Modification which Occurred During the Period & Change in Recorded Investment(Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) contract	Dec. 31, 2016 USD ($) contract	Dec. 31, 2015 USD ($) contract
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	54	50	44
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 8,130	$ 7,663	$ 6,085
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment	$ 8,175	$ 7,705	$ 6,112
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract		6
Financing Receivable, Modifications, Pre-Modification Recorded Investment		$ 153
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment		$ 153
Home Equity Line of Credit [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	17	13	8
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 1,985	$ 932	$ 694
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment	$ 1,988	$ 932	$ 694
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	10	8	8
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 1,284	$ 1,808	$ 843
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment	$ 1,326	$ 1,850	$ 870
Small Business [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	9	3	9
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 369	$ 188	$ 293
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment	$ 369	$ 188	$ 293
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	6	10	6
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 2,705	$ 2,959	$ 2,941
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment	$ 2,705	$ 2,959	$ 2,941
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	12	10	13
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 1,787	$ 1,623	$ 1,314
TROUBLED DEBT RESTRUCTURINGS:
Post-Modification Outstanding Recorded Investment	$ 1,787	$ 1,623	$ 1,314