Loans and Allowance for Credit Losses - Schedule of Troubled Debt Restructurings by Accrual Status (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2022	Dec. 31, 2021
Financing Receivable Impaired [Line Items]
Trouble debt restructurings, Nonaccrual	$ 10,503	$ 10,799
Trouble debt restructurings, Related allowance for credit losses, Nonaccrual	1,588
Trouble debt restructurings, Accrual	7,689
Trouble debt restructurings, Related allowance for credit losses, Accrual	758
Total TDR Loan Balance	18,192
Trouble debt restructurings, Total related allowance for credit losses	2,346	2,378
Commercial Real Estate [Member]
Financing Receivable Impaired [Line Items]
Trouble debt restructurings, Nonaccrual	4,045	5,784
Trouble debt restructurings, Related allowance for credit losses, Nonaccrual	688
Trouble debt restructurings, Accrual	4,226
Trouble debt restructurings, Related allowance for credit losses, Accrual	251
Total TDR Loan Balance	8,271
Trouble debt restructurings, Total related allowance for credit losses	939	1,370
Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
Trouble debt restructurings, Nonaccrual	2,321	54
Trouble debt restructurings, Related allowance for credit losses, Nonaccrual	109
Trouble debt restructurings, Accrual	1,813
Trouble debt restructurings, Related allowance for credit losses, Accrual	223
Total TDR Loan Balance	4,134
Trouble debt restructurings, Total related allowance for credit losses	332	27
Residential Real Estate [Member]
Financing Receivable Impaired [Line Items]
Trouble debt restructurings, Nonaccrual		1,547
Trouble debt restructurings, Total related allowance for credit losses		13
Agricultural Real Estate [Member]
Financing Receivable Impaired [Line Items]
Trouble debt restructurings, Nonaccrual	1,181	2,122
Trouble debt restructurings, Related allowance for credit losses, Nonaccrual	602
Trouble debt restructurings, Accrual	1,650
Trouble debt restructurings, Related allowance for credit losses, Accrual	284
Total TDR Loan Balance	2,831
Trouble debt restructurings, Total related allowance for credit losses	886	488
Agricultural [Member]
Financing Receivable Impaired [Line Items]
Trouble debt restructurings, Nonaccrual	2,956	1,292
Trouble debt restructurings, Related allowance for credit losses, Nonaccrual	189
Total TDR Loan Balance	2,956
Trouble debt restructurings, Total related allowance for credit losses	$ 189	$ 480

Financing receivable modifications recorded investment accrual.

No definition available.

Name:	eqbk_FinancingReceivableModificationsRecordedInvestmentAccrual
Namespace Prefix:	eqbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

Financing receivable modifications recorded investment nonaccrual.

+ References

No definition available.

+ Details

Name:	eqbk_FinancingReceivableModificationsRecordedInvestmentNonaccrual
Namespace Prefix:	eqbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

Financing receivable modifications recorded investment nonaccrual and accrual.

+ References

No definition available.

+ Details

Name:	eqbk_FinancingReceivableModificationsRecordedInvestmentNonaccrualAndAccrual
Namespace Prefix:	eqbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

Financing receivable modifications recorded investment related allowance for loan losses.

+ References

No definition available.

+ Details

Name:	eqbk_FinancingReceivableModificationsRecordedInvestmentRelatedAllowanceForLoanLosses
Namespace Prefix:	eqbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Financing receivable modifications recorded investment related allowance for loan losses accrual.

+ References

No definition available.

+ Details

Name:	eqbk_FinancingReceivableModificationsRecordedInvestmentRelatedAllowanceForLoanLossesAccrual
Namespace Prefix:	eqbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Financing receivable modifications recorded investment related allowance for loan losses nonaccrual.

+ References

No definition available.

+ Details

Name:	eqbk_FinancingReceivableModificationsRecordedInvestmentRelatedAllowanceForLoanLossesNonaccrual
Namespace Prefix:	eqbk_
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

No definition available.

+ Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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