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Loans, Nonaccrual Loans Segregated by Class of Loans and Loan Portfolio Aging Analysis, Segregated by Class (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Nonaccrual loans segregated by class of loans		$ 11,867	$ 18,119
Total Past Due		43,546	45,403
Current		3,165,092	3,077,537
Total Loans		3,208,638	3,122,940
90+ and Accruing	[1]	10,198	10,176
Minimum threshold amount of loans requiring performance bond		500
30-59 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		15,378	13,401
60-89 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		8,970	8,632
90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		19,198	23,370
Commercial [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Loans		1,644,746	1,619,235
Commercial [Member] | Construction [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Nonaccrual loans segregated by class of loans		639	1,207
Total Past Due		843	1,376
Current		81,872	75,103
Total Loans		82,715	76,479
90+ and Accruing	[1]	58	31
Commercial [Member] | Construction [Member] | 30-59 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		87	138
Commercial [Member] | Construction [Member] | 60-89 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		58	0
Commercial [Member] | Construction [Member] | 90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		698	1,238
Commercial [Member] | Real Estate [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Nonaccrual loans segregated by class of loans		4,537	7,028
Total Past Due		16,267	14,160
Current		1,166,826	1,174,520
Total Loans		1,183,093	1,188,680
90+ and Accruing	[1]	4,632	2,665
Commercial [Member] | Real Estate [Member] | 30-59 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		6,287	4,047
Commercial [Member] | Real Estate [Member] | 60-89 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		1,204	1,599
Commercial [Member] | Real Estate [Member] | 90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		8,776	8,514
Commercial [Member] | Equipment Lease Financing [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		0	430
Current		1,740	2,612
Total Loans		1,740	3,042
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	430
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]
Nonaccrual loans segregated by class of loans		797	934
Total Past Due		2,218	1,564
Current		374,980	349,470
Total Loans		377,198	351,034
90+ and Accruing	[1]	581	87
Commercial [Member] | Other [Member] | 30-59 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		1,057	835
Commercial [Member] | Other [Member] | 60-89 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		94	77
Commercial [Member] | Other [Member] | 90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		1,067	652
Residential [Member] | Construction [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Nonaccrual loans segregated by class of loans		22	318
Total Past Due		610	649
Current		56,550	66,709
Total Loans		57,160	67,358
90+ and Accruing	[1]	6	223
Residential [Member] | Construction [Member] | 30-59 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		144	224
Residential [Member] | Construction [Member] | 60-89 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		438	202
Residential [Member] | Construction [Member] | 90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		28	223
Residential [Member] | Real Estate [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Nonaccrual loans segregated by class of loans		5,395	8,243
Total Past Due		14,524	18,698
Current		707,893	690,872
Total Loans		722,417	709,570
90+ and Accruing	[1]	4,095	6,293
Residential [Member] | Real Estate [Member] | 30-59 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		1,272	2,064
Residential [Member] | Real Estate [Member] | 60-89 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		5,645	5,029
Residential [Member] | Real Estate [Member] | 90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		7,607	11,605
Residential [Member] | Home Equity [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Nonaccrual loans segregated by class of loans		477	389
Total Past Due		1,704	1,201
Current		104,595	98,155
Total Loans		106,299	99,356
90+ and Accruing	[1]	246	167
Residential [Member] | Home Equity [Member] | 30-59 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		898	595
Residential [Member] | Home Equity [Member] | 60-89 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		365	178
Residential [Member] | Home Equity [Member] | 90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		441	428
Consumer [Member] | Consumer Direct [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		1,183	1,193
Current		143,106	136,561
Total Loans		144,289	137,754
90+ and Accruing	[1]	74	62
Consumer [Member] | Consumer Direct [Member] | 30-59 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		918	983
Consumer [Member] | Consumer Direct [Member] | 60-89 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		191	148
Consumer [Member] | Consumer Direct [Member] | 90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		74	62
Consumer [Member] | Consumer Indirect [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		6,197	6,132
Current		527,530	483,535
Total Loans		533,727	489,667
90+ and Accruing	[1]	506	648
Consumer [Member] | Consumer Indirect [Member] | 30-59 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		4,715	4,085
Consumer [Member] | Consumer Indirect [Member] | 60-89 Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		975	1,399
Consumer [Member] | Consumer Indirect [Member] | 90+ Days Past Due [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Past Due		$ 507	$ 648
[1] 90+ and Accruing are also included in 90+ Days Past Due column.

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Minimum threshold amount of loans requiring a performance bond to be posted by the general contractor to assure completion of the project.

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Recorded investment in financing receivables that are 90 days or more past due and still accruing.

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Financing receivables that are current.

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