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Investment Securities and Other Investments - Summary of Fair Value and Gross Unrealized Losses of Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Fair Value, Less Than 12 Months, Total | $ 28,234 | $ 18,423
Unrealized Losses, Less than 12 Months, Total | (84) | (192)
Fair Value, 12 Months or Greater, Total | 8,193 | 23,230
Unrealized Losses, 12 Months or Greater, Total | (125) | (832)
Fair Value, Total | 36,427 | 41,653
Unrealized Losses, Total | (209) | (1,024)
State and Municipal [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Held to maturity, Fair Value, Less Than 12 Months | 333 | 6,278
Held to maturity, Unrealized Losses, Less Than 12 Months | (2) | (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 | 333 | 8,680
Unrealized Losses, Total | (2) | (140)
U.S. Treasury and Agencies [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-sale Securities, Fair Value, 12 Months or Greater | 1,949 | 3,167
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (51) | (208)
Fair Value, Total | 1,949 | 3,167
Unrealized Losses, Total | (51) | (208)
Corporate Bonds [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-sale Securities, Fair Value, Less Than 12 Months |  | 2,114
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months |  | (36)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 896 | 488
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (4) | (12)
Fair Value, Total | 896 | 2,602
Unrealized Losses, Total | (4) | (48)
Mortgage Backed Securities [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-sale Securities, Fair Value, Less Than 12 Months | 27,901 | 10,031
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (82) | (51)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 5,348 | 17,173
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (70) | (577)
Fair Value, Total | 33,249 | 27,204
Unrealized Losses, Total | $ (152) | $ (628)

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