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Securities - Summary of Investments in an Unrealized Loss Position that were Temporarily Impaired (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Securities available for sale:    
Less than 12 months - Fair value $ 44,894 $ 66,073
Less than 12 months - Unrealized (loss) (546) (1,429)
12 months or more - Fair value 4,964 5,499
12 months or more - Unrealized (loss) (151) (208)
Fair Value 49,858 71,572
Unrealized (Loss) (697) (1,637)
Securities held to maturity:    
Less than 12 months - Fair value 19,451 48,980
Less than 12 months - Unrealized (loss) (210) (708)
12 months or more - Fair value 0 0
12 months or more - Unrealized (loss) 0 0
Fair Value 19,451 48,980
Unrealized (Loss) (210) (708)
Total securities, Less than 12 months - Fair value 64,345 115,053
Total securities, Less than 12 months - Unrealized (loss) (756) (2,137)
Total securities, 12 months or more - Fair value 4,964 5,499
Total securities, 12 months or more - Unrealized (loss) (151) (208)
Total securities, Total fair value 69,309 120,552
Total unrealized (loss) (907) (2,345)
U.S. agency and mortgage-backed securities    
Securities available for sale:    
Less than 12 months - Fair value 42,325 60,943
Less than 12 months - Unrealized (loss) (493) (1,249)
12 months or more - Fair value 4,964 5,499
12 months or more - Unrealized (loss) (151) (208)
Fair Value 47,289 66,442
Unrealized (Loss) (644) (1,457)
Securities held to maturity:    
Less than 12 months - Fair value 17,961 34,770
Less than 12 months - Unrealized (loss) (200) (483)
12 months or more - Fair value 0 0
12 months or more - Unrealized (loss) 0 0
Fair Value 17,961 34,770
Unrealized (Loss) (200) (483)
Obligations of states and political subdivisions    
Securities available for sale:    
Less than 12 months - Fair value 2,569 5,130
Less than 12 months - Unrealized (loss) (53) (180)
12 months or more - Fair value 0 0
12 months or more - Unrealized (loss) 0 0
Fair Value 2,569 5,130
Unrealized (Loss) (53) (180)
Securities held to maturity:    
Less than 12 months - Fair value   12,724
Less than 12 months - Unrealized (loss)   (211)
12 months or more - Fair value   0
12 months or more - Unrealized (loss)   0
Fair Value   12,724
Unrealized (Loss)   (211)
Corporate debt securities    
Securities held to maturity:    
Less than 12 months - Fair value 1,490 1,486
Less than 12 months - Unrealized (loss) (10) (14)
12 months or more - Fair value 0 0
12 months or more - Unrealized (loss) 0 0
Fair Value 1,490 1,486
Unrealized (Loss) $ (10) $ (14)