Loans and Allowance for Loan Losses (Allowance for Loan Losses by Commercial and Consumer Portfolio Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Financing Receivable, Allowance For Credit Losses [Roll Forward]
Balance, beginning of period	$ 16,144	$ 16,100	$ 15,762	$ 15,523
Provision for loan losses	650	400	1,250	1,300
Loan charge-offs	(963)	(556)	(1,240)	(1,159)
Loan recoveries	17	196	76	476
Net loan charge-offs	(946)	(360)	(1,164)	(683)
Balance, end of period	$ 15,848	$ 16,140	$ 15,848	$ 16,140
Net charge-offs to average loans (annualized)	0.21%	0.09%	0.09%	0.06%
Allowance for loan losses to gross loans	0.86%	1.00%
Allowance for loan losses to nonperforming loans	225.51%	270.53%
Commercial Loan [Member]
Financing Receivable, Allowance For Credit Losses [Roll Forward]
Balance, beginning of period			$ 10,768
Balance, end of period	$ 10,777		10,777
Commercial Loan [Member] | Owner Occupied Re [Member]
Financing Receivable, Allowance For Credit Losses [Roll Forward]
Balance, beginning of period	2,808	$ 2,699	2,726	$ 2,534
Provision for loan losses	(75)	71	117	236
Loan charge-offs			(110)
Loan recoveries
Net loan charge-offs			(110)
Balance, end of period	2,733	2,770	2,733	2,770
Commercial Loan [Member] | Non Owner Occupied Re [Member]
Financing Receivable, Allowance For Credit Losses [Roll Forward]
Balance, beginning of period	4,016	3,581	3,811	3,230
Provision for loan losses	237	379	454	857
Loan charge-offs	(225)		(239)	(234)
Loan recoveries		25	2	132
Net loan charge-offs	(225)	25	(237)	(102)
Balance, end of period	4,028	3,985	4,028	3,985
Commercial Loan [Member] | Business Loan [Member]
Financing Receivable, Allowance For Credit Losses [Roll Forward]
Balance, beginning of period	3,623	3,849	3,616	3,848
Provision for loan losses	588	(17)	577	(31)
Loan charge-offs	(709)	(536)	(709)	(655)
Loan recoveries	8	89	26	223
Net loan charge-offs	(701)	(447)	(683)	(432)
Balance, end of period	3,510	3,385	3,510	3,385
Commercial Loan [Member] | Construction Loans [Member]
Financing Receivable, Allowance For Credit Losses [Roll Forward]
Balance, beginning of period	569	544	615	325
Provision for loan losses	(63)	(44)	(109)	175
Loan charge-offs
Loan recoveries
Net loan charge-offs
Balance, end of period	506	500	506	500
Consumer Loan [Member]
Financing Receivable, Allowance For Credit Losses [Roll Forward]
Balance, beginning of period			4,994
Balance, end of period	5,071		5,071
Consumer Loan [Member] | Other Consumer [Member]
Financing Receivable, Allowance For Credit Losses [Roll Forward]
Balance, beginning of period	297	268	290	281
Provision for loan losses	34	22	85	41
Loan charge-offs	(29)	(20)	(82)	(54)
Loan recoveries	1	1	10	3
Net loan charge-offs	(28)	(19)	(72)	(51)
Balance, end of period	303	271	303	271
Consumer Loan [Member] | Construction Loans [Member]
Financing Receivable, Allowance For Credit Losses [Roll Forward]
Balance, beginning of period	318	282	275	210
Provision for loan losses	8	(7)	51	65
Loan charge-offs
Loan recoveries
Net loan charge-offs
Balance, end of period	326	275	326	275
Consumer Loan [Member] | Real Estate Loan [Member]
Financing Receivable, Allowance For Credit Losses [Roll Forward]
Balance, beginning of period	3,104	3,446	3,081	3,495
Provision for loan losses	(93)	89	(99)	114
Loan charge-offs				(76)
Loan recoveries	7	1	36	3
Net loan charge-offs	7	1	36	(73)
Balance, end of period	3,018	3,536	3,018	3,536
Consumer Loan [Member] | Home Equity Loan [Member]
Financing Receivable, Allowance For Credit Losses [Roll Forward]
Balance, beginning of period	1,409	1,431	1,348	1,600
Provision for loan losses	14	(93)	174	(157)
Loan charge-offs			(100)	(140)
Loan recoveries	1	80	2	115
Net loan charge-offs	1	80	(98)	(25)
Balance, end of period	$ 1,424	$ 1,418	$ 1,424	$ 1,418