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	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	$ 12,951	$ 15,576	$ 23,782
Collectively evaluated for impairment	1,819,775	1,664,912	1,392,114
Acquired with deteriorated credit quality	16,058	21,375
Gross loans	1,848,784	1,701,863	1,415,896
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	1,476	1,499	2,340
Collectively evaluated for impairment	384,279	316,418	263,478
Acquired with deteriorated credit quality	478	874
Gross loans	386,233	318,791	265,818
Construction
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	2,686	2,866	6,840
Collectively evaluated for impairment	238,900	228,445	159,117
Acquired with deteriorated credit quality	4,319	6,859
Gross loans	245,905	238,170	165,957
Residential Real Estate | 1-to-4 Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	2,471	3,686	6,633
Collectively evaluated for impairment	290,346	284,190	260,008
Acquired with deteriorated credit quality	2,107	2,828
Gross loans	294,924	290,704	266,641
Residential Real Estate | Residential Line of Credit
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	311
Collectively evaluated for impairment	176,879	171,526	159,868
Gross loans	177,190	171,526	159,868
Residential Real Estate | Multi-Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	1,027	1,074	1,165
Collectively evaluated for impairment	43,922	58,400	51,073
Acquired with deteriorated credit quality	28	36
Gross loans	44,977	59,510	52,238
Commercial Real Estate | Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	2,752	3,000	3,473
Collectively evaluated for impairment	350,812	329,569	287,688
Acquired with deteriorated credit quality	3,782	5,095
Gross loans	357,346	337,664	291,161
Commercial Real Estate | Non-Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	2,201	3,451	3,314
Collectively evaluated for impairment	260,361	198,741	148,666
Acquired with deteriorated credit quality	5,340	5,679
Gross loans	267,902	207,871	151,980
Consumer and Other
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	27		17
Collectively evaluated for impairment	74,276	77,623	62,216
Acquired with deteriorated credit quality	4	4
Gross loans	$ 74,307	$ 77,627	$ 62,233