Loans and Credit Quality - Loan Portfolio Segmented By Risk Class (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	$ 988,833	$ 959,109
Less: Unearned origination fees, net of origination costs	(4,487)	(4,156)
Total loans	984,346	954,953
Asset Quality Rating - Pass
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	928,552	905,022
Asset Quality Rating - Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	31,426	18,726
Asset Quality Rating - Substandard
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	28,854	35,361
Commercial
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	342,420	313,514
Total loans	341,091	312,254
Commercial | Asset Quality Rating - Pass
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	315,112	277,371
Commercial | Asset Quality Rating - Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	5,116	4,921
Commercial | Asset Quality Rating - Substandard
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	22,192	31,222
Real estate construction one-to-four family
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	37,111	31,201
Total loans	36,828	30,955
Real estate construction one-to-four family | Asset Quality Rating - Pass
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	33,729	31,201
Real estate construction one-to-four family | Asset Quality Rating - Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	3,382	0
Real estate construction one-to-four family | Asset Quality Rating - Substandard
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	0	0
Real estate construction other
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	72,256	80,093
Total loans	71,658	79,784
Real estate construction other | Asset Quality Rating - Pass
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	72,256	80,093
Real estate construction other | Asset Quality Rating - Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	0	0
Real estate construction other | Asset Quality Rating - Substandard
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	0	0
Real estate term owner occupied
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	126,414	132,042
Total loans	125,795	131,389
Real estate term owner occupied | Asset Quality Rating - Pass
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	117,174	127,059
Real estate term owner occupied | Asset Quality Rating - Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	3,987	2,095
Real estate term owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	5,253	2,888
Real estate term non-owner occupied
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	325,720	319,313
Total loans	324,198	317,808
Real estate term non-owner occupied | Asset Quality Rating - Pass
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	307,126	307,780
Real estate term non-owner occupied | Asset Quality Rating - Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	18,129	11,051
Real estate term non-owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	465	482
Real estate term other
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	42,039	40,411
Total loans	41,746	40,101
Real estate term other | Asset Quality Rating - Pass
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	40,792	39,777
Real estate term other | Asset Quality Rating - Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	670	634
Real estate term other | Asset Quality Rating - Substandard
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	577	0
Consumer secured by 1st deeds of trust
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	19,228	22,616
Total loans	19,234	22,625
Consumer secured by 1st deeds of trust | Asset Quality Rating - Pass
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	18,768	21,846
Consumer secured by 1st deeds of trust | Asset Quality Rating - Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	140	3
Consumer secured by 1st deeds of trust | Asset Quality Rating - Substandard
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	320	767
Consumer other
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	23,645	19,919
Total loans	23,796	20,037
Consumer other | Asset Quality Rating - Pass
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	23,595	19,895
Consumer other | Asset Quality Rating - Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	2	22
Consumer other | Asset Quality Rating - Substandard
Financing Receivable, Recorded Investment [Line Items]
Total financing receivables	$ 47	$ 2