Loans (Loan Receivable and Allowance Balances Disaggregated) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Loan receivables:
Ending balance: individually evaluated for impairment	$ 28,036		$ 36,880	$ 35,548
Ending balance: collectively evaluated for impairment	1,384,578		1,306,822	1,268,678
Total Loan Receivables	1,415,417		1,346,922	1,307,737
Allowance for loan losses:
Ending balance: individually evaluated for impairment	1,476		1,180	1,010
Ending balance: collectively evaluated for impairment	9,776		9,796	9,729
Total Allowance for loan losses	11,252	$ 10,918	10,976	10,739	$ 10,725	$ 10,515
PCI Loans [Member]
Loan receivables:
Total Loan Receivables	2,803		3,220	3,511
All Other Loans [Member]
Loan receivables:
Total Loan Receivables	1,412,614		1,343,702
Commercial Real Estate Portfolio Segment [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	20,974		27,540	26,225
Ending balance: collectively evaluated for impairment	909,638		848,691	820,257
Total Loan Receivables	932,344		878,016	847,945
Allowance for loan losses:
Ending balance: individually evaluated for impairment	444		326	174
Ending balance: collectively evaluated for impairment	6,659		6,556	6,538
Total Allowance for loan losses	7,103	7,009	6,882	6,712	6,563	6,451
Commercial Real Estate Portfolio Segment [Member] | PCI Loans [Member]
Loan receivables:
Total Loan Receivables	1,732		1,785	1,463
Commercial Real Estate Portfolio Segment [Member] | All Other Loans [Member]
Loan receivables:
Total Loan Receivables	930,612		876,231
Residential First Mortgages Portfolio Segment [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	2,089		2,527	2,616
Ending balance: collectively evaluated for impairment	161,187		153,716	153,481
Total Loan Receivables	163,727		156,709	156,565
Allowance for loan losses:
Ending balance: individually evaluated for impairment				0
Ending balance: collectively evaluated for impairment	629		755	691
Total Allowance for loan losses	629	709	755	691	737	1,144
Residential First Mortgages Portfolio Segment [Member] | PCI Loans [Member]
Loan receivables:
Total Loan Receivables	451		466	468
Residential First Mortgages Portfolio Segment [Member] | All Other Loans [Member]
Loan receivables:
Total Loan Receivables	163,276		156,243
Residential Rentals Portfolio Segment [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	956		1,745	1,377
Ending balance: collectively evaluated for impairment	119,897		121,656	122,745
Total Loan Receivables	121,170		124,298	125,383
Allowance for loan losses:
Ending balance: collectively evaluated for impairment	407		498	585
Total Allowance for loan losses	407	458	498	585	469	512
Residential Rentals Portfolio Segment [Member] | PCI Loans [Member]
Loan receivables:
Total Loan Receivables	317		897	1,261
Residential Rentals Portfolio Segment [Member] | All Other Loans [Member]
Loan receivables:
Total Loan Receivables	120,853		123,401
Construction And Land Development Portfolio Segment [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	0		729	729
Ending balance: collectively evaluated for impairment	30,774		28,976	28,059
Total Loan Receivables	30,774		29,705	28,788
Allowance for loan losses:
Ending balance: individually evaluated for impairment				0
Ending balance: collectively evaluated for impairment	194		310	295
Total Allowance for loan losses	194	246	310	295	498	462
Construction And Land Development Portfolio Segment [Member] | PCI Loans [Member]
Loan receivables:
Total Loan Receivables				0
Construction And Land Development Portfolio Segment [Member] | All Other Loans [Member]
Loan receivables:
Total Loan Receivables	30,774		29,705
Home Equity And Second Mortgage Loans [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	577		288	293
Ending balance: collectively evaluated for impairment	35,302		35,201	35,748
Total Loan Receivables	36,182		35,561	36,360
Allowance for loan losses:
Ending balance: individually evaluated for impairment				0
Ending balance: collectively evaluated for impairment	125		133	177
Total Allowance for loan losses	125	131	133	177	104	162
Home Equity And Second Mortgage Loans [Member] | PCI Loans [Member]
Loan receivables:
Total Loan Receivables	303		72	319
Commercial Portfolio Segment [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	2,629		2,751	2,773
Ending balance: collectively evaluated for impairment	66,550		68,929	59,310
Total Loan Receivables	69,179		71,680	62,083
Allowance for loan losses:
Ending balance: individually evaluated for impairment	822		700	458
Ending balance: collectively evaluated for impairment	779		782	756
Total Allowance for loan losses	1,601	1,402	1,482	1,214	1,203	1,013
Commercial Portfolio Segment [Member] | All Other Loans [Member]
Loan receivables:
Total Loan Receivables	69,179		71,680
Consumer Portfolio Segment [Member]
Loan receivables:
Ending balance: individually evaluated for impairment			1	1
Ending balance: collectively evaluated for impairment	937		750	729
Total Loan Receivables	937		751	730
Allowance for loan losses:
Ending balance: individually evaluated for impairment			1	1
Ending balance: collectively evaluated for impairment	8		5	4
Total Allowance for loan losses	8	9	6	5	7	7
Consumer Portfolio Segment [Member] | All Other Loans [Member]
Loan receivables:
Total Loan Receivables	937		751
Commercial Equipment Portfolio Segment [Member]
Loan receivables:
Ending balance: individually evaluated for impairment	811		1,299	1,534
Ending balance: collectively evaluated for impairment	60,293		48,903	48,349
Total Loan Receivables	61,104		50,202	49,883
Allowance for loan losses:
Ending balance: individually evaluated for impairment	210		153	377
Ending balance: collectively evaluated for impairment	975		757	683
Total Allowance for loan losses	1,185	$ 954	910	$ 1,060	$ 1,144	$ 764
Commercial Equipment Portfolio Segment [Member] | All Other Loans [Member]
Loan receivables:
Total Loan Receivables	$ 61,104		$ 50,202