Condensed Financial Statements of Unity Bancorp, Inc. (Parent Company Only) - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
ASSETS
Cash and cash equivalents	$ 180,438	$ 194,776
Debt securities available-for-sale	93,884	91,765
Equity securities with readily determinable fair values	9,850	7,802
Premises and equipment, net	18,778	19,567
Total assets	2,654,017	2,578,507
LIABILITIES AND SHAREHOLDERS' EQUITY
Subordinated debentures	10,310	10,310
Shareholders' equity	295,583	261,430
Total liabilities and shareholders' equity	2,654,017	2,578,507
Parent Company [Member] | Reportable Legal Entities [Member]
ASSETS
Cash and cash equivalents	350	1,410
Debt securities available-for-sale		1,478
Equity securities with readily determinable fair values	3,732	3,559
Investment in subsidiaries	297,853	260,879
Premises and equipment, net	3,506	3,480
Other assets	482	1,303
Total assets	305,923	272,109
LIABILITIES AND SHAREHOLDERS' EQUITY
Other liabilities	30	369
Subordinated debentures	10,310	10,310
Shareholders' equity	295,583	261,430
Total liabilities and shareholders' equity	$ 305,923	$ 272,109