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Securities - Summary of Investments in an Unrealized Loss Position that were Temporarily Impaired (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Securities available for sale:    
Less than 12 months - Fair value $ 48,737 $ 66,073
Less than 12 months - Unrealized (loss) (681) (1,429)
12 months or more - Fair value 4,689 5,499
12 months or more - Unrealized (loss) (154) (208)
Fair Value 53,426 71,572
Unrealized (Loss) (835) (1,637)
Securities held to maturity:    
Less than 12 months - Fair value 24,653 48,980
Less than 12 months - Unrealized (loss) (247) (708)
12 months or more - Fair value 0 0
12 months or more - Unrealized (loss) 0 0
Fair Value 24,653 48,980
Unrealized (Loss) (247) (708)
Total securities, Less than 12 months - Fair value 73,390 115,053
Total securities, Less than 12 months - Unrealized (loss) (928) (2,137)
Total securities, 12 months or more - Fair value 4,689 5,499
Total securities, 12 months or more - Unrealized (loss) (154) (208)
Total securities, Total fair value 78,079 120,552
Total unrealized (loss) (1,082) (2,345)
U.S. agency and mortgage-backed securities    
Securities available for sale:    
Less than 12 months - Fair value 44,941 60,943
Less than 12 months - Unrealized (loss) (613) (1,249)
12 months or more - Fair value 4,689 5,499
12 months or more - Unrealized (loss) (154) (208)
Fair Value 49,630 66,442
Unrealized (Loss) (767) (1,457)
Securities held to maturity:    
Less than 12 months - Fair value 22,814 34,770
Less than 12 months - Unrealized (loss) (234) (483)
12 months or more - Fair value 0 0
12 months or more - Unrealized (loss) 0 0
Fair Value 22,814 34,770
Unrealized (Loss) (234) (483)
Obligations of states and political subdivisions    
Securities available for sale:    
Less than 12 months - Fair value 3,796 5,130
Less than 12 months - Unrealized (loss) (68) (180)
12 months or more - Fair value 0 0
12 months or more - Unrealized (loss) 0 0
Fair Value 3,796 5,130
Unrealized (Loss) (68) (180)
Securities held to maturity:    
Less than 12 months - Fair value 351 12,724
Less than 12 months - Unrealized (loss) (1) (211)
12 months or more - Fair value 0 0
12 months or more - Unrealized (loss) 0 0
Fair Value 351 12,724
Unrealized (Loss) (1) (211)
Corporate debt securities    
Securities held to maturity:    
Less than 12 months - Fair value 1,488 1,486
Less than 12 months - Unrealized (loss) (12) (14)
12 months or more - Fair value 0 0
12 months or more - Unrealized (loss) 0 0
Fair Value 1,488 1,486
Unrealized (Loss) $ (12) $ (14)