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Fair Value - Summary of Additional Information about Unobservable Inputs Used in Fair Value Measurement (Detail) - Fair Value, Measurements, Nonrecurring [Member] - Level 3 [Member]
$ in Thousands
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Impaired Real Estate Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 22,539 $ 9,173
Alternative Investment Valuation Technique Extensible List eqbk:SalesComparisonApproachMember eqbk:SalesComparisonApproachMember
Fair value unobservable input additional stress percentage 10.00%  
Impaired Real Estate Loans [Member] | Minimum [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 0.09 0.03
Impaired Real Estate Loans [Member] | Maximum [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 0.33 0.12
Impaired Real Estate Loans [Member] | Weighted Average [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 0.21 0.08
Impaired Other Real Estate Owned [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value $ 5,633 $ 1,310
Alternative Investment Valuation Technique Extensible List eqbk:SalesComparisonApproachMember eqbk:SalesComparisonApproachMember
Fair value unobservable input additional stress percentage 13.29%  
Impaired Other Real Estate Owned [Member] | Minimum [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 0.10 0.10
Impaired Other Real Estate Owned [Member] | Maximum [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 0.55 0.55
Impaired Other Real Estate Owned [Member] | Weighted Average [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range 0.33 0.32
Impaired Other Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair Value   $ 14,261
Alternative Investment Valuation Technique Extensible List   eqbk:MultipleOfEarningsMember