XML 46 R36.htm IDEA: XBRL DOCUMENT
v3.25.3

Note 4 - Loans - Loans by Credit Quality Indicators (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Originated current year | $ 16,880,560 |  | $ 16,880,560 |  | $ 44,058,521
Originated prior year | 44,742,840 |  | 44,742,840 |  | 32,442,459
Originated two years prior | 35,149,757 |  | 35,149,757 |  | 109,789,683
Originated three years prior | 109,663,475 |  | 109,663,475 |  | 33,689,261
Originated four years prior | 31,517,031 |  | 31,517,031 |  | 68,992,186
Originated years prior | 210,169,367 |  | 210,169,367 |  | 160,902,523
Revolving | 223,648,905 |  | 223,648,905 |  | 264,462,552
Total loans | 671,771,935 |  | 671,771,935 |  | 714,337,185
Gross charge-offs by vintage | (0) | $ (0) | (0) | $ (0) |
Gross charge-offs by vintage | (0) | (0) | (0) | (0) |
Commercial and Industrial [Member] |  |  |  |  |
Originated current year | 23,978 |  | 23,978 |  | 2,380,140
Originated prior year | 1,966,064 |  | 1,966,064 |  | 196,286
Originated two years prior | 161,069 |  | 161,069 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 311,422
Originated years prior | 166,104 |  | 166,104 |  | 0
Revolving | 1,386,261 |  | 1,386,261 |  | 3,275,899
Total loans | 3,703,476 |  | 3,703,476 |  | 6,163,747
Originated current year, writeoffs |  |  | 0 |  | 0
Originated prior year, writeoffs |  |  | 0 |  | 0
Originated two years prior, writeoffs |  |  | 0 |  | 0
Originated three years prior, writeoffs |  |  | 0 |  | 0
Originated four years prior, writeoffs |  |  | 0 |  | 0
Originated years prior, writeoffs |  |  | 0 |  | 0
Revolving, writeoffs |  |  | 0 |  | 0
Gross charge-offs by vintage | (0) | (0) | (0) | (0) | 0
Gross charge-offs by vintage | (0) | (0) | (0) | (0) | 0
Commercial and Industrial [Member] | Pass [Member] |  |  |  |  |
Originated current year | 23,978 |  | 23,978 |  | 2,380,140
Originated prior year | 1,966,064 |  | 1,966,064 |  | 196,286
Originated two years prior | 161,069 |  | 161,069 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 311,422
Originated years prior | 166,104 |  | 166,104 |  | 0
Revolving | 1,386,261 |  | 1,386,261 |  | 3,275,899
Total loans | 3,703,476 |  | 3,703,476 |  | 6,163,747
Commercial and Industrial [Member] | Special Mention [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 0 |  | 0 |  | 0
Revolving | 0 |  | 0 |  | 0
Total loans | 0 |  | 0 |  | 0
Commercial and Industrial [Member] | Substandard [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 0 |  | 0 |  | 0
Revolving | 0 |  | 0 |  | 0
Total loans | 0 |  | 0 |  | 0
Commercial and Industrial [Member] | Doubtful [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 0 |  | 0 |  | 0
Revolving | 0 |  | 0 |  | 0
Total loans | 0 |  | 0 |  | 0
Consumer Portfolio Segment [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 0 |  | 0 |  | 0
Revolving | 64,336 |  | 64,336 |  | 80,955
Total loans | 64,336 |  | 64,336 |  | 80,955
Originated current year, writeoffs |  |  | 0 |  | 0
Originated prior year, writeoffs |  |  | 0 |  | 0
Originated two years prior, writeoffs |  |  | 0 |  | 0
Originated three years prior, writeoffs |  |  | 0 |  | 0
Originated four years prior, writeoffs |  |  | 0 |  | 0
Originated years prior, writeoffs |  |  | 0 |  | 0
Revolving, writeoffs |  |  | 0 |  | 0
Gross charge-offs by vintage | (0) | (0) | (0) | (0) | 0
Gross charge-offs by vintage | (0) | (0) | (0) | (0) | 0
Consumer Portfolio Segment [Member] | Pass [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 0 |  | 0 |  | 0
Revolving | 64,336 |  | 64,336 |  | 80,955
Total loans | 64,336 |  | 64,336 |  | 80,955
Consumer Portfolio Segment [Member] | Special Mention [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 0 |  | 0 |  | 0
Revolving | 0 |  | 0 |  | 0
Total loans | 0 |  | 0 |  | 0
Consumer Portfolio Segment [Member] | Substandard [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 0 |  | 0 |  | 0
Revolving | 0 |  | 0 |  | 0
Total loans | 0 |  | 0 |  | 0
Consumer Portfolio Segment [Member] | Doubtful [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 0 |  | 0 |  | 0
Revolving | 0 |  | 0 |  | 0
Total loans | 0 |  | 0 |  | 0
Real Estate Loan [Member] | Residential Portfolio Segment [Member] |  |  |  |  |
Originated current year | 6,522,488 |  | 6,522,488 |  | 26,742,846
Originated prior year | 26,799,710 |  | 26,799,710 |  | 20,620,971
Originated two years prior | 19,609,339 |  | 19,609,339 |  | 102,163,479
Originated three years prior | 99,318,676 |  | 99,318,676 |  | 31,658,834
Originated four years prior | 29,797,378 |  | 29,797,378 |  | 26,147,651
Originated years prior | 128,608,875 |  | 128,608,875 |  | 119,091,517
Revolving | 138,939,828 |  | 138,939,828 |  | 146,322,244
Total loans | 449,596,294 |  | 449,596,294 |  | 472,747,542
Originated current year, writeoffs |  |  | 0 |  | 0
Originated prior year, writeoffs |  |  | 0 |  | 0
Originated two years prior, writeoffs |  |  | 0 |  | 0
Originated three years prior, writeoffs |  |  | 0 |  | 0
Originated four years prior, writeoffs |  |  | 0 |  | 0
Originated years prior, writeoffs |  |  | 0 |  | 0
Revolving, writeoffs |  |  | 0 |  | 0
Gross charge-offs by vintage | (0) | (0) | (0) | (0) | 0
Gross charge-offs by vintage | (0) | (0) | (0) | (0) | 0
Real Estate Loan [Member] | Residential Portfolio Segment [Member] | Pass [Member] |  |  |  |  |
Originated current year | 6,522,488 |  | 6,522,488 |  | 26,742,846
Originated prior year | 26,799,710 |  | 26,799,710 |  | 20,620,971
Originated two years prior | 19,609,339 |  | 19,609,339 |  | 102,163,479
Originated three years prior | 99,318,676 |  | 99,318,676 |  | 31,658,834
Originated four years prior | 29,797,378 |  | 29,797,378 |  | 25,961,474
Originated years prior | 127,658,092 |  | 127,658,092 |  | 118,351,367
Revolving | 138,007,695 |  | 138,007,695 |  | 145,384,614
Total loans | 447,713,378 |  | 447,713,378 |  | 470,883,585
Real Estate Loan [Member] | Residential Portfolio Segment [Member] | Special Mention [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 186,177
Originated years prior | 808,122 |  | 808,122 |  | 593,420
Revolving | 596,186 |  | 596,186 |  | 598,461
Total loans | 1,404,308 |  | 1,404,308 |  | 1,378,058
Real Estate Loan [Member] | Residential Portfolio Segment [Member] | Substandard [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 142,661 |  | 142,661 |  | 146,730
Revolving | 335,947 |  | 335,947 |  | 339,169
Total loans | 478,608 |  | 478,608 |  | 485,899
Real Estate Loan [Member] | Residential Portfolio Segment [Member] | Doubtful [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 0 |  | 0 |  | 0
Revolving | 0 |  | 0 |  | 0
Total loans | 0 |  | 0 |  | 0
Real Estate Loan [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Originated current year | 8,598,378 |  | 8,598,378 |  | 14,935,535
Originated prior year | 15,977,066 |  | 15,977,066 |  | 11,625,202
Originated two years prior | 15,379,349 |  | 15,379,349 |  | 5,363,747
Originated three years prior | 5,259,733 |  | 5,259,733 |  | 2,030,427
Originated four years prior | 1,719,653 |  | 1,719,653 |  | 42,533,113
Originated years prior | 75,503,736 |  | 75,503,736 |  | 39,901,866
Revolving | 373,886 |  | 373,886 |  | 1,618,976
Total loans | 122,811,801 |  | 122,811,801 |  | 118,008,866
Originated current year, writeoffs |  |  | 0 |  | 0
Originated prior year, writeoffs |  |  | 0 |  | 0
Originated two years prior, writeoffs |  |  | 0 |  | 0
Originated three years prior, writeoffs |  |  | 0 |  | 0
Originated four years prior, writeoffs |  |  | 0 |  | 0
Originated years prior, writeoffs |  |  | 0 |  | 0
Revolving, writeoffs |  |  | 0 |  | 0
Gross charge-offs by vintage | (0) | (0) | (0) | (0) | 0
Gross charge-offs by vintage | (0) | (0) | (0) | (0) | 0
Real Estate Loan [Member] | Commercial Real Estate Portfolio Segment [Member] | Pass [Member] |  |  |  |  |
Originated current year | 8,598,378 |  | 8,598,378 |  | 14,935,535
Originated prior year | 15,977,066 |  | 15,977,066 |  | 11,625,202
Originated two years prior | 15,379,349 |  | 15,379,349 |  | 5,363,747
Originated three years prior | 5,259,733 |  | 5,259,733 |  | 2,030,427
Originated four years prior | 1,719,653 |  | 1,719,653 |  | 42,533,113
Originated years prior | 75,503,736 |  | 75,503,736 |  | 38,696,841
Revolving | 373,886 |  | 373,886 |  | 1,618,976
Total loans | 122,811,801 |  | 122,811,801 |  | 116,803,841
Real Estate Loan [Member] | Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 0 |  | 0 |  | 754,633
Revolving | 0 |  | 0 |  | 0
Total loans | 0 |  | 0 |  | 754,633
Real Estate Loan [Member] | Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 0 |  | 0 |  | 450,392
Revolving | 0 |  | 0 |  | 0
Total loans | 0 |  | 0 |  | 450,392
Real Estate Loan [Member] | Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 0 |  | 0 |  | 0
Revolving | 0 |  | 0 |  | 0
Total loans | 0 |  | 0 |  | 0
Real Estate Loan [Member] | Multi-Family Real Estate [Member] |  |  |  |  |
Originated current year | 1,735,716 |  | 1,735,716 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 2,262,457
Originated three years prior | 5,085,066 |  | 5,085,066 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 5,890,652 |  | 5,890,652 |  | 1,909,140
Revolving | 57,652,735 |  | 57,652,735 |  | 69,980,821
Total loans | 70,364,169 |  | 70,364,169 |  | 74,152,418
Originated current year, writeoffs |  |  | 0 |  | 0
Originated prior year, writeoffs |  |  | 0 |  | 0
Originated two years prior, writeoffs |  |  | 0 |  | 0
Originated three years prior, writeoffs |  |  | 0 |  | 0
Originated four years prior, writeoffs |  |  | 0 |  | 0
Originated years prior, writeoffs |  |  | 0 |  | 0
Revolving, writeoffs |  |  | 0 |  | 0
Gross charge-offs by vintage | (0) | (0) | (0) | (0) | 0
Gross charge-offs by vintage | (0) | (0) | (0) | (0) | 0
Real Estate Loan [Member] | Multi-Family Real Estate [Member] | Pass [Member] |  |  |  |  |
Originated current year | 1,735,716 |  | 1,735,716 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 2,262,457
Originated three years prior | 5,085,066 |  | 5,085,066 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 5,890,652 |  | 5,890,652 |  | 1,909,140
Revolving | 57,652,735 |  | 57,652,735 |  | 69,980,821
Total loans | 70,364,169 |  | 70,364,169 |  | 74,152,418
Real Estate Loan [Member] | Multi-Family Real Estate [Member] | Special Mention [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 0 |  | 0 |  | 0
Revolving | 0 |  | 0 |  | 0
Total loans | 0 |  | 0 |  | 0
Real Estate Loan [Member] | Multi-Family Real Estate [Member] | Substandard [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 0 |  | 0 |  | 0
Revolving | 0 |  | 0 |  | 0
Total loans | 0 |  | 0 |  | 0
Real Estate Loan [Member] | Multi-Family Real Estate [Member] | Doubtful [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 0 |  | 0 |  | 0
Revolving | 0 |  | 0 |  | 0
Total loans | 0 |  | 0 |  | 0
Real Estate Loan [Member] | Construction Loans [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 0 |  | 0 |  | 0
Revolving | 25,231,859 |  | 25,231,859 |  | 43,183,657
Total loans | 25,231,859 |  | 25,231,859 |  | 43,183,657
Originated current year, writeoffs |  |  | 0 |  | 0
Originated prior year, writeoffs |  |  | 0 |  | 0
Originated two years prior, writeoffs |  |  | 0 |  | 0
Originated three years prior, writeoffs |  |  | 0 |  | 0
Originated four years prior, writeoffs |  |  | 0 |  | 0
Originated years prior, writeoffs |  |  | 0 |  | 0
Revolving, writeoffs |  |  | 0 |  | 0
Gross charge-offs by vintage | (0) | (0) | (0) | (0) | 0
Gross charge-offs by vintage | (0) | $ (0) | (0) | $ (0) | 0
Real Estate Loan [Member] | Construction Loans [Member] | Pass [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 0 |  | 0 |  | 0
Revolving | 14,338,146 |  | 14,338,146 |  | 32,289,944
Total loans | 14,338,146 |  | 14,338,146 |  | 32,289,944
Real Estate Loan [Member] | Construction Loans [Member] | Special Mention [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 0 |  | 0 |  | 0
Revolving | 0 |  | 0 |  | 0
Total loans | 0 |  | 0 |  | 0
Real Estate Loan [Member] | Construction Loans [Member] | Substandard [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 0 |  | 0 |  | 0
Revolving | 10,893,713 |  | 10,893,713 |  | 10,893,713
Total loans | 10,893,713 |  | 10,893,713 |  | 10,893,713
Real Estate Loan [Member] | Construction Loans [Member] | Doubtful [Member] |  |  |  |  |
Originated current year | 0 |  | 0 |  | 0
Originated prior year | 0 |  | 0 |  | 0
Originated two years prior | 0 |  | 0 |  | 0
Originated three years prior | 0 |  | 0 |  | 0
Originated four years prior | 0 |  | 0 |  | 0
Originated years prior | 0 |  | 0 |  | 0
Revolving | 0 |  | 0 |  | 0
Total loans | 0 |  | 0 |  | 0
Real Estate Loan [Member] | Commercial and Industrial [Member] |  |  |  |  |
Total loans | $ 3,703,476 |  | $ 3,703,476 |  | $ 6,163,747

X
- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated more than five years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable that can be withdrawn, repaid, and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolving
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable that can be withdrawn, repaid, and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated four years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated three years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated in current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated in current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated two years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated two years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated in fiscal year before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=bsbk_CommercialAndIndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=bsbk_MultifamilyRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |