Short-Term Borrowings - Short-Term Borrowings and the Related Weighted-Average Interest Rates (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Short-term Debt [Line Items]
Short-term borrowings	$ 196,095	$ 160,698
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Short-term borrowings	0	0
Securities Sold Under Agreements to Repurchase [Member]
Short-term Debt [Line Items]
Short-term borrowings	$ 196,095	$ 160,698

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
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-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
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Name:	us-gaap_ShortTermBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant