NSTS Bancorp, Inc. Quarterly report [Sections 13 or 15(d)]

Note 3 - Loans and Allowance for Credit Losses - Aging of Bank's Loan Portfolio (Details)

Note 3 - Loans and Allowance for Credit Losses - Aging of Bank's Loan Portfolio (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024	Jan. 01, 2024
Loans	$ 133,627	$ 130,907
Non-Accrual	287	0	$ 200
First Mortgage Loans [Member]
Loans	133,313	130,625
First Mortgage Loans [Member] \| One To Four Family Residential [Member]
Loans	121,837	119,409
Non-Accrual	287	0	200
First Mortgage Loans [Member] \| Multifamily [Member]
Loans	3,304	3,368
Non-Accrual	0	0	0
First Mortgage Loans [Member] \| Commercial Real Estate [Member]
Loans	4,271	4,197
Non-Accrual	0	0	0
First Mortgage Loans [Member] \| Construction Loans [Member]
Loans	3,901	3,651
Non-Accrual	0	0	0
Consumer Portfolio Segment [Member]
Loans	314	282
Non-Accrual	0	0	$ 0
Financial Asset, 31 to 89 Days Past Due [Member]
Loans	455	371
Financial Asset, 31 to 89 Days Past Due [Member] \| First Mortgage Loans [Member] \| One To Four Family Residential [Member]
Loans	455	371
Financial Asset, 31 to 89 Days Past Due [Member] \| First Mortgage Loans [Member] \| Multifamily [Member]
Loans	0	0
Financial Asset, 31 to 89 Days Past Due [Member] \| First Mortgage Loans [Member] \| Commercial Real Estate [Member]
Loans	0	0
Financial Asset, 31 to 89 Days Past Due [Member] \| First Mortgage Loans [Member] \| Construction Loans [Member]
Loans	0	0
Financial Asset, 31 to 89 Days Past Due [Member] \| Consumer Portfolio Segment [Member]
Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| First Mortgage Loans [Member] \| One To Four Family Residential [Member]
Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| First Mortgage Loans [Member] \| Multifamily [Member]
Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| First Mortgage Loans [Member] \| Commercial Real Estate [Member]
Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| First Mortgage Loans [Member] \| Construction Loans [Member]
Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Consumer Portfolio Segment [Member]
Loans	0	0
Financial Asset, Past Due [Member]
Loans	742	371
Financial Asset, Past Due [Member] \| First Mortgage Loans [Member] \| One To Four Family Residential [Member]
Loans	742	371
Financial Asset, Past Due [Member] \| First Mortgage Loans [Member] \| Multifamily [Member]
Loans	0	0
Financial Asset, Past Due [Member] \| First Mortgage Loans [Member] \| Commercial Real Estate [Member]
Loans	0	0
Financial Asset, Past Due [Member] \| First Mortgage Loans [Member] \| Construction Loans [Member]
Loans	0	0
Financial Asset, Past Due [Member] \| Consumer Portfolio Segment [Member]
Loans	0	0
Financial Asset, Not Past Due [Member]
Loans	132,885	130,536
Financial Asset, Not Past Due [Member] \| First Mortgage Loans [Member] \| One To Four Family Residential [Member]
Loans	121,095	119,038
Financial Asset, Not Past Due [Member] \| First Mortgage Loans [Member] \| Multifamily [Member]
Loans	3,304	3,368
Financial Asset, Not Past Due [Member] \| First Mortgage Loans [Member] \| Commercial Real Estate [Member]
Loans	4,271	4,197
Financial Asset, Not Past Due [Member] \| First Mortgage Loans [Member] \| Construction Loans [Member]
Loans	3,901	3,651
Financial Asset, Not Past Due [Member] \| Consumer Portfolio Segment [Member]
Loans	$ 314	$ 282