Loans and Allowance for Loan Losses - Allocation of Allowance for Loan Losses by Loan Category Broken Out Between Loans Individually Evaluated for Impairment and Collectively Evaluated for Impairment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	$ 513	$ 973	$ 2,825
Collectively evaluated for impairment	21,234	23,487	26,205
Ending balance	21,747	24,460	29,030	$ 32,353
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	135	89	892
Collectively evaluated for impairment	5,174	5,046	5,708
Ending balance	5,309	5,135	6,600	6,756
Construction
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment		5	122
Collectively evaluated for impairment	4,940	5,138	3,599
Ending balance	4,940	5,143	3,721	5,033
Residential Real Estate | 1-to-4 Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	23	66	458
Collectively evaluated for impairment	3,174	4,110	5,906
Ending balance	3,197	4,176	6,364	7,211
Residential Real Estate | Residential Line of Credit
Accounts Notes And Loans Receivable [Line Items]
Collectively evaluated for impairment	1,613	2,201	2,790
Ending balance	1,613	2,201	2,790	2,775
Residential Real Estate | Multi-Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment			80
Collectively evaluated for impairment	504	311	104
Ending balance	504	311	184	342
Commercial Real Estate | Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	113	74	373
Collectively evaluated for impairment	3,189	3,608	5,702
Ending balance	3,302	3,682	6,075	5,659
Commercial Real Estate | Non-Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	242	739	900
Collectively evaluated for impairment	1,777	1,883	1,741
Ending balance	2,019	2,622	2,641	3,438
Consumer and Other
Accounts Notes And Loans Receivable [Line Items]
Collectively evaluated for impairment	863	1,190	655
Ending balance	$ 863	$ 1,190	$ 655	$ 1,139