Allowance for Loan Losses - Risk Category of Loans by Class of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 2,552,016	$ 1,765,469
Residential Properties
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,780,889	1,160,568
Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans	476,959	358,791
Commercial and Industrial Loans
Accounts Notes And Loans Receivable [Line Items]
Total loans	237,941	196,584
Consumer Loans
Accounts Notes And Loans Receivable [Line Items]
Total loans	32,127	37,206
Land
Accounts Notes And Loans Receivable [Line Items]
Total loans	24,100	12,320
Pass
Accounts Notes And Loans Receivable [Line Items]
Total loans	2,519,683	1,740,082
Pass | Residential Properties
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,773,296	1,159,029
Pass | Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans	470,484	351,988
Pass | Commercial and Industrial Loans
Accounts Notes And Loans Receivable [Line Items]
Total loans	219,676	180,755
Pass | Consumer Loans
Accounts Notes And Loans Receivable [Line Items]
Total loans	32,127	37,130
Pass | Land
Accounts Notes And Loans Receivable [Line Items]
Total loans	24,100	11,180
Special Mention
Accounts Notes And Loans Receivable [Line Items]
Total loans	7,038	6,690
Special Mention | Residential Properties
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,500	1,539
Special Mention | Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,913	174
Special Mention | Commercial and Industrial Loans
Accounts Notes And Loans Receivable [Line Items]
Total loans	3,625	4,977
Substandard
Accounts Notes And Loans Receivable [Line Items]
Total loans	16,301	6,659
Substandard | Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans	2,414	354
Substandard | Commercial and Industrial Loans
Accounts Notes And Loans Receivable [Line Items]
Total loans	13,887	5,165
Substandard | Land
Accounts Notes And Loans Receivable [Line Items]
Total loans		1,140
Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans	8,994	12,038
Impaired | Residential Properties
Accounts Notes And Loans Receivable [Line Items]
Total loans	6,093
Impaired | Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans	2,148	6,275
Impaired | Commercial and Industrial Loans
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 753	5,687
Impaired | Consumer Loans
Accounts Notes And Loans Receivable [Line Items]
Total loans		$ 76