v3.7.0.1
Allowance for Loan Losses - Risk Category of Loans by Class of Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]    
Total loans $ 2,861,456 $ 2,552,016
Residential Properties    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 2,083,901 1,780,889
Commercial Real Estate    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 480,129 476,959
Land and Construction    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 25,057 24,100
Commercial and Industrial Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 243,305 237,941
Consumer Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 29,064 32,127
Pass    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 2,832,934 2,519,683
Pass | Residential Properties    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 2,076,409 1,773,296
Pass | Commercial Real Estate    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 473,724 470,484
Pass | Land and Construction    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 25,057 24,100
Pass | Commercial and Industrial Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 228,680 219,676
Pass | Consumer Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 29,064 32,127
Special Mention    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 9,387 7,038
Special Mention | Residential Properties    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 1,500 1,500
Special Mention | Commercial Real Estate    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 1,903 1,913
Special Mention | Commercial and Industrial Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 5,984 3,625
Substandard    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 8,075 16,301
Substandard | Commercial Real Estate    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 2,393 2,414
Substandard | Commercial and Industrial Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 5,682 13,887
Impaired    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 11,060 8,994
Impaired | Residential Properties    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 5,992 6,093
Impaired | Commercial Real Estate    
Accounts Notes And Loans Receivable [Line Items]    
Total loans 2,109 2,148
Impaired | Commercial and Industrial Loans    
Accounts Notes And Loans Receivable [Line Items]    
Total loans $ 2,959 $ 753