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Fair Value of Assets and Liabilities - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |  |  |
Interest-bearing deposits | $ 1,500,000 |  |  |
Fair Value Recurring [Member] |  |  |  |
Assets |  |  |  |
Interest-bearing deposits | 1,500,000 |  |  |
Available for sale investment securities | 46,792,000 | [1] | $ 48,998,000 | [2]
Total | 48,292,000 |  | 48,998,000 |
Fair Value Recurring [Member] | Level 2 [Member] |  |  |  |
Assets |  |  |  |
Interest-bearing deposits | 1,500,000 |  |  |
Available for sale investment securities | 46,792,000 | [1] | 48,998,000 | [2]
Total | $ 48,292,000 |  | $ 48,998,000 |
[1] | Total unrealized gains of $1,013, net of tax, was included in accumulated other comprehensive income (loss) for the twelve months ended December 31, 2020 related to these assets.
[2] | Total unrealized gains of $1,081, net of tax, was included in accumulated other comprehensive income (loss) for the twelve months ended December 31, 2019 related to these assets.

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