Loans and Allowance for Credit Losses (Allowance for Credit Losses on Financing Receivables) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Allowance for credit losses allocated to:
Beginning balance	$ 10,378	$ 10,418	$ 10,507	$ 10,343
Charge-offs	(368)	(407)	(918)	(617)
Recoveries	80	94	151	279
Net charge-offs	(288)	(313)	(767)	(338)
Provision	1,000	200	1,350	300
Ending balance	11,090	10,305	11,090	10,305
Construction Loans [Member]
Allowance for credit losses allocated to:
Beginning balance			1,576	2,662
Charge-offs				(3)
Recoveries			8	7
Net charge-offs			8	4
Provision			(87)	(223)
Ending balance	1,497	2,443	1,497	2,443
Commercial and Residential Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Allowance for credit losses allocated to:
Beginning balance	1,128	2,657
Charge-offs		(3)
Recoveries	5	4
Net charge-offs	5	1
Provision	364	(215)
Ending balance	1,497	2,443	1,497	2,443
Residential Portfolio Segment [Member]
Allowance for credit losses allocated to:
Beginning balance	2,482	2,433	2,501	2,353
Charge-offs		(300)	(191)	(423)
Recoveries	4	3	7	11
Net charge-offs	4	(297)	(184)	(412)
Provision	153	19	322	214
Ending balance	2,639	2,155	2,639	2,155
Commercial Real Estate Portfolio Segment [Member]
Allowance for credit losses allocated to:
Beginning balance	3,965	3,057	4,032	3,077
Charge-offs	(331)		(601)
Recoveries		8		107
Net charge-offs	(331)	8	(601)	107
Provision	463	302	666	183
Ending balance	4,097	3,367	4,097	3,367
Commercial Portfolio Segment [Member]
Allowance for credit losses allocated to:
Beginning balance	2,263	2,009	1,929	1,949
Charge-offs	(37)	(81)	(119)	(162)
Recoveries	61	77	124	152
Net charge-offs	24	(4)	5	(10)
Provision	68	52	421	118
Ending balance	2,355	2,057	2,355	2,057
Consumer Portfolio Segment [Member]
Allowance for credit losses allocated to:
Beginning balance	540	262	469	302
Charge-offs		(23)	(7)	(29)
Recoveries	10	2	12	2
Net charge-offs	10	(21)	5	(27)
Provision	(48)	42	28	8
Ending balance	$ 502	$ 283	$ 502	$ 283