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	Sep. 30, 2016	Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	$ 14,367	$ 15,576
Collectively evaluated for impairment	1,762,337	1,664,912
Acquired with deteriorated credit quality	16,639	21,375
Gross loans	1,793,343	1,701,863
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	1,531	1,499
Collectively evaluated for impairment	368,317	314,665
Acquired with deteriorated credit quality	531	874
Gross loans	370,379	317,038
Construction
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	2,773	2,866
Collectively evaluated for impairment	220,030	221,300
Acquired with deteriorated credit quality	4,518	6,859
Gross loans	227,321	231,025
Residential Real Estate | 1-to-4 Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	2,721	3,686
Collectively evaluated for impairment	281,609	281,235
Acquired with deteriorated credit quality	2,250	2,828
Gross loans	286,580	287,749
Residential Real Estate | Residential Line of Credit
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	316
Collectively evaluated for impairment	173,582	171,526
Gross loans	173,898	171,526
Residential Real Estate | Multi-Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	1,034	1,074
Collectively evaluated for impairment	53,065	58,400
Acquired with deteriorated credit quality	30	36
Gross loans	54,129	59,510
Commercial Real Estate | Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	2,658	2,425
Collectively evaluated for impairment	344,302	322,999
Acquired with deteriorated credit quality	3,830	4,783
Gross loans	350,790	330,207
Commercial Real Estate | Non-Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	3,331	4,026
Collectively evaluated for impairment	256,384	227,205
Acquired with deteriorated credit quality	5,475	5,991
Gross loans	265,190	237,222
Consumer and Other
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	3
Collectively evaluated for impairment	65,048	67,582
Acquired with deteriorated credit quality	5	4
Gross loans	$ 65,056	$ 67,586