Fair Value Accounting (Details) - Schedule of assets and liabilities measured at fair value on a recurring basis - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Assets
Corporate bonds	$ 1,959	$ 1,927
US treasuries	944	908
US government agencies	15,165	15,795
State and political subdivisions	19,901	19,322
Asset-backed securities	33,774	36,538
Mortgage-backed securities	59,297	57,637
Mortgage loans held for sale	6,906	4,565
Mortgage loan interest rate lock commitments	366	188
Derivative asset		3,698
MBS forward sales commitments		40
Total assets measured at fair value on a recurring basis	138,312	140,618
Liabilities
MBS forward sales commitments	8
Derivative liability	1,664
Total liabilities measured at fair value on a recurring basis	1,672
Level 1 [Member]
Assets
Corporate bonds
US treasuries
US government agencies
State and political subdivisions
Asset-backed securities
Mortgage-backed securities
Mortgage loans held for sale
Mortgage loan interest rate lock commitments
Derivative asset
MBS forward sales commitments
Total assets measured at fair value on a recurring basis
Liabilities
MBS forward sales commitments
Derivative liability
Total liabilities measured at fair value on a recurring basis
Level 2 [Member]
Assets
Corporate bonds	1,959	1,927
US treasuries	944	908
US government agencies	15,165	15,795
State and political subdivisions	19,901	19,322
Asset-backed securities	33,774	36,538
Mortgage-backed securities	59,297	57,637
Mortgage loans held for sale	6,906	4,565
Mortgage loan interest rate lock commitments	366	188
Derivative asset		3,698
MBS forward sales commitments		40
Total assets measured at fair value on a recurring basis	138,312	140,618
Liabilities
MBS forward sales commitments	8
Derivative liability	1,664
Total liabilities measured at fair value on a recurring basis	1,672
Level 3 [Member]
Assets
Corporate bonds
US treasuries
US government agencies
State and political subdivisions
Asset-backed securities
Mortgage-backed securities
Mortgage loans held for sale
Mortgage loan interest rate lock commitments
Derivative asset
MBS forward sales commitments
Total assets measured at fair value on a recurring basis
Liabilities
MBS forward sales commitments
Derivative liability
Total liabilities measured at fair value on a recurring basis

SOUTHERN FIRST BANCSHARES INC 10-Q