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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		9 Months Ended	12 Months Ended
	Sep. 30, 2016 USD ($) contract	Sep. 30, 2015 USD ($) contract	Sep. 30, 2016 USD ($) contract	Dec. 31, 2015 USD ($) contract
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	8	7	37	32
TROUBLED DEBT RESTRUCTURINGS:
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 1,373	$ 1,110	$ 4,931	$ 5,012
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,373	$ 1,137	$ 4,973	$ 5,039
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	0	1	7	10
TROUBLED DEBT RESTRUCTURINGS:
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0	$ 100	$ 528	$ 1,153
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 100	$ 528	$ 1,153
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	3	1	9	6
TROUBLED DEBT RESTRUCTURINGS:
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 986	$ 653	$ 2,329	$ 2,963
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 986	$ 653	$ 2,329	$ 2,963
Small Business [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	1	2	3	7
TROUBLED DEBT RESTRUCTURINGS:
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 59	$ 103	$ 168	$ 269
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 59	$ 103	$ 168	$ 269
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	0	2	5	5
TROUBLED DEBT RESTRUCTURINGS:
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0	$ 218	$ 1,167	$ 376
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 245	$ 1,209	$ 403
Consumer - Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	4	1	8	4
TROUBLED DEBT RESTRUCTURINGS:
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 328	$ 36	$ 632	$ 251
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 328	$ 36	$ 632	$ 251
Consumer - Other [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | contract	0		5
TROUBLED DEBT RESTRUCTURINGS:
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0		$ 107
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0		$ 107

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
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-Topic 310
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