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Allowance for Credit Losses - Additional Information (Detail) - USD ($)		12 Months Ended
	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]
Reserve for lending-related commitments	$ 35,075,000	$ 35,075,000	$ 34,911,000	$ 44,706,000
Maximum Period Related To Accrual Of Interest On Discontinued Loans		90 days
Accrued interest receivable net of allowance for credit loss	$ 109,232,000	$ 109,232,000	102,412,000
Allowance for credit losses at acquisition		$ 17,518,000	0	$ 0
Percentage Of Allowance For Loan And Lease Losses		9.44%
Allowance for Loan and Lease Losses, Period Increase (Decrease)		$ 25,674,000
UBSI Piedmont Bancorp [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses at acquisition		18,726,000
Financing receivable non purchased with credit deterioration allowance for credit loss at acquisition date		17,518,000
2027 [member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Percentage of projection for real GDP	2.00%
Percentage of unemployment rate	4.20%
2026 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Percentage Points Increase In Unemployment Rate	4.40%
Percentage points reduction in gdp projection.	2.30%
Percentage of projection for real GDP	1.80%
Accrued Income Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Accrued interest receivable net of allowance for credit loss	$ 95,960,000,000	$ 95,960,000,000	$ 87,062,000,000

X

- Definition

Financing receivable non purchased with credit deterioration allowance for credit loss at acquisition date.

+ References

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- Definition

Maximum period of time related to the accrual of interest on loans that have become past due.

+ References

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The amount of increase or decrease in the allowance for loan and lease losses expressed as a percentage.

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Projection of the growth rate of the real gross domestic product (GDP) based on a direct comparison of the GDP from one year to the next.

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Percentage points increase in unemployment rate.

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Percentage points reduction in gdp projection.

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- Definition

Represents an accrued liability that is appropriate to cover estimated credit losses on off-balance sheet loan commitments, standby letters of credit, and guarantees.

+ References

No definition available.

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- Definition

Amount, after allowance for credit loss, of accrued interest on financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
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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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Amount of increase (decrease) in allowance for credit loss on financing receivable.

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Amount of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration.

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