Loans and Allowance for Loan Losses - Amount of Loans by Loan Category Broken Out Between Loans Individually Evaluated for Impairment and Collectively Evaluated for Impairment (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	$ 9,214	$ 12,951
Collectively evaluated for impairment	1,946,027	1,819,775
Acquired with deteriorated credit quality	15,733	16,058
Gross loans	1,970,974	1,848,784
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	1,222	1,476
Collectively evaluated for impairment	422,242	384,279
Acquired with deteriorated credit quality	240	478
Gross loans	423,704	386,233
Construction
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	299	2,686
Collectively evaluated for impairment	278,077	238,900
Acquired with deteriorated credit quality	4,351	4,319
Gross loans	282,727	245,905
Residential Real Estate | 1-to-4 Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	2,191	2,471
Collectively evaluated for impairment	302,961	290,346
Acquired with deteriorated credit quality	2,000	2,107
Gross loans	307,152	294,924
Residential Real Estate | Residential Line of Credit
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment		311
Collectively evaluated for impairment	177,783	176,879
Gross loans	177,783	177,190
Residential Real Estate | Multi-Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	1,001	1,027
Collectively evaluated for impairment	51,785	43,922
Acquired with deteriorated credit quality	24	28
Gross loans	52,810	44,977
Commercial Real Estate | Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	2,374	2,752
Collectively evaluated for impairment	365,087	350,812
Acquired with deteriorated credit quality	4,001	3,782
Gross loans	371,462	357,346
Commercial Real Estate | Non-Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	2,103	2,201
Collectively evaluated for impairment	266,068	260,361
Acquired with deteriorated credit quality	5,114	5,340
Gross loans	273,285	267,902
Consumer and Other
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	24	27
Collectively evaluated for impairment	82,024	74,276
Acquired with deteriorated credit quality	3	4
Gross loans	$ 82,051	$ 74,307