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	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	$ 202		$ 513
Collectively evaluated for impairment	23,045		21,234
Ending balance	23,247	$ 22,898	21,747	$ 23,734	$ 24,431	$ 24,460
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	38		135
Collectively evaluated for impairment	5,402		5,174
Ending balance	5,440	5,402	5,309	5,924	5,242	5,135
Construction
Accounts Notes And Loans Receivable [Line Items]
Collectively evaluated for impairment	5,579		4,940
Ending balance	5,579	5,598	4,940	4,373	4,518	5,143
Residential Real Estate | 1-to-4 Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	17		23
Collectively evaluated for impairment	2,957		3,174
Ending balance	2,974	2,896	3,197	3,611	4,280	4,176
Residential Real Estate | Residential Line of Credit
Accounts Notes And Loans Receivable [Line Items]
Collectively evaluated for impairment	1,445		1,613
Ending balance	1,445	1,514	1,613	1,944	2,075	2,201
Residential Real Estate | Multi-Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Collectively evaluated for impairment	513		504
Ending balance	513	508	504	453	590	311
Commercial Real Estate | Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	85		113
Collectively evaluated for impairment	3,898		3,189
Ending balance	3,983	3,387	3,302	3,764	4,013	3,682
Commercial Real Estate | Non-Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	62		242
Collectively evaluated for impairment	2,390		1,777
Ending balance	2,452	2,660	2,019	2,634	2,739	2,622
Consumer and Other
Accounts Notes And Loans Receivable [Line Items]
Collectively evaluated for impairment	861		863
Ending balance	$ 861	$ 933	$ 863	$ 1,031	$ 974	$ 1,190