Parent Company Only Condensed Financial Information - Condensed Statemetns of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 14,143	$ 8,734	$ 3,644
Adjustments:
Stock compensation expense	1,095	1,503	554
Change in other assets	(4,974)	(3,351)	(2,309)
Net cash provided by (used in) operating activities	14,895	9,428	3,979
Cash flows from investing activities
Purchase of equity investment without readily determinable fair value		(2,410)
Net cash used in investing activities	(95,897)	(142,059)	(108,791)
Cash flows from financing activities:
Exercise of stock options	50	378	942
Proceeds from the issuance of common stock			26,341
Net cash provided by financing activities	112,246	120,116	104,896
Net change in cash and cash equivalents	31,244	(12,515)	84
Cash and cash equivalents at beginning of the period	30,562	43,077	42,993
Cash and cash equivalents at end of the period	61,806	30,562	43,077
Esquire Financial Holdings Inc
Cash flows from operating activities:
Net income	14,143	8,734	3,644
Adjustments:
Stock compensation expense	1,095	1,503	554
Equity in undistributed subsidiary income	(15,420)	(10,278)	(4,139)
Change in other assets	(435)	(563)	(388)
Change in other liabilities	322	(9)	34
Net cash provided by (used in) operating activities	(295)	(613)	(295)
Cash flows from investing activities
Investments in subsidiaries		(11,000)	(12,000)
Net change in loans	1,775	(1,775)
Purchase of equity investment without readily determinable fair value		(2,410)
Net cash used in investing activities	1,775	(15,185)	(12,000)
Cash flows from financing activities:
Exercise of stock options	50	378	942
Proceeds from the issuance of common stock			26,341
Net cash provided by financing activities	50	378	27,283
Net change in cash and cash equivalents	1,530	(15,420)	14,988
Cash and cash equivalents at beginning of the period	4,041	19,461	4,473
Cash and cash equivalents at end of the period	$ 5,571	$ 4,041	$ 19,461