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Available for Sale Securities - Summary of Gross Unrealized Losses on Securities Available-for-sale and Fair Values (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 20,276 $ 2,613
Unrealized Loss (138) (6)
Fair Value 17,485 56,851
Unrealized Loss (258) (2,195)
Fair Value 37,761 59,464
Unrealized Loss (396) (2,201)
US States and Political Subdivisions Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 2,052 1,567
Unrealized Loss (14) (5)
Fair Value 667 6,909
Unrealized Loss (6) (199)
Fair Value 2,719 8,476
Unrealized Loss (20) (204)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 15,830 29
Unrealized Loss (106)  
Fair Value 16,747 49,549
Unrealized Loss (251) (1,992)
Fair Value 32,577 49,578
Unrealized Loss (357) (1,992)
Collateralized Mortgage Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair Value   204
Fair Value   147
Unrealized Loss   (1)
Fair Value   351
Unrealized Loss   (1)
Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 2,394 813
Unrealized Loss (18) (1)
Fair Value 71  
Unrealized Loss (1)  
Fair Value 2,465 813
Unrealized Loss $ (19) (1)
Certificates of Deposit [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair Value   246
Unrealized Loss   (3)
Fair Value   246
Unrealized Loss   $ (3)