Loans and Allowance for Credit Losses (Allowance for Credit Losses on Financing Receivables) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Allowance for credit losses allocated to:
Beginning balance	$ 10,507	$ 10,343
Charge-offs	(551)	(210)
Recoveries	72	185
Net charge-offs	(479)	(25)
Provision	350	100
Ending balance	10,378	10,418
Commercial and Residential Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Allowance for credit losses allocated to:
Beginning balance	1,576	2,662
Recoveries	3	3
Net charge-offs	3	3
Provision	(451)	(8)
Ending balance	1,128	2,657
Residential Portfolio Segment [Member]
Allowance for credit losses allocated to:
Beginning balance	2,501	2,353
Charge-offs	(191)	(123)
Recoveries	3	8
Net charge-offs	(188)	(115)
Provision	169	195
Ending balance	2,482	2,433
Commercial Real Estate Portfolio Segment [Member]
Allowance for credit losses allocated to:
Beginning balance	4,032	3,077
Charge-offs	(271)
Recoveries	1	99
Net charge-offs	(270)	99
Provision	203	(119)
Ending balance	3,965	3,057
Commercial Portfolio Segment [Member]
Allowance for credit losses allocated to:
Beginning balance	1,929	1,949
Charge-offs	(82)	(81)
Recoveries	63	75
Net charge-offs	(19)	(6)
Provision	353	66
Ending balance	2,263	2,009
Consumer Portfolio Segment [Member]
Allowance for credit losses allocated to:
Beginning balance	469	302
Charge-offs	(7)	(6)
Recoveries	2
Net charge-offs	(5)	(6)
Provision	76	(34)
Ending balance	$ 540	$ 262