Loans, Allowance for Loan Losses and Credit Quality (Textual) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 0
Unamortized Loan Commitment and Origination fees	$ 6,400,000		$ 6,100,000
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	$ 5,637,000		6,067,000
Unamortized Discounts or Premiums	$ 9,100,000		$ 9,400,000