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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value $ 5,823 $ 14,638
12 Months or less, Unrealized Loss (45) (161)
More than 12 months, Fair Value 17,319 82,692
More than 12 months, Unrealized Loss (89) (1,774)
Total Fair Value 23,142 97,330
Total Unrealized Loss (134) (1,935)
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
More than 12 months, Fair Value 3,430 16,469
More than 12 months, Unrealized Loss (13) (140)
Total Fair Value 3,430 16,469
Total Unrealized Loss (13) (140)
Obligations of States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 957 8,008
12 Months or less, Unrealized Loss (12) (71)
More than 12 months, Fair Value 1,005 25,890
More than 12 months, Unrealized Loss (1) (531)
Total Fair Value 1,962 33,898
Total Unrealized Loss (13) (602)
Mortgage-backed Securities in Government Sponsored Entities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 4,866 6,630
12 Months or less, Unrealized Loss (33) (90)
More than 12 months, Fair Value 12,884 40,333
More than 12 months, Unrealized Loss (75) (1,103)
Total Fair Value 17,750 46,963
Total Unrealized Loss $ (108) $ (1,193)