Allowance For Loan Losses - Allowance For Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	$ 19,697	$ 18,153	$ 16,723
Charge-Offs	(1,744)	(1,482)	(826)
Recoveries	308	728	502
Provision (benefit)	3,200	2,298	1,754
Balance, end of period	21,461	19,697	18,153
Individually evaluated for impairment	966	614	344
Collectively evaluated for impairment	20,495	19,083	17,809
Commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	5,535	5,906	5,643
Charge-Offs	(1,611)	(903)	(616)
Recoveries	293	699	379
Provision (benefit)	1,955	(167)	500
Balance, end of period	6,172	5,535	5,906
Individually evaluated for impairment	966	614	344
Collectively evaluated for impairment	5,206	4,921	5,562
Real estate construction one-to-four family
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	550	854	644
Charge-Offs	0	(535)	0
Recoveries	0	0	0
Provision (benefit)	79	231	210
Balance, end of period	629	550	854
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	629	550	854
Real estate construction other
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	1,465	1,439	1,653
Charge-Offs	0	0	0
Recoveries	0	0	0
Provision (benefit)	101	26	(214)
Balance, end of period	1,566	1,465	1,439
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	1,566	1,465	1,439
Real estate term owner occupied
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	2,358	1,657	1,580
Charge-Offs	0	0	0
Recoveries	0	0	0
Provision (benefit)	(164)	701	77
Balance, end of period	2,194	2,358	1,657
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	2,194	2,358	1,657
Real estate term non-owner occupied
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	6,853	5,515	4,704
Charge-Offs	0	0	0
Recoveries	0	0	0
Provision (benefit)	(810)	1,338	811
Balance, end of period	6,043	6,853	5,515
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	6,043	6,853	5,515
Real estate term other
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	819	628	656
Charge-Offs	(5)	0	(81)
Recoveries	2	0	107
Provision (benefit)	(91)	191	(54)
Balance, end of period	725	819	628
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	725	819	628
Consumer secured by 1st deeds of trust
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	313	264	285
Charge-Offs	(85)	(36)	(28)
Recoveries	2	0	3
Provision (benefit)	85	85	4
Balance, end of period	315	313	264
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	315	313	264
Consumer other
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	408	397	410
Charge-Offs	(43)	(8)	(101)
Recoveries	11	29	13
Provision (benefit)	(69)	(10)	75
Balance, end of period	307	408	397
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	307	408	397
Unallocated
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of period	1,396	1,493	1,148
Charge-Offs	0	0	0
Recoveries	0	0	0
Provision (benefit)	2,114	(97)	345
Balance, end of period	3,510	1,396	1,493
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	$ 3,510	$ 1,396	$ 1,493