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Securities - Summary of Investments in an Unrealized Loss Position that were Temporarily Impaired (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Less than 12 months - Fair Value $ 66,073 $ 52,580
Securities available for sale, 12 months or more - Fair Value 5,499 14,462
Securities available for sale, Total - Fair Value 71,572 67,042
Securities available for sale, Less than 12 months - Unrealized (Loss) (1,429) (479)
Securities available for sale, 12 months or more - Unrealized (Loss) (208) (414)
Total Unrealized (Loss) (1,637) (893)
Securities held to maturity, Less than 12 months - Fair Value 48,980 35,843
Securities held to maturity, 12 months or more - Fair Value 0 0
Securities held to maturity, Total - Fair Value 48,980 35,843
Securities held to maturity, Less than 12 months - Unrealized (Loss) (708) (345)
Securities held to maturity, 12 months or more - Unrealized (Loss) 0 0
Total Unrealized (Loss) (708) (345)
Total securities, Less than 12 months - Fair Value 115,053 88,423
Total securities, 12 months or more - Fair Value 5,499 14,462
Total securities, Total - Fair Value 120,552 102,885
Total securities, Less than 12 months - Unrealized (Loss) (2,137) (824)
Total securities, 12 months or more - Unrealized (Loss) (208) (414)
Total Unrealized (Loss) (2,345) (1,238)
U.S. Agency and Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Less than 12 months - Fair Value 60,943 50,185
Securities available for sale, 12 months or more - Fair Value 5,499 13,409
Securities available for sale, Total - Fair Value 66,442 63,594
Securities available for sale, Less than 12 months - Unrealized (Loss) (1,249) (464)
Securities available for sale, 12 months or more - Unrealized (Loss) (208) (379)
Total Unrealized (Loss) (1,457) (843)
Securities held to maturity, Less than 12 months - Fair Value 34,770 32,791
Securities held to maturity, 12 months or more - Fair Value 0 0
Securities held to maturity, Total - Fair Value 34,770 32,791
Securities held to maturity, Less than 12 months - Unrealized (Loss) (483) (326)
Securities held to maturity, 12 months or more - Unrealized (Loss) 0 0
Total Unrealized (Loss) (483) (326)
Obligations of States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, Less than 12 months - Fair Value 5,130 2,395
Securities available for sale, 12 months or more - Fair Value   1,053
Securities available for sale, Total - Fair Value 5,130 3,448
Securities available for sale, Less than 12 months - Unrealized (Loss) (180) (15)
Securities available for sale, 12 months or more - Unrealized (Loss)   (35)
Total Unrealized (Loss) (180) (50)
Securities held to maturity, Less than 12 months - Fair Value 12,724 3,052
Securities held to maturity, 12 months or more - Fair Value 0 0
Securities held to maturity, Total - Fair Value 12,724 3,052
Securities held to maturity, Less than 12 months - Unrealized (Loss) (211) (19)
Securities held to maturity, 12 months or more - Unrealized (Loss) 0 0
Total Unrealized (Loss) (211) $ (19)
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities held to maturity, Less than 12 months - Fair Value 1,486  
Securities held to maturity, 12 months or more - Fair Value 0  
Securities held to maturity, Total - Fair Value 1,486  
Securities held to maturity, Less than 12 months - Unrealized (Loss) (14)  
Securities held to maturity, 12 months or more - Unrealized (Loss) 0  
Total Unrealized (Loss) $ (14)