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Allowance for Credit Losses, Credit Quality and Other - Presentation of TDR's on Non-Accrual Status (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($)
Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	$ 261
Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans	529
Interest Only
Financing Receivable, Modifications [Line Items]
Payment default loans	28
Combination Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	413
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 | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans	0
Commercial real estate loans | Non-farm/non-residential | Interest Only
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	255
Residential real estate loans | Residential 1-4 family | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans	518
Residential real estate loans | Residential 1-4 family | Interest Only
Financing Receivable, Modifications [Line Items]
Payment default loans	0
Residential real estate loans | Residential 1-4 family | Combination Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	413
Total real estate | Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	255
Total real estate | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans	518
Total real estate | Interest Only
Financing Receivable, Modifications [Line Items]
Payment default loans	0
Total real estate | Combination Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	413
Consumer | Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	6
Consumer | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans	11
Consumer | Interest Only
Financing Receivable, Modifications [Line Items]
Payment default loans	0
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 | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans	0
Commercial and industrial | Interest Only
Financing Receivable, Modifications [Line Items]
Payment default loans	28
Commercial and industrial | Combination Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	$ 0

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