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Securities - Summary of Investments in an Unrealized Loss Position that were Temporarily Impaired (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Securities available for sale:    
Less than 12 months - Fair value $ 369 $ 30,111
Less than 12 months - Unrealized (loss) (2) (240)
12 months or more - Fair value 69,174 54,779
12 months or more - Unrealized (loss) (1,232) (2,125)
Fair Value 69,543 84,890
Unrealized (Loss) (1,234) (2,365)
Securities held to maturity:    
Less than 12 months - Fair value 0 5,326
Less than 12 months - Unrealized (loss) 0 (37)
12 months or more - Fair value 14,622 32,666
12 months or more - Unrealized (loss) (334) (1,006)
Fair Value 14,622 37,992
Unrealized (Loss) (334) (1,043)
Total securities, Less than 12 months - Fair value 369 35,437
Total securities, Less than 12 months - Unrealized (loss) (2) (277)
Total securities, 12 months or more - Fair value 83,796 87,445
Total securities, 12 months or more - Unrealized (loss) (1,566) (3,131)
Total securities, Total fair value 84,165 122,882
Total unrealized (loss) (1,568) (3,408)
U.S. agency and mortgage-backed securities    
Securities available for sale:    
Less than 12 months - Fair value 369 26,350
Less than 12 months - Unrealized (loss) (2) (215)
12 months or more - Fair value 60,381 49,652
12 months or more - Unrealized (loss) (1,072) (1,851)
Fair Value 60,750 76,002
Unrealized (Loss) (1,074) (2,066)
Securities held to maturity:    
Less than 12 months - Fair value 0 0
Less than 12 months - Unrealized (loss) 0 0
12 months or more - Fair value 13,861 26,551
12 months or more - Unrealized (loss) (332) (869)
Fair Value 13,861 26,551
Unrealized (Loss) (332) (869)
Obligations of states and political subdivisions    
Securities available for sale:    
Less than 12 months - Fair value 0 3,761
Less than 12 months - Unrealized (loss) 0 (25)
12 months or more - Fair value 8,793 5,127
12 months or more - Unrealized (loss) (160) (274)
Fair Value 8,793 8,888
Unrealized (Loss) (160) (299)
Securities held to maturity:    
Less than 12 months - Fair value 0 5,326
Less than 12 months - Unrealized (loss) 0 (37)
12 months or more - Fair value 761 6,115
12 months or more - Unrealized (loss) (2) (137)
Fair Value 761 11,441
Unrealized (Loss) $ (2) $ (174)