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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, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets $ 957,719 $ 779,966
Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 30,396 38,494
Fair Value Measurement Of Assets On Nonrecurring Basis Net Losses On Impaired Loans (1,778) (1,548)
Other Real Estate Owned Assets Fair Value 4,035 3,264
Fair Value Measurement Of Assets On Nonrecurring Basis Net Losses On Other Real Estate Owned (593) (1,099)
Total Assets 34,431 41,758
Fair Value Measurement Of Assets On Nonrecurring Basis Net Loss (2,371) (2,647)
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 953,353 752,507
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 15,076 23,249
Other Real Estate Owned Assets Fair Value 4,035 3,264
Total Assets 19,111 26,513
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 4,366 27,459
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 15,320 15,245
Other Real Estate Owned Assets Fair Value 0 0
Total Assets $ 15,320 $ 15,245