Condensed Financial Statements of Parent Company - Condensed Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Income
Total interest and dividend income	$ 55,843	$ 48,075
Operating expenses
Interest on short-term borrowings	0	430
Professional services	3,148	3,163
Other expenses	1,827	1,553
Income tax benefit	5,179	5,319
Net income	20,237	20,949
Parent Company
Income
Other income	51	0
Dividend from Chain Bridge Bank, N.A.	0	1,120
Total interest and dividend income	51	1,120
Operating expenses
Interest on short-term borrowings	0	509
Professional services	1,059	1,851
Management Fee from Chain Bridge Bank, N.A.	886	0
Other expenses	855	613
Total operating expenses	2,800	2,973
Loss before allocated tax benefit and undistributed net income of Chain Bridge Bank, N.A.	(2,749)	(1,853)
Income tax benefit	(577)	(624)
Undistributed net income of Chain Bridge Bank, N.A.	22,409	22,178
Net income	$ 20,237	$ 20,949