Loans, Loan Portfolio Aging Analysis, Segregated by Class (Details) - USD ($)		6 Months Ended
		Jun. 30, 2019	Dec. 31, 2018
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		$ 53,036,000	$ 43,546,000
Current		3,139,171,000	3,165,092,000
Total Loans		3,192,207,000	3,208,638,000
90+ and Accruing	[1]	11,076,000	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		12,180,000	15,378,000
60-89 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		20,249,000	8,970,000
90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		$ 20,607,000	19,198,000
Equipment Lease Financing [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Financing percentage requested for underwriting loans		100.00%
Commercial [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Loans		$ 1,649,549,000	1,644,746,000
Commercial [Member] | Construction [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		632,000	843,000
Current		65,139,000	81,872,000
Total Loans		65,771,000	82,715,000
90+ and Accruing	[1]	36,000	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		56,000	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		30,000	58,000
Commercial [Member] | Construction [Member] | 90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		546,000	698,000
Commercial [Member] | Real Estate [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		26,246,000	16,267,000
Current		1,166,522,000	1,166,826,000
Total Loans		1,192,768,000	1,183,093,000
90+ and Accruing	[1]	5,816,000	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		4,593,000	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		10,933,000	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		10,720,000	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		962,000	1,740,000
Total Loans		962,000	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		4,552,000	2,218,000
Current		385,496,000	374,980,000
Total Loans		390,048,000	377,198,000
90+ and Accruing	[1]	174,000	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		988,000	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		2,742,000	94,000
Commercial [Member] | Other [Member] | 90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		822,000	1,067,000
Residential [Member] | Construction [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		596,000	610,000
Current		56,421,000	56,550,000
Total Loans		57,017,000	57,160,000
90+ and Accruing	[1]	5,000	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		290,000	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		21,000	438,000
Residential [Member] | Construction [Member] | 90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		285,000	28,000
Residential [Member] | Real Estate [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		13,675,000	14,524,000
Current		708,898,000	707,893,000
Total Loans		722,573,000	722,417,000
90+ and Accruing	[1]	4,529,000	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		1,104,000	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		5,170,000	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		7,401,000	7,607,000
Residential [Member] | Home Equity [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		1,609,000	1,704,000
Current		108,222,000	104,595,000
Total Loans		109,831,000	106,299,000
90+ and Accruing	[1]	258,000	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		709,000	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		325,000	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		575,000	441,000
Consumer [Member] | Consumer Direct [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		1,144,000	1,183,000
Current		144,005,000	143,106,000
Total Loans		145,149,000	144,289,000
90+ and Accruing	[1]	40,000	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		926,000	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		178,000	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		40,000	74,000
Consumer [Member] | Consumer Indirect [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		4,582,000	6,197,000
Current		503,506,000	527,530,000
Total Loans		508,088,000	533,727,000
90+ and Accruing	[1]	218,000	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		3,514,000	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		850,000	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		$ 218,000	$ 507,000

[1] 90+ and Accruing are also included in 90+ Days Past Due column.