Loans, Allowance for Loan Losses and Credit Quality (Textual) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 205,000	$ 0	$ 205,000
Unamortized Loan Commitment and Origination fees	6,900,000		$ 6,900,000		$ 6,100,000
Document Period End Date			Sep. 30, 2018
Significant Advanced Considered For Risk Rating Change			$ 50,000
Days to be termed as non accrual loans			90 days
Tdrs Recorded Investment On Nonaccrual Status	3,370,000		$ 3,370,000		6,067,000
Unamortized Discounts or Premiums	$ 8,600,000		$ 8,600,000		$ 9,400,000