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Loans, net and allowance for loan losses - Information Concerning Nonaccrual Loans by Major Loan Classification (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due.
Nonaccrual loans, Total	$ 2,035	$ 2,811
Financing Receivable	(800)
Charge-offs	(787)	(956)	$ (3,479)
Commercial
Financing Receivable, Recorded Investment, Past Due.
Nonaccrual loans, Total	86	185
Charge-offs	(161)	(492)	(2,771)
Commercial and Residential Portfolio Segment
Financing Receivable, Recorded Investment, Past Due.
Financing Receivable, Sale	900
Charge-offs	(100)
Commercial real estate
Financing Receivable, Recorded Investment, Past Due.
Nonaccrual loans, Total	1,155	1,793
Charge-offs	(284)	(252)	(144)
Residential real estate
Financing Receivable, Recorded Investment, Past Due.
Nonaccrual loans, Total	562	694
Charge-offs	(31)	(24)	(247)
Consumer
Financing Receivable, Recorded Investment, Past Due.
Nonaccrual loans, Total	232	139
Charge-offs	$ (311)	$ (188)	$ (317)

X

- Definition

Amount of increase (decrease) in financing receivable on nonaccrual status.

+ References

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- Definition

Amount of writeoff of financing receivable, charged against allowance for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
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Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease.

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Amount of decrease in financing receivable from sale. Excludes net investment in lease.

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-Topic 326
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