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Derivative Instruments and Hedging Activities - Cumulative Basis Adjustment for Fair Value Hedges (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
AFS debt securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amortized Cost	$ 22,500	$ 22,500
Unamortized basis adjustments from interest rate swaps designated as fair value hedges of long-term advances from FHLB	764	941
Deposits
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amortized Cost	300,000	300,000
Unamortized basis adjustments from interest rate swaps designated as fair value hedges of long-term advances from FHLB	1,079	1,432
FHLB advances
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amortized Cost	700,000	700,000
Unamortized basis adjustments from interest rate swaps designated as fair value hedges of long-term advances from FHLB	$ (4,912)	$ 3,206

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No definition available.

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- Definition

Amount of asset hedged in fair value hedging relationship.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 181
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480401/815-10-55-181

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4EE
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4EE

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Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 181
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480401/815-10-55-181

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4EE
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4EE

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