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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value $ 94,715 $ 54,040
12 Months or less, Unrealized Loss (1,375) (336)
More than 12 months, Fair Value 37,532 36,125
More than 12 months, Unrealized Loss (1,096) (718)
Total Fair Value 132,247 90,165
Total Unrealized Loss (2,471) (1,054)
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 17,342 20,449
12 Months or less, Unrealized Loss (158) (100)
More than 12 months, Fair Value 9,438 6,617
More than 12 months, Unrealized Loss (123) (92)
Total Fair Value 26,780 27,066
Total Unrealized Loss (281) (192)
Obligations of States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 27,137 4,057
12 Months or less, Unrealized Loss (410) (41)
More than 12 months, Fair Value 7,168 7,309
More than 12 months, Unrealized Loss (251) (131)
Total Fair Value 34,305 11,366
Total Unrealized Loss (661) (172)
Mortgage-backed Securities in Government Sponsored Entities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 50,236 29,534
12 Months or less, Unrealized Loss (807) (195)
More than 12 months, Fair Value 20,926 22,199
More than 12 months, Unrealized Loss (722) (495)
Total Fair Value 71,162 51,733
Total Unrealized Loss $ (1,529) $ (690)