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Fair Value - Summary of Financial Assets Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities | $ 113,889 | $ 108,571
Fair Value, Recurring [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities | 113,889 | 108,571
Fair Value, Recurring [Member] | State and Municipal [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities | 14,011 |
Fair Value, Recurring [Member] | U.S. Treasury and Agencies [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities | 2,466 | 2,449
Fair Value, Recurring [Member] | Mortgage Backed Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities | 79,491 | 95,485
Fair Value, Recurring [Member] | Corporate Bonds [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities | 17,921 | 10,637
Fair Value, Recurring [Member] | Level 2 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities | 113,889 | 108,571
Fair Value, Recurring [Member] | Level 2 [Member] | State and Municipal [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities | 14,011 |
Fair Value, Recurring [Member] | Level 2 [Member] | U.S. Treasury and Agencies [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities | 2,466 | 2,449
Fair Value, Recurring [Member] | Level 2 [Member] | Mortgage Backed Securities [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities | 79,491 | 95,485
Fair Value, Recurring [Member] | Level 2 [Member] | Corporate Bonds [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities | $ 17,921 | $ 10,637

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