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Securities - Summary of Investments in an Unrealized Loss Position that were Temporarily Impaired (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Securities available for sale:    
Less than 12 months - Fair value $ 63,455 $ 34,432
Less than 12 months - Unrealized (loss) (1,462) (339)
12 months or more - Fair value 34,806 32,323
12 months or more - Unrealized (loss) (2,026) (1,153)
Fair Value 98,261 66,755
Unrealized (Loss) (3,488) (1,492)
Securities held to maturity:    
Less than 12 months - Fair value 22,628 25,190
Less than 12 months - Unrealized (loss) (654) (250)
12 months or more - Fair value 18,676 13,297
12 months or more - Unrealized (loss) (885) (346)
Fair Value 41,304 38,487
Unrealized (Loss) (1,539) (596)
Total securities, Less than 12 months - Fair value 86,083 59,622
Total securities, Less than 12 months - Unrealized (loss) (2,116) (589)
Total securities, 12 months or more - Fair value 53,482 45,620
Total securities, 12 months or more - Unrealized (loss) (2,911) (1,499)
Total securities, Total fair value 139,565 105,242
Total unrealized (loss) (5,027) (2,088)
U.S. agency and mortgage-backed securities    
Securities available for sale:    
Less than 12 months - Fair value 55,198 29,963
Less than 12 months - Unrealized (loss) (1,315) (286)
12 months or more - Fair value 31,743 30,362
12 months or more - Unrealized (loss) (1,782) (1,051)
Fair Value 86,941 60,325
Unrealized (Loss) (3,097) (1,337)
Securities held to maturity:    
Less than 12 months - Fair value 8,687 18,301
Less than 12 months - Unrealized (loss) (334) (205)
12 months or more - Fair value 18,338 13,297
12 months or more - Unrealized (loss) (874) (346)
Fair Value 27,025 31,598
Unrealized (Loss) (1,208) (551)
Obligations of states and political subdivisions    
Securities available for sale:    
Less than 12 months - Fair value 8,257 4,469
Less than 12 months - Unrealized (loss) (147) (53)
12 months or more - Fair value 3,063 1,961
12 months or more - Unrealized (loss) (244) (102)
Fair Value 11,320 6,430
Unrealized (Loss) (391) (155)
Securities held to maturity:    
Less than 12 months - Fair value 12,452 6,889
Less than 12 months - Unrealized (loss) (309) (45)
12 months or more - Fair value 338 0
12 months or more - Unrealized (loss) (11) 0
Fair Value 12,790 6,889
Unrealized (Loss) (320) $ (45)
Corporate debt securities    
Securities held to maturity:    
Less than 12 months - Fair value 1,489  
Less than 12 months - Unrealized (loss) (11)  
12 months or more - Fair value 0  
12 months or more - Unrealized (loss) 0  
Fair Value 1,489  
Unrealized (Loss) $ (11)