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Employee benefit plans - Salaries and Employee Benefits Expense - SERP and Employee Pension Plan (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jun. 22, 2008
Supplemental Executive Retirement Plans ("SERP") |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Maximum annual benefit in excess of federal limits (as a percent) | 6.00% |  |  |
Employee benefit plan liability | $ 180 |  |  |
Employee benefit plan expense | 19 | $ 20 | $ 19 |
Defined benefit plan accrued liabilities | 3,100 | 2,800 |  |
Compensation expense | $ 400 | 400 | $ 400 |
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Retirement age period for fixed benefits payable | 65 years |  |  |
Benefits accrued under employees' pension plan |  |  |  | $ 0
Increase (decrease) in accumulated benefit obligation | $ 300 | $ (3,900) |  |
Discount rate, Obligation | 4.73% | 4.93% | 2.59% |

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- Definition The retirement age at which the plan provides fixed benefits payable for life. + References No definition available. + Details
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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension plan. Excludes other postretirement benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of increase (decrease) in accumulated benefit obligation from change in existing term of defined benefit plan or initiation of new defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (r) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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