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	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	$ 1,106		$ 973
Collectively evaluated for impairment	22,184		23,487
Ending balance	23,290	$ 23,734	24,460	$ 27,194	$ 29,030	$ 29,030
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	24		89
Collectively evaluated for impairment	6,100		5,199
Ending balance	6,124	6,051	5,288	6,130	5,422	6,600
Construction
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment			5
Collectively evaluated for impairment	4,401		5,025
Ending balance	4,401	4,266	5,030	4,370	4,251	3,721
Residential Real Estate | 1-to-4 Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	30		66
Collectively evaluated for impairment	3,469		4,060
Ending balance	3,499	3,555	4,126	4,967	5,206	6,364
Residential Real Estate | Residential Line of Credit
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	140
Collectively evaluated for impairment	1,690		2,178
Ending balance	1,830	1,922	2,178	3,674	3,592	2,790
Residential Real Estate | Multi-Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Collectively evaluated for impairment	613		311
Ending balance	613	448	311	300	312	184
Commercial Real Estate | Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	162		38
Collectively evaluated for impairment	3,479		3,996
Ending balance	3,641	3,672	4,034	3,984	7,112	6,075
Commercial Real Estate | Non-Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	748		775
Collectively evaluated for impairment	1,667		1,835
Ending balance	2,415	2,752	2,610	2,819	2,294	2,641
Consumer and Other
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	2
Collectively evaluated for impairment	765		883
Ending balance	$ 767	$ 1,068	$ 883	$ 950	$ 841	$ 655