Parent Company Only Condensed Financial Information - CONDENSED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands	12 Months Ended			24 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2016
Condensed Income Statements, Captions [Line Items]
Interest income	$ 28,951	$ 20,394	$ 16,168
Other expense	1,212	538	511
Income tax benefit	(3,190)	(3,390)	(1,766)
Net income	8,734	3,644	2,822	$ 2,822
Total comprehensive income	7,510	3,360		$ 2,372
Esquire Financial Holdings Inc
Condensed Income Statements, Captions [Line Items]
Interest income	156	0	100
Other expense	2,263	883	621
Loss before income tax and undistributed subsidiary income	2,107	883	521
Income tax benefit	563	388	200
Equity in undistributed subsidiary income	10,278	4,139	3,143
Net income	8,734	3,644	2,822
Total comprehensive income	$ 7,510	$ 3,360	$ 2,372