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Allowance for Loan and Lease Losses - Loans by Class Modified as Troubled Debt Restructurings (Details) - Originated Loans and Leases
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
loan
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 6 15
Pre-Modification Outstanding Recorded Investment $ 716 $ 2,439
Post- Modification Outstanding Recorded Investment $ 716 $ 2,439
Number of Loans TDRs | loan 1 1
Post- Modification Outstanding Recorded Investment TDRs $ 55 $ 1,800
Commercial and industrial | Other    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan   2
Pre-Modification Outstanding Recorded Investment   $ 1,115
Post- Modification Outstanding Recorded Investment   $ 1,115
Number of Loans TDRs | loan   0
Post- Modification Outstanding Recorded Investment TDRs   $ 0
Commercial real estate | Other    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan   1
Pre-Modification Outstanding Recorded Investment   $ 50
Post- Modification Outstanding Recorded Investment   $ 50
Number of Loans TDRs | loan   1
Post- Modification Outstanding Recorded Investment TDRs   $ 1,800
Residential real estate | Home equity    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 6 12
Pre-Modification Outstanding Recorded Investment $ 716 $ 1,274
Post- Modification Outstanding Recorded Investment $ 716 $ 1,274
Number of Loans TDRs | loan 1 0
Post- Modification Outstanding Recorded Investment TDRs $ 55 $ 0