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Securities - Summary of Investments in an Unrealized Loss Position that were Temporarily Impaired (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Securities available for sale:    
Less than 12 months - Fair value $ 54,988 $ 34,432
Less than 12 months - Unrealized (loss) (1,090) (339)
12 months or more - Fair value 31,045 32,323
12 months or more - Unrealized (loss) (1,421) (1,153)
Fair Value 86,033 66,755
Unrealized (Loss) (2,511) (1,492)
Securities held to maturity:    
Less than 12 months - Fair value 29,932 25,190
Less than 12 months - Unrealized (loss) (673) (250)
12 months or more - Fair value 12,497 13,297
12 months or more - Unrealized (loss) (506) (346)
Fair Value 42,429 38,487
Unrealized (Loss) (1,179) (596)
Total securities, Less than 12 months - Fair value 84,920 59,622
Total securities, Less than 12 months - Unrealized (loss) (1,763) (589)
Total securities, 12 months or more - Fair value 43,542 45,620
Total securities, 12 months or more - Unrealized (loss) (1,927) (1,499)
Total securities, Total fair value 128,462 105,242
Total unrealized (loss) (3,690) (2,088)
U.S. agency and mortgage-backed securities    
Securities available for sale:    
Less than 12 months - Fair value 47,868 29,963
Less than 12 months - Unrealized (loss) (941) (286)
12 months or more - Fair value 29,121 30,362
12 months or more - Unrealized (loss) (1,284) (1,051)
Fair Value 76,989 60,325
Unrealized (Loss) (2,225) (1,337)
Securities held to maturity:    
Less than 12 months - Fair value 17,269 18,301
Less than 12 months - Unrealized (loss) (478) (205)
12 months or more - Fair value 12,497 13,297
12 months or more - Unrealized (loss) (506) (346)
Fair Value 29,766 31,598
Unrealized (Loss) (984) (551)
Obligations of states and political subdivisions    
Securities available for sale:    
Less than 12 months - Fair value 7,120 4,469
Less than 12 months - Unrealized (loss) (149) (53)
12 months or more - Fair value 1,924 1,961
12 months or more - Unrealized (loss) (137) (102)
Fair Value 9,044 6,430
Unrealized (Loss) (286) (155)
Securities held to maturity:    
Less than 12 months - Fair value 11,166 6,889
Less than 12 months - Unrealized (loss) (192) (45)
12 months or more - Fair value 0 0
12 months or more - Unrealized (loss) 0 0
Fair Value 11,166 6,889
Unrealized (Loss) (192) $ (45)
Corporate debt securities    
Securities held to maturity:    
Less than 12 months - Fair value 1,497  
Less than 12 months - Unrealized (loss) (3)  
12 months or more - Fair value 0  
12 months or more - Unrealized (loss) 0  
Fair Value 1,497  
Unrealized (Loss) $ (3)