Commercial loans terms.

No definition available.

Name:	homb_CommercialLoansTerms
Namespace Prefix:	homb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Financing inventory percentage.

+ References

No definition available.

+ Details

Name:	homb_FinancingInventoryPercentage
Namespace Prefix:	homb_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Financing receivable collateral dependent amortized cost.

+ References

No definition available.

+ Details

Name:	homb_FinancingReceivableCollateralDependentAmortizedCost
Namespace Prefix:	homb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivable, Excluding Accrued Interest, Modified, After 12 Months, Nonaccrual

+ References

No definition available.

+ Details

Name:	homb_FinancingReceivableExcludingAccruedInterestModifiedAfter12MonthsNonaccrual
Namespace Prefix:	homb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Loan-to-value ratio.

+ References

No definition available.

+ Details

Name:	homb_LoanToValueRatio
Namespace Prefix:	homb_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Loans collateralized by first liens on real estate amortized period.

+ References

No definition available.

+ Details

Name:	homb_LoansCollateralizedByFirstLiensOnRealEstateAmortizedPeriod
Namespace Prefix:	homb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Loans collateralized by first liens on real estate balloon payments due period.

+ References

No definition available.

+ Details

Name:	homb_LoansCollateralizedByFirstLiensOnRealEstateBalloonPaymentsDuePeriod
Namespace Prefix:	homb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum Amount Of Loan Assessed For Impairment On Quarterly Basis

+ References

No definition available.

+ Details

Name:	homb_MinimumAmountOfLoanAssessedForImpairmentOnQuarterlyBasis
Namespace Prefix:	homb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of revolving loans convert to term loans.

+ References

No definition available.

+ Details

Name:	homb_NumberOfRevolvingLoansConvertToTermLoans
Namespace Prefix:	homb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of loan value of improved property.

+ References

No definition available.

+ Details

Name:	homb_PercentageOfLoanValueOfImprovedProperty
Namespace Prefix:	homb_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of loan value of land to be acquired and developed.

+ References

No definition available.

+ Details

Name:	homb_PercentageOfLoanValueOfLandToBeAcquiredAndDeveloped
Namespace Prefix:	homb_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of loan value of raw land.

+ References

No definition available.

+ Details

Name:	homb_PercentageOfLoanValueOfRawLand
Namespace Prefix:	homb_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Provision For Loan Losses Expensed on Unfunded Commitments

+ References

No definition available.

+ Details

Name:	homb_ProvisionForLoanLossesExpensedOnUnfundedCommitments
Namespace Prefix:	homb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Provision for Loan Losses Expensed on Unfunded Commitments Expense (Reversal)

+ References

No definition available.

+ Details

Name:	homb_ProvisionForLoanLossesExpensedOnUnfundedCommitmentsExpenseReversal
Namespace Prefix:	homb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Revolver loans converted to term loans.

+ References

No definition available.

+ Details

Name:	homb_RevolverLoansConvertedToTermLoans
Namespace Prefix:	homb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amortized cost excluding accrued interest, of financing receivable 12 months after modification for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPast12Months
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 33
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-33

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amortized cost of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

+ Details

Name:	us-gaap_FinancingReceivableNonaccrualNoAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of financing receivable balance that is past due.

+ References

No definition available.

+ Details

Name:	us-gaap_FinancingReceivablePercentPastDue1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amortized cost of financing receivable 90 days or more past due and still accruing. Excludes net investment in lease.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-7

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 80
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-80

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (3)
-Publisher SEC

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (2)
-Publisher SEC

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-15

+ Details

Name:	us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of credit loss expense (reversal of expense) for financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(11))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

Name:	us-gaap_ProvisionForLoanLossesExpensed
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=us-gaap_HurricaneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanRestructuringModificationNameAxis=homb_BorrowersExperiencingFinancialDifficultyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=homb_ConstructionLandDevelopmentAndOtherCommercialRealEstateLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=homb_ResidentialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=homb_CommercialAndIndustrialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Allowance for Credit Losses, Credit Quality and Other - Additional Information (Detail) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) loan	Sep. 30, 2023 USD ($) loan	Dec. 31, 2023 USD ($) loan
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for credit losses on loans	$ 18,200		$ 2,800	$ 31,700	$ 6,300
Recording (recovery) of provision for unfunded commitments of credit losses	1,000	$ 1,000
Provision for unfunded commitments	1,000		(1,500)	0	(1,500)
Non-accrual loans	95,747			95,747		$ 59,971
Loans Past Due Over 90 Days Still Accruing	5,356			5,356		4,130
Nonaccrual loans with specific reserve	46,500			46,500		2,500
Collateral-dependent impaired loans	134,100			134,100		94,900
Interest recognized on impaired loans	1,300		347	3,700	1,000
Amount of loan assessed for impairment on a quarterly basis				2,000
Revolver loans converted to term loans				$ 45,300	$ 32,100
Number of revolving loans convert to term loans \| loan				180	182
Premodification balance				$ 1,200	$ 19,400
Number of loans \| loan				8	18
Ending balance				$ 1,100
Loans, ending balance			20,800		$ 20,800
Hurricane
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for credit losses on loans				16,700
Borrowers Experiencing Financial Difficulty
Financing Receivable Allowance For Credit Losses [Line Items]
Premodification balance						$ 1,400
Number of loans \| loan						11
Loans, ending balance	1,300			1,300
Loan balance, nonaccrual	1,100			1,100
Loans Past Due 30-59 Days \| Borrowers Experiencing Financial Difficulty
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, ending balance	92			92
Past Due \| Borrowers Experiencing Financial Difficulty
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, ending balance	193			$ 193
Construction / Land Development and Other Commercial Real Estate Loans \| Minimum
Financing Receivable Allowance For Credit Losses [Line Items]
Loans collateralized by first liens on real estate amortized period				15 years
Loans collateralized by first liens on real estate balloon payments due period				1 year
Construction / Land Development and Other Commercial Real Estate Loans \| Maximum
Financing Receivable Allowance For Credit Losses [Line Items]
Loans collateralized by first liens on real estate amortized period				30 years
Loans collateralized by first liens on real estate balloon payments due period				5 years
Percentage of loan value of improved property				85.00%
Percentage of loan value of raw land				65.00%
Percentage of loan value of land to be acquired and developed				75.00%
Residential real estate loans
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for credit losses on loans	8,059		3,233	$ 3,676
Residential real estate loans \| Maximum
Financing Receivable Allowance For Credit Losses [Line Items]
Loan-to-value ratio				90.00%
Commercial and Industrial Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for credit losses on loans	(8,434)		$ 2,059	$ (28,210)
Non-accrual loans	8,511			8,511		$ 9,982
Loans Past Due Over 90 Days Still Accruing	$ 2,405			$ 2,405		$ 1,535
Commercial and Industrial Loans \| Minimum
Financing Receivable Allowance For Credit Losses [Line Items]
Commercial loans terms				1 year
Inventory financing percentage	50.00%			50.00%
Commercial and Industrial Loans \| Minimum \| Loans Past Due 30-59 Days
Financing Receivable Allowance For Credit Losses [Line Items]
Accounts receivable financed percentage	50.00%			50.00%
Commercial and Industrial Loans \| Maximum
Financing Receivable Allowance For Credit Losses [Line Items]
Commercial loans terms				7 years
Inventory financing percentage	80.00%			80.00%
Commercial and Industrial Loans \| Maximum \| Loans Past Due 30-59 Days
Financing Receivable Allowance For Credit Losses [Line Items]
Accounts receivable financed percentage	80.00%			80.00%