Loans and Allowance (Activity in Allowance for Loan Losses by Portfolio Segment) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, Beginning of period				$ 12,387				$ 12,382				$ 12,641	$ 12,387	$ 12,382	$ 12,641
Provision charged (credited) to expense	$ 600	$ 570	$ 500	450	$ 350	$ 370	$ 300	200	$ 250	$ 250	$ 150	200	2,120	1,220	850
Losses charged off													(1,466)	(1,412)	(1,482)
Recoveries													240	197	373
Allowance for loan losses, End of period	13,281				12,387				12,382				13,281	12,387	12,382
Allowance for loan losses, individually evaluated for impairment, Ending balance																$ 100	$ 100	$ 100
Allowance for loan losses, collectively evaluated for impairment, Ending balance																13,181	12,287	12,282
Total allowance for loan losses	13,281			12,387	12,387			12,382	12,382			12,641	12,387	12,382	12,641	13,281	12,387	12,382
Loans, individually evaluated for impairment, Ending balance																8,315	3,607	3,757
Loans, collectively evaluated for impairment, Ending balance																1,488,941	1,183,106	1,168,879
Total loans receivable																1,497,256	1,186,713	1,172,636
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, Beginning of period				7,704				7,358				7,090	7,704	7,358	7,090
Provision charged (credited) to expense													914	483	457
Losses charged off													(204)	(161)	(274)
Recoveries													12	24	85
Allowance for loan losses, End of period	8,426				7,704				7,358				8,426	7,704	7,358
Allowance for loan losses, individually evaluated for impairment, Ending balance																100	100	100
Allowance for loan losses, collectively evaluated for impairment, Ending balance																8,326	7,604	7,258
Total allowance for loan losses	8,426			7,704	7,704			7,358	7,358			7,090	7,704	7,358	7,090	8,426	7,704	7,358
Loans, individually evaluated for impairment, Ending balance																7,178	2,064	1,888
Loans, collectively evaluated for impairment, Ending balance																681,299	475,863	454,245
Total loans receivable																688,477	477,927	456,133
Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, Beginning of period				1,761				2,303				2,683	1,761	2,303	2,683
Provision charged (credited) to expense													(57)	(271)	15
Losses charged off													(174)	(284)	(420)
Recoveries													18	13	25
Allowance for loan losses, End of period	1,548				1,761				2,303				1,548	1,761	2,303
Allowance for loan losses, collectively evaluated for impairment, Ending balance																1,548	1,761	2,303
Total allowance for loan losses	1,548			1,761	1,761			2,303	2,303			2,683	1,761	2,303	2,683	1,548	1,761	2,303
Loans, individually evaluated for impairment, Ending balance																1,137	1,543	1,869
Loans, collectively evaluated for impairment, Ending balance																463,402	442,700	476,979
Total loans receivable																464,539	444,243	478,848
Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses, Beginning of period				2,922				2,721				2,868	2,922	2,721	2,868
Provision charged (credited) to expense													1,263	1,008	378
Losses charged off													(1,088)	(967)	(788)
Recoveries													210	160	263
Allowance for loan losses, End of period	3,307				2,922				2,721				3,307	2,922	2,721
Allowance for loan losses, collectively evaluated for impairment, Ending balance																3,307	2,922	2,721
Total allowance for loan losses	$ 3,307			$ 2,922	$ 2,922			$ 2,721	$ 2,721			$ 2,868	$ 2,922	$ 2,721	$ 2,868	3,307	2,922	2,721
Loans, collectively evaluated for impairment, Ending balance																344,240	264,543	237,655
Total loans receivable																$ 344,240	$ 264,543	$ 237,655