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Short-term borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Short-term Debt
Ending Balance	$ 50,000	$ 152,150
FHLB advances
Short-term Debt
Ending Balance	50,000	152,150	$ 86,500
Average Balance	83,716	62,941	133,834
Maximum Month-End Balance	$ 179,199	$ 152,150	$ 189,275
Weighted Average Rate for the Year	1.01%	2.61%	2.05%
Weighted Average Rate at End of Year	0.40%	1.84%	2.62%

X

- Definition

The short-term debt weighted average interest rate at the end of the year.

+ References

No definition available.

+ Details

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- Definition

The short-term debt weighted average interest rate during the year.

+ References

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ 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(19)(a))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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-Name Accounting Standards Codification
-Topic 944
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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.

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- Definition

For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

+ References

No definition available.

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- Definition

For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period.

+ References

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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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