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Allowance for Credit Losses, Credit Quality and Other - Presentation of TDR's on Non-Accrual Status (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($)
Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	$ 247
Combination Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	960
Commercial real estate loans | Non-farm/non-residential | Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	0
Commercial real estate loans | Non-farm/non-residential | Combination Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	0
Residential real estate loans | Residential 1-4 family | Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	241
Residential real estate loans | Residential 1-4 family | Combination Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	959
Total real estate | Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	241
Total real estate | Combination Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	959
Consumer | Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	6
Consumer | Combination Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	0
Commercial and industrial | Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	0
Commercial and industrial | Combination Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	$ 1

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