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Fair Value - Summary of Financial Assets Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Total securities available for sale | $ 360,098 | $ 109,475 |
Mortgage derivative asset | 3,456 | 5,293 | [1]
Mortgage derivative liability | 0 | 1,600 |
State and Municipal [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Securities available for sale | 41,852 | 14,259 |
U.S. Treasury and Agencies [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Securities available for sale | 48,548 | 2,409 |
Corporate Bonds [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Securities available for sale | 30,775 | 20,172 |
Fair Value, Recurring [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Total securities available for sale | 360,098 | 109,475 |
Rabbi trust assets | 963 |  |
Mortgage derivative asset | 3,456 | 5,293 |
Mortgage derivative liability |  | 1,569 |
Fair Value, Recurring [Member] | State and Municipal [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Securities available for sale | 41,852 | 14,259 |
Fair Value, Recurring [Member] | U.S. Treasury and Agencies [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Securities available for sale | 48,548 | 2,409 |
Fair Value, Recurring [Member] | Mortgage Backed Securities [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Securities available for sale | 238,923 | 72,635 |
Fair Value, Recurring [Member] | Corporate Bonds [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Securities available for sale | 30,775 | 20,172 |
Fair Value, Recurring [Member] | Interest Rate Swap Agreement [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Interest rate swap asset | 5,838 | 1,716 |
Interest rate swap liability | 1,239 | 2,735 |
Fair Value, Recurring [Member] | Level 1 [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Rabbi trust assets | 963 |  |
Fair Value, Recurring [Member] | Level 2 [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Total securities available for sale | 360,098 | 109,475 |
Mortgage derivative asset | 3,456 | 5,293 |
Mortgage derivative liability |  | 1,569 |
Fair Value, Recurring [Member] | Level 2 [Member] | State and Municipal [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Securities available for sale | 41,852 | 14,259 |
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] |  |  |
Securities available for sale | 48,548 | 2,409 |
Fair Value, Recurring [Member] | Level 2 [Member] | Mortgage Backed Securities [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Securities available for sale | 238,923 | 72,635 |
Fair Value, Recurring [Member] | Level 2 [Member] | Corporate Bonds [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Securities available for sale | 30,775 | 20,172 |
Fair Value, Recurring [Member] | Level 2 [Member] | Interest Rate Swap Agreement [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Interest rate swap asset | 5,838 | 1,716 |
Interest rate swap liability | $ 1,239 | $ 2,735 |
[1] | Derived from audited December 31, 2020 Consolidated Financial Statements.

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