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Fair Values of Assets and Liabilities - Schedule of Assets Measured on Nonrecurring Basis (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets $ 779,966 $ 829,181
Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 38,494 38,669
Other Real Estate Owned Assets Fair Value 3,264 7,566
Total Assets 41,758 46,235
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 0 0
Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 0 0
Other Real Estate Owned Assets Fair Value 0 0
Total Assets 0 0
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 752,507 793,289
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 23,249 18,679
Other Real Estate Owned Assets Fair Value 3,264 7,566
Total Assets 26,513 26,245
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 27,459 35,892
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 15,245 19,990
Other Real Estate Owned Assets Fair Value 0 0
Total Assets 15,245 19,990
Total Gains (Losses) [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Measurement Of Assets On Nonrecurring Basis Net Losses On Impaired Loans (1,548) (9,032)
Fair Value Measurement Of Assets On Nonrecurring Basis Net Losses On Other Real Estate Owned (1,099) (703)
Fair Value Measurement Of Assets On Nonrecurring Basis Net Loss $ (2,647) $ (9,735)