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Investment Securities - Summary of unrealized losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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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)

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