Loans and Allowance for Lease and Loan Losses (Schedule of classes of the loan portfolio by the aging categories of performing loans and nonaccrual loans) (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 771,913,000	$ 664,580,000
Total gross loans	789,517,000	677,006,000
Nonaccrual	8,921,000	5,672,000
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	7,961,000	7,030,000
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,631,000	1,813,000
Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	7,012,000	3,583,000
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	268,640,000	223,030,000
Commercial real estate | Undisbursed construction loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	20,354,000	12,870,000
Total gross loans	20,354,000	12,870,000
Commercial real estate | Non-residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	222,953,000	193,273,000
Total gross loans	228,157,000	197,499,000
Nonaccrual	3,911,000	2,507,000
Commercial real estate | Non-residential | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	409,000	1,466,000
Commercial real estate | Non-residential | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	884,000	253,000
Commercial real estate | Non-residential | Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	3,911,000	2,507,000
Commercial real estate | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	19,744,000	12,487,000
Total gross loans	20,129,000	12,661,000
Nonaccrual	385,000
Commercial real estate | Multifamily | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		174,000
Commercial real estate | Multifamily | Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	385,000
Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	42,403,000	42,083,000
Total gross loans	43,726,000	43,534,000
Nonaccrual	2,341,000	2,208,000
Residential Real Estate | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	427,000	305,000
Residential Real Estate | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	116,000	615,000
Residential Real Estate | Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	780,000	531,000
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	89,401,000	82,992,000
Total gross loans	90,554,000	83,203,000
Nonaccrual	905,000	297,000
Commercial and industrial | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	288,000	206,000
Commercial and industrial | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	198,000	1,000
Commercial and industrial | Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	667,000	4,000
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	26,028,000	30,095,000
Consumer | Indirect automobile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	351,840,000	291,369,000
Total gross loans	360,569,000	297,144,000
Nonaccrual	953,000	452,000
Consumer | Indirect automobile | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	6,494,000	4,429,000
Consumer | Indirect automobile | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,294,000	915,000
Consumer | Indirect automobile | Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	941,000	431,000
Consumer | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	15,726,000	18,905,000
Total gross loans	16,276,000	19,269,000
Nonaccrual	415,000	198,000
Consumer | Home equity | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	142,000	264,000
Consumer | Home equity | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	91,000
Consumer | Home equity | Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	317,000	100,000
Consumer | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	9,492,000	10,601,000
Total gross loans	9,752,000	10,826,000
Nonaccrual	11,000	10,000
Consumer | Other consumer | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	201,000	186,000
Consumer | Other consumer | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	48,000	29,000
Consumer | Other consumer | Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 11,000	$ 10,000