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Borrowings - Schedule of Information Regarding FHLB Advances Outstanding (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	[1]
Federal Home Loan Bank Advances Branch Of F H L B Bank [Line Items]
Balance	$ 125,115	$ 115,000
Convertible [Member]
Federal Home Loan Bank Advances Branch Of F H L B Bank [Line Items]
Balance	$ 10,115
Originated Date	Feb. 28, 2020
Stated Interest Rate	0.56%
Maturity Date	Feb. 28, 2030
Fixed Rate Credit One [Member]
Federal Home Loan Bank Advances Branch Of F H L B Bank [Line Items]
Balance	$ 15,000
Originated Date	Jul. 01, 2021
Stated Interest Rate	0.17%
Maturity Date	Oct. 01, 2021
Fixed Rate Credit Two [Member]
Federal Home Loan Bank Advances Branch Of F H L B Bank [Line Items]
Balance	$ 25,000
Originated Date	Aug. 02, 2021
Stated Interest Rate	0.16%
Maturity Date	Nov. 02, 2021
Fixed Rate Credit Three [Member]
Federal Home Loan Bank Advances Branch Of F H L B Bank [Line Items]
Balance	$ 35,000
Originated Date	Aug. 06, 2021
Stated Interest Rate	0.16%
Maturity Date	Nov. 08, 2021
Fixed Rate Credit Four [Member]
Federal Home Loan Bank Advances Branch Of F H L B Bank [Line Items]
Balance	$ 10,000
Originated Date	Aug. 30, 2021
Stated Interest Rate	0.16%
Maturity Date	Nov. 30, 2021
Fixed Rate Credit Five [Member]
Federal Home Loan Bank Advances Branch Of F H L B Bank [Line Items]
Balance	$ 10,000
Originated Date	Aug. 30, 2021
Stated Interest Rate	0.16%
Maturity Date	Nov. 30, 2021
Fixed Rate Credit Six [Member]
Federal Home Loan Bank Advances Branch Of F H L B Bank [Line Items]
Balance	$ 20,000
Originated Date	Sep. 17, 2021
Stated Interest Rate	0.19%
Maturity Date	Dec. 17, 2021
[1] Derived from audited December 31, 2020 Consolidated Financial Statements.

X

- Definition

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date the debt instrument was issued, in YYYY-MM-DD format.

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