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Securities - Summary of Investments in an Unrealized Loss Position that were Temporarily Impaired (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Securities available for sale:    
Less than 12 months - Fair value $ 30,111 $ 34,432
Less than 12 months - Unrealized (loss) (240) (339)
12 months or more - Fair value 54,779 32,323
12 months or more - Unrealized (loss) (2,125) (1,153)
Fair Value 84,890 66,755
Unrealized (Loss) (2,365) (1,492)
Securities held to maturity:    
Less than 12 months - Fair value 5,326 25,190
Less than 12 months - Unrealized (loss) (37) (250)
12 months or more - Fair value 32,666 13,297
12 months or more - Unrealized (loss) (1,006) (346)
Fair Value 37,992 38,487
Unrealized (Loss) (1,043) (596)
Total securities, Less than 12 months - Fair value 35,437 59,622
Total securities, Less than 12 months - Unrealized (loss) (277) (589)
Total securities, 12 months or more - Fair value 87,445 45,620
Total securities, 12 months or more - Unrealized (loss) (3,131) (1,499)
Total securities, Fair value 122,882 105,242
Total securities, Unrealized (loss) (3,408) (2,088)
U.S. agency and mortgage-backed securities    
Securities available for sale:    
Less than 12 months - Fair value 26,350 29,963
Less than 12 months - Unrealized (loss) (215) (286)
12 months or more - Fair value 49,652 30,362
12 months or more - Unrealized (loss) (1,851) (1,051)
Fair Value 76,002 60,325
Unrealized (Loss) (2,066) (1,337)
Securities held to maturity:    
Less than 12 months - Fair value 0 18,301
Less than 12 months - Unrealized (loss) 0 (205)
12 months or more - Fair value 26,551 13,297
12 months or more - Unrealized (loss) (869) (346)
Fair Value 26,551 31,598
Unrealized (Loss) (869) (551)
Obligations of states and political subdivisions    
Securities available for sale:    
Less than 12 months - Fair value 3,761 4,469
Less than 12 months - Unrealized (loss) (25) (53)
12 months or more - Fair value 5,127 1,961
12 months or more - Unrealized (loss) (274) (102)
Fair Value 8,888 6,430
Unrealized (Loss) (299) (155)
Securities held to maturity:    
Less than 12 months - Fair value 5,326 6,889
Less than 12 months - Unrealized (loss) (37) (45)
12 months or more - Fair value 6,115 0
12 months or more - Unrealized (loss) (137) 0
Fair Value 11,441 6,889
Unrealized (Loss) $ (174) $ (45)