Parent Company Only Condensed Financial Information - Condensed financial information (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 61,806	$ 30,562
Loans	565,369	468,101
Other assets	20,612	12,963
Total assets	798,008	663,899
LIABILITIES
Total liabilities	686,946	571,125
STOCKHOLDERS' EQUITY
Common stock	77	75
Additional paid-in-capital	89,682	88,539
Retained earnings	20,917	6,774
Other comprehensive income (loss)	386	(2,614)	$ (1,390)	$ (884)
Total stockholders' equity	111,062	92,774	$ 83,383	$ 52,186
Total liabilities and stockholders' equity	798,008	663,899
Esquire Financial Holdings Inc
ASSETS
Cash and cash equivalents	5,571	4,041
Investment in banking subsidiary	101,414	82,994
Loans		1,775
Investment in equity security without readily determinable fair value	2,410	2,410
Other assets	2,046	1,611
Total assets	111,441	92,831
LIABILITIES
Other liabilities	379	57
Total liabilities	379	57
STOCKHOLDERS' EQUITY
Common stock	77	75
Additional paid-in-capital	89,682	88,539
Retained earnings	20,917	6,774
Other comprehensive income (loss)	386	(2,614)
Total stockholders' equity	111,062	92,774
Total liabilities and stockholders' equity	$ 111,441	$ 92,831