Fair Value Measurements - Financial assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Assets
Securities available-for-sale, at fair value	$ 156,864	$ 156,475
Carrying Amount
Assets
Securities available-for-sale, at fair value	156,864	156,475
Cash flow hedge \| Carrying Amount
Assets
Derivative assets	696	5,371
Interest rate swaps \| Carrying Amount
Assets
Derivative assets	1,750	3,536
Financial liabilities:
Derivative liabilities - interest rate swaps	1,750	3,536
Securities of U.S. government and federal agencies
Assets
Securities available-for-sale, at fair value	8,942	8,561
Corporate bonds
Assets
Securities available-for-sale, at fair value	16,524	17,117
SBA pass-through securities
Assets
Securities available-for-sale, at fair value	42	45
Mortgage-backed securities
Assets
Securities available-for-sale, at fair value	127,368	127,676
Collateralized mortgage obligations
Assets
Securities available-for-sale, at fair value	3,652	2,727
US States and Political Subdivisions Debt Securities
Assets
Securities available-for-sale, at fair value	336	349
Level 1
Assets
Securities available-for-sale, at fair value	0	0
Level 1 \| Cash flow hedge
Assets
Derivative assets	0	0
Level 1 \| Interest rate swaps
Assets
Derivative assets	0	0
Financial liabilities:
Derivative liabilities - interest rate swaps	0	0
Level 2
Assets
Securities available-for-sale, at fair value	156,864	156,475
Level 2 \| Cash flow hedge
Assets
Derivative assets	696	5,371
Level 2 \| Interest rate swaps
Assets
Derivative assets	1,750	3,536
Financial liabilities:
Derivative liabilities - interest rate swaps	1,750	3,536
Level 3
Assets
Securities available-for-sale, at fair value	0	0
Level 3 \| Cash flow hedge
Assets
Derivative assets	0	0
Level 3 \| Interest rate swaps
Assets
Derivative assets	0	0
Financial liabilities:
Derivative liabilities - interest rate swaps	0	0
Recurring
Assets
Securities available-for-sale, at fair value	156,864	156,475
Recurring \| Securities of U.S. government and federal agencies
Assets
Securities available-for-sale, at fair value	8,942	8,561
Recurring \| Corporate bonds
Assets
Securities available-for-sale, at fair value	16,524	17,117
Recurring \| SBA pass-through securities
Assets
Securities available-for-sale, at fair value	42	45
Recurring \| Mortgage-backed securities
Assets
Securities available-for-sale, at fair value	127,368	127,676
Recurring \| Collateralized mortgage obligations
Assets
Securities available-for-sale, at fair value	3,652	2,727
Recurring \| US States and Political Subdivisions Debt Securities
Assets
Securities available-for-sale, at fair value	336	349
Recurring \| Level 1
Assets
Securities available-for-sale, at fair value	0	0
Recurring \| Level 1 \| Securities of U.S. government and federal agencies
Assets
Securities available-for-sale, at fair value	0	0
Recurring \| Level 1 \| Corporate bonds
Assets
Securities available-for-sale, at fair value	0	0
Recurring \| Level 1 \| SBA pass-through securities
Assets
Securities available-for-sale, at fair value	0	0
Recurring \| Level 1 \| Mortgage-backed securities
Assets
Securities available-for-sale, at fair value	0	0
Recurring \| Level 1 \| Collateralized mortgage obligations
Assets
Securities available-for-sale, at fair value	0	0
Recurring \| Level 1 \| US States and Political Subdivisions Debt Securities
Assets
Securities available-for-sale, at fair value	0	0
Recurring \| Level 2
Assets
Securities available-for-sale, at fair value	156,864	156,475
Recurring \| Level 2 \| Securities of U.S. government and federal agencies
Assets
Securities available-for-sale, at fair value	8,942	8,561
Recurring \| Level 2 \| Corporate bonds
Assets
Securities available-for-sale, at fair value	16,524	17,117
Recurring \| Level 2 \| SBA pass-through securities
Assets
Securities available-for-sale, at fair value	42	45
Recurring \| Level 2 \| Mortgage-backed securities
Assets
Securities available-for-sale, at fair value	127,368	127,676
Recurring \| Level 2 \| Collateralized mortgage obligations
Assets
Securities available-for-sale, at fair value	3,652	2,727
Recurring \| Level 2 \| US States and Political Subdivisions Debt Securities
Assets
Securities available-for-sale, at fair value	336	349
Recurring \| Level 3
Assets
Securities available-for-sale, at fair value	0	0
Recurring \| Level 3 \| Securities of U.S. government and federal agencies
Assets
Securities available-for-sale, at fair value	0	0
Recurring \| Level 3 \| Corporate bonds
Assets
Securities available-for-sale, at fair value	0	0
Recurring \| Level 3 \| SBA pass-through securities
Assets
Securities available-for-sale, at fair value	0	0
Recurring \| Level 3 \| Mortgage-backed securities
Assets
Securities available-for-sale, at fair value	0	0
Recurring \| Level 3 \| Collateralized mortgage obligations
Assets
Securities available-for-sale, at fair value	0	0
Recurring \| Level 3 \| US States and Political Subdivisions Debt Securities
Assets
Securities available-for-sale, at fair value	$ 0	$ 0

FVCBankcorp, Inc. 10-Q