Loans (Allowance for Credit Losses on Financing Receivables) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Allowance for loan losses:
Beginning Balance	$ 10,942	$ 10,976
Charge-offs	0	(742)
Recoveries	19	112
Provisions	4,100	500
Ending Balance	15,061	10,846
Commercial Real Estate Portfolio Segment [Member]
Allowance for loan losses:
Beginning Balance	7,398	6,882
Charge-offs	0	0
Recoveries	0	2
Provisions	1,685	(142)
Ending Balance	9,083	6,742
Residential First Mortgages Portfolio Segment [Member]
Allowance for loan losses:
Beginning Balance	464	755
Charge-offs	0	0
Recoveries	0	0
Provisions	398	(33)
Ending Balance	862	722
Residential Rentals Portfolio Segment [Member]
Allowance for loan losses:
Beginning Balance	397	498
Charge-offs	0	(53)
Recoveries	0	46
Provisions	305	(29)
Ending Balance	702	462
Construction And Land Development Portfolio Segment [Member]
Allowance for loan losses:
Beginning Balance	273	310
Charge-offs	0	0
Recoveries	0	0
Provisions	163	(162)
Ending Balance	436	148
Home Equity And Second Mortgage Loans [Member]
Allowance for loan losses:
Beginning Balance	149	133
Charge-offs	0	0
Recoveries	1	2
Provisions	108	(3)
Ending Balance	258	132
Commercial Portfolio Segment [Member]
Allowance for loan losses:
Beginning Balance	1,086	1,482
Charge-offs	0	0
Recoveries	5	5
Provisions	1,175	(81)
Ending Balance	2,266	1,406
Consumer Portfolio Segment [Member]
Allowance for loan losses:
Beginning Balance	10	6
Charge-offs	0	(4)
Recoveries	0	1
Provisions	5	5
Ending Balance	15	8
Commercial Equipment Portfolio Segment [Member]
Allowance for loan losses:
Beginning Balance	1,165	910
Charge-offs	0	(685)
Recoveries	13	56
Provisions	261	945
Ending Balance	$ 1,439	$ 1,226