Allowance for Loan Losses - Balance Of The Allowance Segregated By Segment And Class (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 372		$ 994
Collectively evaluated for impairment	20,077		18,899
Allowance for credit losses	20,449	$ 21,461	19,893	$ 19,697
AQR Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	16,600	16,453
AQR Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	576	524
AQR Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	318	966
Collectively evaluated for impairment	9	8
AQR Doubtful
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	54
Collectively evaluated for impairment	2
Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	2,890	3,510
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	370		994
Collectively evaluated for impairment	5,314		4,707
Allowance for credit losses	5,684	6,172	5,701	5,535
Commercial | AQR Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	5,140	5,079
Commercial | AQR Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	166	120
Commercial | AQR Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	316	966
Collectively evaluated for impairment	6	7
Commercial | AQR Doubtful
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	54
Collectively evaluated for impairment	2
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
Collectively evaluated for impairment	608		549
Allowance for credit losses	608	629	549	550
Real estate construction one-to-four family | AQR Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	608	629
Real estate construction one-to-four family | AQR Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Real estate construction one-to-four family | AQR 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 | AQR Doubtful
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0
Collectively evaluated for impairment	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
Collectively evaluated for impairment	1,069		1,383
Allowance for credit losses	1,069	1,566	1,383	1,465
Real estate construction other | AQR Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	1,069	1,566
Real estate construction other | AQR Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Real estate construction other | AQR 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 | AQR Doubtful
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0
Collectively evaluated for impairment	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
Collectively evaluated for impairment	2,174		2,372
Allowance for credit losses	2,174	2,194	2,372	2,358
Real estate term owner occupied | AQR Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	2,135	2,154
Real estate term owner occupied | AQR Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	39	40
Real estate term owner occupied | AQR 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 | AQR Doubtful
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0
Collectively evaluated for impairment	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
Collectively evaluated for impairment	6,379		7,207
Allowance for credit losses	6,379	6,043	7,207	6,853
Real estate term non-owner occupied | AQR Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	6,020	5,680
Real estate term non-owner occupied | AQR Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	359	363
Real estate term non-owner occupied | AQR 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 | AQR Doubtful
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0
Collectively evaluated for impairment	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
Collectively evaluated for impairment	1,025		774
Allowance for credit losses	1,025	725	774	819
Real estate term other | AQR Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	1,014	725
Real estate term other | AQR Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	11	0
Real estate term other | AQR 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 | AQR Doubtful
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0
Collectively evaluated for impairment	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	2		0
Collectively evaluated for impairment	303		311
Allowance for credit losses	305	315	311	313
Consumer secured by 1st deeds of trust | AQR Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	303	315
Consumer secured by 1st deeds of trust | AQR Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Consumer secured by 1st deeds of trust | AQR Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	2	0
Collectively evaluated for impairment	0	0
Consumer secured by 1st deeds of trust | AQR Doubtful
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0
Collectively evaluated for impairment	0
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
Collectively evaluated for impairment	315		391
Allowance for credit losses	315	307	391	408
Consumer other | AQR Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	311	305
Consumer other | AQR Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	1	1
Consumer other | AQR Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	3	1
Consumer other | AQR Doubtful
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0
Collectively evaluated for impairment	0
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
Collectively evaluated for impairment	2,890		1,205
Allowance for credit losses	2,890	3,510	$ 1,205	$ 1,396
Unallocated | AQR Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Unallocated | AQR Special Mention
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	0	0
Unallocated | AQR Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Unallocated | AQR Doubtful
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0
Collectively evaluated for impairment	0
Unallocated | Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	$ 2,890	$ 3,510