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Investment Securities - Summary of unrealized losses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]    
Available-for-sale Securities, Fair Value, Less Than 12 Months, Total $ 8,168 $ 18,423
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months, Total (12) (192)
Available-for-sale Securities, Fair Value, 12 Months or Greater, Total 10,713 23,230
Available-for-sale Securities, Unrealized Losses, 12 months or Greater, Total (114) (832)
Fair Value, Total 18,881 41,653
Unrealized Losses, Total (126) (1,024)
State and municipal [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held to maturity, Fair Value, Less Than 12 Months 1,667 6,278
Held to maturity, Unrealized Losses, Less Than 12 Months (8) (105)
Held to maturity, Fair Value 12 Months or Greater   2,402
Held to maturity, Unrealized Losses, 12 Months or Greater   (35)
Fair Value, Total 1,667 8,680
Unrealized Losses, Total (8) (140)
U.S. Treasury and agencies [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Available-for-sale Securities, Fair Value, 12 Months or Greater 2,829 3,167
Available-for-sale Securities, Unrealized Losses, 12 months or Greater (46) (208)
Fair Value, Total 2,829 3,167
Unrealized Losses, Total (46) (208)
Mortgage backed [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Available-for-sale Securities, Fair Value, Less Than 12 Months 6,251 10,031
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months (4) (51)
Available-for-sale Securities, Fair Value, 12 Months or Greater 6,986 17,173
Available-for-sale Securities, Unrealized Losses, 12 months or Greater (66) (577)
Fair Value, Total 13,237 27,204
Unrealized Losses, Total (70) (628)
Corporate bonds [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Available-for-sale Securities, Fair Value, Less Than 12 Months 250 2,114
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months   (36)
Available-for-sale Securities, Fair Value, 12 Months or Greater 898 488
Available-for-sale Securities, Unrealized Losses, 12 months or Greater (2) (12)
Fair Value, Total 1,148 2,602
Unrealized Losses, Total $ (2) $ (48)