| Document and Entity Information | Oct. 05, 2020 |
| Document and Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 5, 2020 |
| Entity File Number | 001-38131 |
| Entity Registrant Name | Esquire Financial Holdings, Inc. |
| Entity Incorporation, State or Country Code | MD |
| Entity Tax Identification Number | 27-5107901 |
| Entity Address, Address Line One | 100 Jericho Quadrangle, Suite 100 |
| Entity Address, City or Town | Jericho |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 11753 |
| City Area Code | 516 |
| Local Phone Number | 535-2002 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.01 par value |
| Trading Symbol | ESQ |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | true |
| Entity Central Index Key | 0001531031 |
| Amendment Flag | false |
