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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | 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 | $ 161 |  |  |
Employee benefit plan expense | 20 | $ 19 | $ 9 |
Defined benefit plan accrued liabilities | 2,800 | 2,600 |  |
Salaries and employee benefits expense | $ 400 | 400 | $ 500 |
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 | $ (3,900) | $ (600) |  |
Discount rate, Obligation | 4.93% | 2.59% | 2.25% |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=123453770&loc=d3e1703-114919 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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