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Short-Term and Other Borrowings - Summary of Federal Funds Purchased, Securities Sold Under Agreements to Repurchase and Other Short-term Borrowings (Detail) - Short Term Borrowings, FHLB advances [Member] - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Short-term Debt [Line Items]
Outstanding balance	$ 431,500,000		$ 431,500,000		$ 393,700,000
Interest rate on balance	5.45%		5.45%		4.24%
Maximum indebtedness	$ 431,500,000	$ 56,000,000	$ 540,000,000	$ 56,000,000
Average balance	$ 233,547,000	$ 6,713,000	$ 282,214,000	$ 2,380,000
Average rate paid	5.51%	2.84%	5.03%	2.75%

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- Definition

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.

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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.

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- Definition

The portion of the carrying amount of short-term borrowings outstanding as of the balance sheet date, which accrues interest at a rate subject to change from time to time.

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Weighted average interest rate of short-term debt outstanding calculated over time.

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- Definition

For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, the maximum amount borrowed at any time during the period.

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