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Derivatives - Summary of Identified Hedge Layers (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Identified Hedge [Member] | 3-Month LIBOR Hedged Agreement One [Member]
Derivative [Line Items]
Notional Amount	$ 15,000
Cash & securities exposure hedged amount	$ 15,000
Derivative, inception date	Jul. 01, 2019
Derivative, maturity date	Jul. 01, 2022
Identified Hedge [Member] | 3-Month LIBOR Hedged Agreement Two [Member]
Derivative [Line Items]
Notional Amount	$ 25,000
Cash & securities exposure hedged amount	$ 25,000
Derivative, inception date	Aug. 02, 2019
Derivative, maturity date	Feb. 02, 2023
Identified Hedge [Member] | 3-Month LIBOR Hedged Agreement Three [Member]
Derivative [Line Items]
Notional Amount	$ 10,000
Cash & securities exposure hedged amount	$ 10,000
Derivative, inception date	Aug. 29, 2019
Derivative, maturity date	Aug. 29, 2023
New Hedges [Member] | 3-Month LIBOR Hedged Agreement One [Member]
Derivative [Line Items]
Notional Amount	$ 15,000
Cash & securities exposure hedged amount	$ 15,000
Derivative, inception date	Jul. 01, 2022
Derivative, maturity date	Jul. 01, 2032
New Hedges [Member] | 3-Month LIBOR Hedged Agreement Two [Member]
Derivative [Line Items]
Notional Amount	$ 25,000
Cash & securities exposure hedged amount	$ 25,000
Derivative, inception date	Feb. 02, 2023
Derivative, maturity date	Feb. 02, 2033
New Hedges [Member] | 3-Month LIBOR Hedged Agreement Three [Member]
Derivative [Line Items]
Notional Amount	$ 10,000
Cash & securities exposure hedged amount	$ 10,000
Derivative, inception date	Aug. 29, 2023
Derivative, maturity date	Aug. 29, 2033
Additional Hedges [Member] | 3-Month LIBOR Hedged Agreement One [Member]
Derivative [Line Items]
Notional Amount	$ 20,000
Cash & securities exposure hedged amount	$ 20,000
Derivative, inception date	Mar. 13, 2020
Derivative, maturity date	Mar. 13, 2030
Additional Hedges [Member] | 3-Month LIBOR Hedged Agreement Two [Member]
Derivative [Line Items]
Notional Amount	$ 35,000
Cash & securities exposure hedged amount	$ 35,000
Derivative, inception date	May 06, 2020
Derivative, maturity date	May 06, 2027
Additional Hedges [Member] | 3-Month LIBOR Hedged Agreement Three [Member]
Derivative [Line Items]
Notional Amount	$ 10,000
Cash & securities exposure hedged amount	$ 10,000
Derivative, inception date	May 29, 2020
Derivative, maturity date	May 29, 2027

X

- Definition

Amount of hedged item in hedging relationship. Excludes hedged asset or liability.

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Definition

Date the entity entered into the derivative contract, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

+ Details

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- Details

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