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Loans, Allowance for Loan Losses and Credit Quality (Modifications which occurred during the period & change in recorded investment) (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
contract
Mar. 31, 2017
USD ($)
contract
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Number of Contracts | contract 3 12
TROUBLED DEBT RESTRUCTURINGS:    
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 687 $ 1,297
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 687 $ 1,297 [1]
Commercial and Industrial [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Number of Contracts | contract   2
TROUBLED DEBT RESTRUCTURINGS:    
Financing Receivable, Modifications, Pre-Modification Recorded Investment   $ 80
Financing Receivable, Modifications, Post-Modification Recorded Investment [1]   $ 80
Commercial Real Estate [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Number of Contracts | contract 1 4
TROUBLED DEBT RESTRUCTURINGS:    
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 445 $ 934
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 445 $ 934 [1]
Small Business [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Number of Contracts | contract   4
TROUBLED DEBT RESTRUCTURINGS:    
Financing Receivable, Modifications, Pre-Modification Recorded Investment   $ 143
Financing Receivable, Modifications, Post-Modification Recorded Investment [1]   $ 143
Consumer Home Equity [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Number of Contracts | contract 2 2
TROUBLED DEBT RESTRUCTURINGS:    
Financing Receivable, Modifications, Pre-Modification Recorded Investment $ 242 $ 140
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 242 $ 140 [1]
[1] The post-modification balances represent the legal principal balance of the loan on the date of modification. These amounts may show an increase when modifications include a capitalization of interest.