Fair Value - Summary of Asset Measured at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Investment securities available for sale $ 335,609 $ 332,736
Fair Valued on a Recurring Basis [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Investment securities available for sale 335,609 332,736
Fair Valued on a Non-Recurring Basis [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Impaired loans 4,342 5,580
Other real estate owned   460
Level 1 [Member] | Fair Valued on a Recurring Basis [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Investment securities available for sale 1,008 2,017
Level 2 [Member] | Fair Valued on a Recurring Basis [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Investment securities available for sale 334,601 330,719
Level 2 [Member] | Fair Valued on a Non-Recurring Basis [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Impaired loans $ 4,342 5,580
Other real estate owned   $ 460