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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
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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