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Loans, Loan Portfolio Aging Analysis, Segregated by Class (Details) - USD ($)		Dec. 31, 2019	Dec. 31, 2018
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		$ 55,255,000	$ 43,546,000
Current		3,193,409,000	3,165,092,000
Total Loans		3,248,664,000	3,208,638,000
90+ and Accruing	[1]	19,620,000	10,198,000
Minimum threshold amount of loans requiring performance bond		500,000
30-59 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		10,689,000	15,378,000
60-89 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		13,232,000	8,970,000
90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		31,334,000	19,198,000
Commercial [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Loans		1,664,948,000	1,644,746,000
Commercial [Member] | Construction [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		585,000	843,000
Current		104,224,000	81,872,000
Total Loans		104,809,000	82,715,000
90+ and Accruing	[1]	237,000	58,000
Commercial [Member] | Construction [Member] | 30-59 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		118,000	87,000
Commercial [Member] | Construction [Member] | 60-89 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		0	58,000
Commercial [Member] | Construction [Member] | 90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		467,000	698,000
Commercial [Member] | Real Estate [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		21,069,000	16,267,000
Current		1,148,906,000	1,166,826,000
Total Loans		1,169,975,000	1,183,093,000
90+ and Accruing	[1]	8,820,000	4,632,000
Commercial [Member] | Real Estate [Member] | 30-59 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		2,734,000	6,287,000
Commercial [Member] | Real Estate [Member] | 60-89 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		5,969,000	1,204,000
Commercial [Member] | Real Estate [Member] | 90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		12,366,000	8,776,000
Commercial [Member] | Equipment Lease Financing [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		0	0
Current		481,000	1,740,000
Total Loans		481,000	1,740,000
90+ and Accruing	[1]	0	0
Commercial [Member] | Equipment Lease Financing [Member] | 30-59 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		0	0
Commercial [Member] | Equipment Lease Financing [Member] | 60-89 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		0	0
Commercial [Member] | Equipment Lease Financing [Member] | 90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		0	0
Commercial [Member] | Other [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		7,431,000	2,218,000
Current		382,252,000	374,980,000
Total Loans		389,683,000	377,198,000
90+ and Accruing	[1]	2,586,000	581,000
Commercial [Member] | Other [Member] | 30-59 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		880,000	1,057,000
Commercial [Member] | Other [Member] | 60-89 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		284,000	94,000
Commercial [Member] | Other [Member] | 90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		6,267,000	1,067,000
Residential [Member] | Construction [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		803,000	610,000
Current		62,547,000	56,550,000
Total Loans		63,350,000	57,160,000
90+ and Accruing	[1]	0	6,000
Residential [Member] | Construction [Member] | 30-59 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		117,000	144,000
Residential [Member] | Construction [Member] | 60-89 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		52,000	438,000
Residential [Member] | Construction [Member] | 90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		634,000	28,000
Residential [Member] | Real Estate [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		16,470,000	14,524,000
Current		716,533,000	707,893,000
Total Loans		733,003,000	722,417,000
90+ and Accruing	[1]	7,088,000	4,095,000
Residential [Member] | Real Estate [Member] | 30-59 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		774,000	1,272,000
Residential [Member] | Real Estate [Member] | 60-89 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		5,376,000	5,645,000
Residential [Member] | Real Estate [Member] | 90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		10,320,000	7,607,000
Residential [Member] | Home Equity [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		2,232,000	1,704,000
Current		109,662,000	104,595,000
Total Loans		111,894,000	106,299,000
90+ and Accruing	[1]	344,000	246,000
Residential [Member] | Home Equity [Member] | 30-59 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		1,084,000	898,000
Residential [Member] | Home Equity [Member] | 60-89 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		412,000	365,000
Residential [Member] | Home Equity [Member] | 90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		736,000	441,000
Consumer [Member] | Consumer Direct [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		1,272,000	1,183,000
Current		146,779,000	143,106,000
Total Loans		148,051,000	144,289,000
90+ and Accruing	[1]	97,000	74,000
Consumer [Member] | Consumer Direct [Member] | 30-59 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		945,000	918,000
Consumer [Member] | Consumer Direct [Member] | 60-89 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		230,000	191,000
Consumer [Member] | Consumer Direct [Member] | 90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		97,000	74,000
Consumer [Member] | Consumer Indirect [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		5,393,000	6,197,000
Current		522,025,000	527,530,000
Total Loans		527,418,000	533,727,000
90+ and Accruing	[1]	448,000	506,000
Consumer [Member] | Consumer Indirect [Member] | 30-59 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		4,037,000	4,715,000
Consumer [Member] | Consumer Indirect [Member] | 60-89 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		909,000	975,000
Consumer [Member] | Consumer Indirect [Member] | 90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		$ 447,000	$ 507,000
[1] 90+ and Accruing are also included in 90+ Days Past Due column.

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