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Securities - Summary of Investments in an Unrealized Loss Position that were Temporarily Impaired (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Securities available for sale:    
Less than 12 months - Fair value $ 69,789 $ 34,432
Less than 12 months - Unrealized (loss) (1,329) (339)
12 months or more - Fair value 30,741 32,323
12 months or more - Unrealized (loss) (1,527) (1,153)
Fair Value 100,530 66,755
Unrealized (Loss) (2,856) (1,492)
Securities held to maturity:    
Less than 12 months - Fair value 27,617 25,190
Less than 12 months - Unrealized (loss) (690) (250)
12 months or more - Fair value 13,603 13,297
12 months or more - Unrealized (loss) (612) (346)
Fair Value 41,220 38,487
Unrealized (Loss) (1,302) (596)
Total securities, Less than 12 months - Fair value 97,406 59,622
Total securities, Less than 12 months - Unrealized (loss) (2,019) (589)
Total securities, 12 months or more - Fair value 44,344 45,620
Total securities, 12 months or more - Unrealized (loss) (2,139) (1,499)
Total securities, Total fair value 141,750 105,242
Total unrealized (loss) (4,158) (2,088)
U.S. agency and mortgage-backed securities    
Securities available for sale:    
Less than 12 months - Fair value 61,734 29,963
Less than 12 months - Unrealized (loss) (1,200) (286)
12 months or more - Fair value 28,279 30,362
12 months or more - Unrealized (loss) (1,380) (1,051)
Fair Value 90,013 60,325
Unrealized (Loss) (2,580) (1,337)
Securities held to maturity:    
Less than 12 months - Fair value 14,964 18,301
Less than 12 months - Unrealized (loss) (499) (205)
12 months or more - Fair value 13,603 13,297
12 months or more - Unrealized (loss) (612) (346)
Fair Value 28,567 31,598
Unrealized (Loss) (1,111) (551)
Obligations of states and political subdivisions    
Securities available for sale:    
Less than 12 months - Fair value 8,055 4,469
Less than 12 months - Unrealized (loss) (129) (53)
12 months or more - Fair value 2,462 1,961
12 months or more - Unrealized (loss) (147) (102)
Fair Value 10,517 6,430
Unrealized (Loss) (276) (155)
Securities held to maturity:    
Less than 12 months - Fair value 11,155 6,889
Less than 12 months - Unrealized (loss) (189) (45)
12 months or more - Fair value 0 0
12 months or more - Unrealized (loss) 0 0
Fair Value 11,155 6,889
Unrealized (Loss) (189) $ (45)
Corporate debt securities    
Securities held to maturity:    
Less than 12 months - Fair value 1,498  
Less than 12 months - Unrealized (loss) (2)  
12 months or more - Fair value 0  
12 months or more - Unrealized (loss) 0  
Fair Value 1,498  
Unrealized (Loss) $ (2)