Allowance For Loan Losses And Credit Quality Of Financing Receivables - Credit Risk Profile By Creditworthiness (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	$ 664,190	$ 544,090
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	34,152	20,023
Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	21,912	13,348
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	465,600	382,262
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	141,466	127,204
Consumer And Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	1,060	1,253
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	647,417	526,666
Pass [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	34,023	19,983
Pass [Member] | Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	21,912	13,348
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	451,289	367,305
Pass [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	139,133	124,915
Pass [Member] | Consumer And Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	1,060	1,115
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	9,375	9,705
Special Mention [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	95	5
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	8,717	8,957
Special Mention [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	563	743
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	7,398	7,719
Substandard [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	34	35
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	5,594	6,000
Substandard [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	1,770	1,546
Substandard [Member] | Consumer And Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	$ 0	$ 138