Allowance For Loan Losses - Balance Of The Allowance Segregated By Segment And Class (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 966	$ 614	$ 344
Collectively evaluated for impairment	20,495	19,083	17,809
Total	21,461	19,697	18,153	$ 16,723
Asset Quality Rating - Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	966	614
Collectively evaluated for impairment	8	3
Asset Quality Rating - Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	16,453	17,628
Asset Quality Rating - Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	524	56
Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	3,510	1,396
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	966	614	344
Collectively evaluated for impairment	5,206	4,921	5,562
Total	6,172	5,535	5,906	5,643
Commercial | Asset Quality Rating - Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	966	614
Collectively evaluated for impairment	7	3
Commercial | Asset Quality Rating - Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	5,079	4,867
Commercial | Asset Quality Rating - Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	120	51
Commercial | Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Real estate construction one-to-four family
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	629	550	854
Total	629	550	854	644
Real estate construction one-to-four family | Asset Quality Rating - Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Real estate construction one-to-four family | Asset Quality Rating - Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	629	550
Real estate construction one-to-four family | Asset Quality Rating - Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Real estate construction one-to-four family | Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Real estate construction other
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	1,566	1,465	1,439
Total	1,566	1,465	1,439	1,653
Real estate construction other | Asset Quality Rating - Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Real estate construction other | Asset Quality Rating - Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	1,566	1,465
Real estate construction other | Asset Quality Rating - Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Real estate construction other | Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Real estate term owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	2,194	2,358	1,657
Total	2,194	2,358	1,657	1,580
Real estate term owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Real estate term owner occupied | Asset Quality Rating - Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	2,154	2,358
Real estate term owner occupied | Asset Quality Rating - Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	40	0
Real estate term owner occupied | Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Real estate term non-owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	6,043	6,853	5,515
Total	6,043	6,853	5,515	4,704
Real estate term non-owner occupied | Asset Quality Rating - Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Real estate term non-owner occupied | Asset Quality Rating - Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	5,680	6,853
Real estate term non-owner occupied | Asset Quality Rating - Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	363	0
Real estate term non-owner occupied | Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Real estate term other
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	725	819	628
Total	725	819	628	656
Real estate term other | Asset Quality Rating - Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Real estate term other | Asset Quality Rating - Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	725	819
Real estate term other | Asset Quality Rating - Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Real estate term other | Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Consumer secured by 1st deeds of trust
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	315	313	264
Total	315	313	264	285
Consumer secured by 1st deeds of trust | Asset Quality Rating - Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Consumer secured by 1st deeds of trust | Asset Quality Rating - Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	315	310
Consumer secured by 1st deeds of trust | Asset Quality Rating - Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	3
Consumer secured by 1st deeds of trust | Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Consumer other
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	307	408	397
Total	307	408	397	410
Consumer other | Asset Quality Rating - Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	1	0
Consumer other | Asset Quality Rating - Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	305	406
Consumer other | Asset Quality Rating - Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	1	2
Consumer other | Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	3,510	1,396	1,493
Total	3,510	1,396	$ 1,493	$ 1,148
Unallocated | Asset Quality Rating - Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Unallocated | Asset Quality Rating - Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Unallocated | Asset Quality Rating - Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Unallocated | Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	$ 3,510	$ 1,396