v3.8.0.1
Allowance for Loan Losses - Risk Category of Loans by Class of Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]    
Total loans $ 3,249,860 $ 2,552,016
Residential Properties    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 2,400,539 1,780,889
Commercial Real Estate    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 529,590 476,959
Land and Construction    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 31,304 24,100
Commercial and Industrial Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 259,958 237,941
Consumer Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 28,469 32,127
Pass    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 3,224,449 2,519,683
Pass | Residential Properties    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 2,398,246 1,773,296
Pass | Commercial Real Estate    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 519,931 470,484
Pass | Land and Construction    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 31,304 24,100
Pass | Commercial and Industrial Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 246,499 219,676
Pass | Consumer Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 28,469 32,127
Special Mention    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 5,946 7,038
Special Mention | Residential Properties    
Accounts Notes And Loans Receivable [Line Items]    
Total loans   1,500
Special Mention | Commercial Real Estate    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 5,131 1,913
Special Mention | Commercial and Industrial Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 815 3,625
Substandard    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 5,115 16,301
Substandard | Residential Properties    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 2,293  
Substandard | Commercial Real Estate    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 925 2,414
Substandard | Commercial and Industrial Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 1,897 13,887
Impaired    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 14,350 8,994
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 3,603 2,148
Impaired | Commercial and Industrial Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total loans $ 10,747 $ 753