Allowance for Loan Losses - Allowance For Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	$ 16,947	$ 16,032	$ 16,723	$ 16,282
Charge-Offs	0	(63)	(188)	(392)
Recoveries	95	1,199	181	1,278
Provision (benefit)	376	(1,136)	702	(1,136)
Balance, end of period	17,418	16,032	17,418	16,032
Balance, end of period: Individually evaluated for impairment	265	14	265	14
Balance, end of period: Collectively evaluated for impairment	17,153	16,018	17,153	16,018
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	6,091	5,657	5,643	5,779
Charge-Offs	0	0	(107)	(320)
Recoveries	91	576	158	630
Provision (benefit)	(495)	(1,099)	(7)	(955)
Balance, end of period	5,687	5,134	5,687	5,134
Balance, end of period: Individually evaluated for impairment	265	0	265	0
Balance, end of period: Collectively evaluated for impairment	5,422	5,134	5,422	5,134
Real Estate Construction One-To- Four Family
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	757	513	644	557
Charge-Offs	0	0	0	0
Recoveries	0	613	0	625
Provision (benefit)	(68)	(556)	45	(612)
Balance, end of period	689	570	689	570
Balance, end of period: Individually evaluated for impairment	0	0	0	0
Balance, end of period: Collectively evaluated for impairment	689	570	689	570
Real Estate Construction Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	1,663	623	1,653	539
Charge-Offs	0	0	0	0
Recoveries	0	0	0	0
Provision (benefit)	200	207	210	291
Balance, end of period	1,863	830	1,863	830
Balance, end of period: Individually evaluated for impairment	0	0	0	0
Balance, end of period: Collectively evaluated for impairment	1,863	830	1,863	830
Real Estate Term Owner Occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	1,570	1,407	1,580	1,583
Charge-Offs	0	0	0	0
Recoveries	0	0	0	0
Provision (benefit)	(100)	(23)	(110)	(199)
Balance, end of period	1,470	1,384	1,470	1,384
Balance, end of period: Individually evaluated for impairment	0	0	0	0
Balance, end of period: Collectively evaluated for impairment	1,470	1,384	1,470	1,384
Real Estate Term Non-Owner Occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	4,794	4,293	4,704	4,297
Charge-Offs	0	0	0	0
Recoveries	0	0	0	0
Provision (benefit)	94	(169)	184	(173)
Balance, end of period	4,888	4,124	4,888	4,124
Balance, end of period: Individually evaluated for impairment	0	0	0	0
Balance, end of period: Collectively evaluated for impairment	4,888	4,124	4,888	4,124
Real Estate Term Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	756	655	656	537
Charge-Offs	0	0	(81)	0
Recoveries	0	0	17	0
Provision (benefit)	(85)	(13)	79	105
Balance, end of period	671	642	671	642
Balance, end of period: Individually evaluated for impairment	0	0	0	0
Balance, end of period: Collectively evaluated for impairment	671	642	671	642
Consumer Secured By 1st Deed Of Trust
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	274	313	285	322
Charge-Offs	0	(39)	0	(39)
Recoveries	0	0	0	0
Provision (benefit)	(9)	(2)	(20)	(11)
Balance, end of period	265	272	265	272
Balance, end of period: Individually evaluated for impairment	0	14	0	14
Balance, end of period: Collectively evaluated for impairment	265	258	265	258
Consumer Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	402	384	410	390
Charge-Offs	0	(24)	0	(33)
Recoveries	4	10	6	23
Provision (benefit)	9	0	(1)	(10)
Balance, end of period	415	370	415	370
Balance, end of period: Individually evaluated for impairment	0	0	0	0
Balance, end of period: Collectively evaluated for impairment	415	370	415	370
Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	640	2,187	1,148	2,278
Charge-Offs	0	0	0	0
Recoveries	0	0	0	0
Provision (benefit)	830	519	322	428
Balance, end of period	1,470	2,706	1,470	2,706
Balance, end of period: Individually evaluated for impairment	0	0	0	0
Balance, end of period: Collectively evaluated for impairment	$ 1,470	$ 2,706	$ 1,470	$ 2,706