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Long-term debt - Long-term debt advances (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument |  |
Long-term debt | $ 14,769 | $ 32,733
Long-term 1.74% fixed rate debt due June 2020 |  |
Debt Instrument |  |
Long-term debt |  | 5,000
Fixed interest rate (as a percent) | 1.74% |
Long-term 2.22% fixed rate debt due June 2020 |  |
Debt Instrument |  |
Long-term debt |  | 6,000
Fixed interest rate (as a percent) | 2.22% |
Long-term 1.84% fixed rate debt due December 2020 |  |
Debt Instrument |  |
Long-term debt |  | 5,000
Fixed interest rate (as a percent) | 1.84% |
Long-term 1.99% fixed rate debt due June 2021 |  |
Debt Instrument |  |
Long-term debt | $ 10,000 | 10,000
Fixed interest rate (as a percent) | 1.99% |
Long-term 4.69% fixed rate debt due March 2023 |  |
Debt Instrument |  |
Long-term debt | $ 4,769 | $ 6,733
Fixed interest rate (as a percent) | 4.69% |

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- Definition Including both current and noncurrent portions, Federal Home Loan Bank borrowings and Federal Reserve Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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