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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

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