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Financial Instruments with Off-Balance Sheet Risk - Narrative (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Commitments outstanding $ 61,000,000 $ 25,100,000    
Line of credit 499,000,000 330,000,000    
Standby letters of credit 15,900,000 9,600,000    
Credit loss reserve 800,000 750,000    
Mortgage loan reserve 987,000 $ 1,029,000 $ 1,029,000 $ 1,029,000
Letter of Credit Agreement with Commonwealth of Virginia Treasury Board        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Maximum borrowing capacity letter of credit $ 65,000,000