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Investment Securities - Summary of Unrealized Losses (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Fair Value, Less Than 12 Months, Total | $ 14,125 | $ 28,234
Unrealized Losses, Less than 12 Months, Total | (2,366) | (84)
Fair Value, 12 Months or Greater, Total | 2,323 | 8,193
Unrealized Losses, 12 Months or Greater, Total | (36) | (125)
Fair Value, Total | 16,448 | 36,427
Unrealized Losses, Total | (2,402) | (209)
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 | 424 | 333
Held to maturity, Unrealized Losses, Less Than 12 Months | (3) | (2)
Fair Value, Total | 424 | 333
Unrealized Losses, Total | (3) | (2)
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 | 985 | 1,949
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (15) | (51)
Fair Value, Total | 985 | 1,949
Unrealized Losses, Total | (15) | (51)
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 | 9,630 | 27,901
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (1,934) | (82)
Available-for-sale Securities, Fair Value, 12 Months or Greater | 942 | 5,348
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (17) | (70)
Fair Value, Total | 10,572 | 33,249
Unrealized Losses, Total | (1,951) | (152)
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 | 4,071 |
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months | (429) |
Available-for-sale Securities, Fair Value, 12 Months or Greater | 396 | 896
Available-for-sale Securities, Unrealized Losses, 12 months or Greater | (4) | (4)
Fair Value, Total | 4,467 | 896
Unrealized Losses, Total | $ (433) | $ (4)

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