Parent Company Only Condensed Financial Information - Condensed Statements of Income and Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Income Statements, Captions [Line Items]
Interest income	$ 36,659	$ 28,951	$ 20,394
Other expense	2,548	1,212	538
Income tax benefit	4,995	3,190	3,390
Net income	14,143	8,734	3,644
Total comprehensive income	17,143	7,510	3,360
Esquire Financial Holdings Inc
Condensed Income Statements, Captions [Line Items]
Interest income	95	156	0
Other expense	1,822	2,263	883
Loss before income tax and undistributed subsidiary income	1,727	2,107	883
Income tax benefit	450	563	388
Equity in undistributed subsidiary income	15,420	10,278	4,139
Net income	14,143	8,734	3,644
Total comprehensive income	$ 17,143	$ 7,510	$ 3,360