Loans (Allowance for Credit Losses on Financing Receivables) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Allowance for loan losses:
Beginning Balance			$ 10,976	$ 10,515
Charge-offs	$ (144)	$ (219)	(1,219)	(963)
Recoveries	28	193	170	247
Provisions	450	40	1,325	940
Ending Balance	11,252	10,739	11,252	10,739
Commercial Real Estate Portfolio Segment [Member]
Allowance for loan losses:
Beginning Balance			6,882	6,451
Charge-offs	(144)	(32)	(148)	(268)
Recoveries	0	2	15	8
Provisions	238	179	354	521
Ending Balance	7,103	6,712	7,103	6,712
Residential First Mortgages Portfolio Segment [Member]
Allowance for loan losses:
Beginning Balance			755	1,144
Charge-offs		(2)		(115)
Provisions	(80)	(44)	(126)	(338)
Ending Balance	629	691	629	691
Residential Rentals Portfolio Segment [Member]
Allowance for loan losses:
Beginning Balance			498	512
Charge-offs		(54)	(53)	(54)
Recoveries			46
Provisions	(51)	170	(84)	127
Ending Balance	407	585	407	585
Construction And Land Development Portfolio Segment [Member]
Allowance for loan losses:
Beginning Balance			310	462
Charge-offs	0		(329)
Provisions	(52)	(203)	213	(167)
Ending Balance	194	295	194	295
Home Equity And Second Mortgage Loans [Member]
Allowance for loan losses:
Beginning Balance			133	162
Charge-offs		0		(7)
Recoveries	1	2	5	16
Provisions	(7)	71	(13)	6
Ending Balance	125	177	125	177
Commercial Portfolio Segment [Member]
Allowance for loan losses:
Beginning Balance			1,482	1,013
Charge-offs		2		(86)
Recoveries	10	176	20	176
Provisions	189	(167)	99	111
Ending Balance	1,601	1,214	1,601	1,214
Consumer Portfolio Segment [Member]
Allowance for loan losses:
Beginning Balance			6	7
Charge-offs		(1)	(4)	(2)
Recoveries	0		2
Provisions	(1)	(1)	4	0
Ending Balance	8	5	8	5
Commercial Equipment Portfolio Segment [Member]
Allowance for loan losses:
Beginning Balance			910	764
Charge-offs		(132)	(685)	(431)
Recoveries	17	13	82	47
Provisions	214	35	878	680
Ending Balance	$ 1,185	$ 1,060	$ 1,185	$ 1,060