $ 2,281
Number of contracts that were modified by reducing interest rates, increasing amortizations, and deferring principal payments | contract     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 1  
Real estate property held from a foreclosed TDR $ 300 $ 300  
Consumer      
Troubled debt restructuring modifications      
Total loan and lease commitments $ 1,485,588 $ 1,459,467  
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