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	Mar. 31, 2017	Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	$ 9,419	$ 12,951
Collectively evaluated for impairment	1,875,477	1,819,775
Acquired with deteriorated credit quality	16,099	16,058
Gross loans	1,900,995	1,848,784
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	1,272	1,476
Collectively evaluated for impairment	397,583	384,279
Acquired with deteriorated credit quality	478	478
Gross loans	399,333	386,233
Construction
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	305	2,686
Collectively evaluated for impairment	263,424	238,900
Acquired with deteriorated credit quality	4,269	4,319
Gross loans	267,998	245,905
Residential Real Estate | 1-to-4 Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	2,216	2,471
Collectively evaluated for impairment	297,817	290,346
Acquired with deteriorated credit quality	2,133	2,107
Gross loans	302,166	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	177,928	176,879
Gross loans	177,928	177,190
Residential Real Estate | Multi-Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	1,014	1,027
Collectively evaluated for impairment	44,205	43,922
Acquired with deteriorated credit quality	25	28
Gross loans	45,244	44,977
Commercial Real Estate | Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	2,459	2,752
Collectively evaluated for impairment	352,623	350,812
Acquired with deteriorated credit quality	4,038	3,782
Gross loans	359,120	357,346
Commercial Real Estate | Non-Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	2,128	2,201
Collectively evaluated for impairment	266,436	260,361
Acquired with deteriorated credit quality	5,152	5,340
Gross loans	273,716	267,902
Consumer and Other
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	25	27
Collectively evaluated for impairment	75,461	74,276
Acquired with deteriorated credit quality	4	4
Gross loans	$ 75,490	$ 74,307