Allowance for Loan Losses and Credit Quality of Loans, Troubled Debt Restructurings (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) Contract	Dec. 31, 2018 USD ($) Contract
Troubled Debt Restructured Loans [Abstract]
Number of contracts | Contract	37	46
Pre-modification outstanding recorded investment	$ 2,508	$ 2,285
Post-modification outstanding recorded investment	$ 2,603	$ 2,280
Number of contracts | Contract	55	66
Recorded Investment	$ 2,606	$ 4,055
Commercial Loans [Member]
Troubled Debt Restructured Loans [Abstract]
Number of contracts | Contract	5	5
Pre-modification outstanding recorded investment	$ 892	$ 581
Post-modification outstanding recorded investment	$ 898	$ 581
Number of contracts | Contract	0	3
Recorded Investment	$ 0	$ 338
Commercial Loans [Member] | C&I [Member]
Troubled Debt Restructured Loans [Abstract]
Number of contracts | Contract	1
Pre-modification outstanding recorded investment	$ 65
Post-modification outstanding recorded investment	$ 65
Commercial Loans [Member] | CRE [Member]
Troubled Debt Restructured Loans [Abstract]
Number of contracts | Contract	1
Pre-modification outstanding recorded investment	$ 402
Post-modification outstanding recorded investment	$ 402
Commercial Loans [Member] | Business Banking [Member]
Troubled Debt Restructured Loans [Abstract]
Number of contracts | Contract	3	5
Pre-modification outstanding recorded investment	$ 425	$ 581
Post-modification outstanding recorded investment	$ 431	$ 581
Number of contracts | Contract	0	3
Recorded Investment	$ 0	$ 338
Consumer Loans [Member]
Troubled Debt Restructured Loans [Abstract]
Number of contracts | Contract	20	27
Pre-modification outstanding recorded investment	$ 584	$ 605
Post-modification outstanding recorded investment	$ 614	$ 601
Number of contracts | Contract	32	37
Recorded Investment	$ 1,403	$ 1,931
Consumer Loans [Member] | Indirect Auto [Member]
Troubled Debt Restructured Loans [Abstract]
Number of contracts | Contract	9	17
Pre-modification outstanding recorded investment	$ 134	$ 204
Post-modification outstanding recorded investment	$ 134	$ 202
Number of contracts | Contract	3	0
Recorded Investment	$ 18	$ 0
Consumer Loans [Member] | Direct [Member]
Troubled Debt Restructured Loans [Abstract]
Number of contracts | Contract	11	10
Pre-modification outstanding recorded investment	$ 450	$ 401
Post-modification outstanding recorded investment	$ 480	$ 399
Number of contracts | Contract	29	37
Recorded Investment	$ 1,385	$ 1,931
Residential Real Estate [Member]
Troubled Debt Restructured Loans [Abstract]
Number of contracts | Contract	12	14
Pre-modification outstanding recorded investment	$ 1,032	$ 1,099
Post-modification outstanding recorded investment	$ 1,091	$ 1,098
Number of contracts | Contract	23	26
Recorded Investment	$ 1,203	$ 1,786