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Loan Portfolio and Credit Quality Loans Restructured in Current Quarter (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Loans
Jun. 30, 2017
Loans
Jun. 30, 2018
USD ($)
Loans
Jun. 30, 2017
Loans
Financing Receivable, Modifications [Line Items]        
Financing Receivable, Modifications, Number of Contracts | Loans 1 0 1 0
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 100   $ 100  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 100   $ 100  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | Loans 0 0 0 0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0   $ 0  
Commercial and industrial [Member]        
Financing Receivable, Modifications [Line Items]        
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | Loans 0      
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0      
Commercial and industrial [Member] | Extended Maturity [Member]        
Financing Receivable, Modifications [Line Items]        
Financing Receivable, Modifications, Number of Contracts | Loans 1      
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 100      
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 100      
Commercial and Industrial Portfolio Segment [Member]        
Financing Receivable, Modifications [Line Items]        
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | Loans     0  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment     $ 0  
Commercial and Industrial Portfolio Segment [Member] | Extended Maturity [Member]        
Financing Receivable, Modifications [Line Items]        
Financing Receivable, Modifications, Number of Contracts | Loans     1  
Financing Receivable, Modifications, Pre-Modification Recorded Investment     $ 100  
Financing Receivable, Modifications, Post-Modification Recorded Investment     $ 100  
Commercial real estate [Member]        
Financing Receivable, Modifications [Line Items]        
Financing Receivable, Modifications, Number of Contracts | Loans 0   0  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 0   $ 0  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0   $ 0  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | Loans 0   0  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0   $ 0  
Construction and land [Member]        
Financing Receivable, Modifications [Line Items]        
Financing Receivable, Modifications, Number of Contracts | Loans 0   0  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 0   $ 0  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0   $ 0  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | Loans 0   0  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0   $ 0  
Residential [Member]        
Financing Receivable, Modifications [Line Items]        
Financing Receivable, Modifications, Number of Contracts | Loans 0   0  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 0   $ 0  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0   $ 0  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | Loans 0   0  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0   $ 0  
Home equity [Member]        
Financing Receivable, Modifications [Line Items]        
Financing Receivable, Modifications, Number of Contracts | Loans 0   0  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 0   $ 0  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0   $ 0  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | Loans 0   0  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0   $ 0  
Consumer and other [Member]        
Financing Receivable, Modifications [Line Items]        
Financing Receivable, Modifications, Number of Contracts | Loans 0   0  
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 0   $ 0  
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 0   $ 0  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | Loans 0   0  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0   $ 0