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Loans and allowance for loan losses - Changes in the allowance for loan losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | $ 792 | $ 616 | $ 870 | $ 388 |
Charge-offs |  |  | (99) |  |
Recoveries | 3 | 3 | 7 | 11 |
Net recoveries (charge-offs) | 3 | 3 | (92) | 11 |
Provision for loan losses | (12) | 90 | 5 | 310 |
Ending balance | 783 | 709 | 783 | 709 |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |
Collectively evaluated, Allowance for loan losses | 659 |  | 659 |  | $ 720
Collectively evaluated, Recorded investment in loans | 94,203 |  | 94,203 |  | 96,137
Individually evaluated, Allowance for loan losses | 124 |  | 124 |  | 150
Individually evaluated, Recorded investment in loans | 1,979 |  | 1,979 |  | 2,522
Total, Allowance for loan losses | 783 | 709 | 783 | 709 | 870
Total, Recorded investment in loans | 96,182 |  | 96,182 |  | 98,659
First mortgage loans |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |
Total, Recorded investment in loans | 95,858 |  | 95,858 |  | 98,274
First mortgage loans | 1-4 family residential |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 695 | 538 | 798 | 361 |
Recoveries | 3 | 3 | 7 | 11 |
Net recoveries (charge-offs) | 3 | 3 | 7 | 11 |
Provision for loan losses | 1 | 18 | (126) | 187 |
Ending balance | 679 | 559 | 679 | 559 |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |
Collectively evaluated, Allowance for loan losses | 555 |  | 555 |  | 648
Collectively evaluated, Recorded investment in loans | 85,205 |  | 85,205 |  | 84,774
Individually evaluated, Allowance for loan losses | 124 |  | 124 |  | 150
Individually evaluated, Recorded investment in loans | 1,979 |  | 1,979 |  | 2,423
Total, Allowance for loan losses | 679 | 559 | 679 | 559 | 798
Total, Recorded investment in loans | 87,184 |  | 87,184 |  | 87,197
First mortgage loans | Multi-family |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 52 | 24 | 29 | 10 |
Provision for loan losses | (13) |  | 10 | 14 |
Ending balance | 39 | 24 | 39 | 24 |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |
Collectively evaluated, Allowance for loan losses | 39 |  | 39 |  | 29
Collectively evaluated, Recorded investment in loans | 4,221 |  | 4,221 |  | 5,737
Total, Allowance for loan losses | 39 | 24 | 39 | 24 | 29
Total, Recorded investment in loans | 4,221 |  | 4,221 |  | 5,737
First mortgage loans | Commercial |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 25 | 13 | 38 | 9 |
Provision for loan losses |  | (1) | (13) | 3 |
Ending balance | 25 | 12 | 25 | 12 |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |
Collectively evaluated, Allowance for loan losses | 25 |  | 25 |  | 38
Collectively evaluated, Recorded investment in loans | 4,453 |  | 4,453 |  | 5,340
Total, Allowance for loan losses | 25 | 12 | 25 | 12 | 38
Total, Recorded investment in loans | 4,453 |  | 4,453 |  | 5,340
Consumer loans |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 10 | 1 | 5 | 8 |
Charge-offs |  |  | (99) |  |
Net recoveries (charge-offs) |  |  | (99) |  |
Provision for loan losses |  |  | 104 | (7) |
Ending balance | 10 | 1 | 10 | 1 |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |
Collectively evaluated, Allowance for loan losses | 10 |  | 10 |  | 5
Collectively evaluated, Recorded investment in loans | 324 |  | 324 |  | 286
Individually evaluated, Recorded investment in loans |  |  |  |  | 99
Total, Allowance for loan losses | 10 | 1 | 10 | 1 | 5
Total, Recorded investment in loans | 324 |  | 324 |  | $ 385
Unallocated |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance |  | 40 |  |  |
Provision for loan losses |  | 73 | 30 | 113 |
Ending balance | 30 | 113 | 30 | 113 |
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |  |  |
Collectively evaluated, Allowance for loan losses | 30 |  | 30 |  |
Individually evaluated, Allowance for loan losses | 30 |  | 30 |  |
Total, Allowance for loan losses | $ 30 | $ 113 | $ 30 | $ 113 |

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=122038336&loc=d3e74567-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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