Loans and allowance for credit losses - Average recorded investment in impaired loans (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2023
With an allowance recorded
Average Recorded Investment		$ 193
Total
Average Recorded Investment		4,481
Average Recorded Investment, after ASU 2016-13	$ 2,075
Interest Income Recognized		134
Interest Income Recognized, after ASU 2016-13	97
Commercial real estate
With no related allowance recorded
Average Recorded Investment		2,854
Average Recorded Investment, after ASU 2016-13	1,475
Interest Income Recognized		123
Interest Income Recognized, after ASU 2016-13	92
With an allowance recorded
Average Recorded Investment		127
Total
Average Recorded Investment		2,981
Average Recorded Investment, after ASU 2016-13	1,475
Interest Income Recognized		123
Interest Income Recognized, after ASU 2016-13	92
Commercial real estate \| Owner occupied
With no related allowance recorded
Average Recorded Investment		2,854
Average Recorded Investment, after ASU 2016-13	1,475
Interest Income Recognized		123
Interest Income Recognized, after ASU 2016-13	92
With an allowance recorded
Average Recorded Investment		127
Total
Average Recorded Investment		2,981
Average Recorded Investment, after ASU 2016-13	1,475
Interest Income Recognized		123
Interest Income Recognized, after ASU 2016-13	92
Consumer real estate secured by 1-4 family residential
With no related allowance recorded
Average Recorded Investment		1,382
Average Recorded Investment, after ASU 2016-13	548
Interest Income Recognized		6
Interest Income Recognized, after ASU 2016-13	1
With an allowance recorded
Average Recorded Investment		50
Total
Average Recorded Investment		1,432
Average Recorded Investment, after ASU 2016-13	548
Interest Income Recognized		6
Interest Income Recognized, after ASU 2016-13	1
Consumer real estate secured by 1-4 family residential \| Home equity lines
With no related allowance recorded
Average Recorded Investment		225
Average Recorded Investment, after ASU 2016-13	150
Total
Average Recorded Investment		225
Average Recorded Investment, after ASU 2016-13	150
Consumer real estate secured by 1-4 family residential \| First deed of trust
With no related allowance recorded
Average Recorded Investment		987
Average Recorded Investment, after ASU 2016-13	178
Interest Income Recognized		4
With an allowance recorded
Average Recorded Investment		50
Total
Average Recorded Investment		1,037
Average Recorded Investment, after ASU 2016-13	178
Interest Income Recognized		4
Consumer real estate secured by 1-4 family residential \| Second deed of trust
With no related allowance recorded
Average Recorded Investment		170
Average Recorded Investment, after ASU 2016-13	220
Interest Income Recognized		2
Interest Income Recognized, after ASU 2016-13	1
Total
Average Recorded Investment		170
Average Recorded Investment, after ASU 2016-13	220
Interest Income Recognized		2
Interest Income Recognized, after ASU 2016-13	1
Commercial and industrial loans
With no related allowance recorded
Average Recorded Investment		4,288
Average Recorded Investment, after ASU 2016-13	2,075
Interest Income Recognized		134
Interest Income Recognized, after ASU 2016-13	97
Commercial and industrial loans \| Commercial and industrial loans (except those secured by real estate)
With no related allowance recorded
Average Recorded Investment		52
Average Recorded Investment, after ASU 2016-13	52
Interest Income Recognized		5
Interest Income Recognized, after ASU 2016-13	4
Total
Average Recorded Investment		52
Average Recorded Investment, after ASU 2016-13	52
Interest Income Recognized		5
Interest Income Recognized, after ASU 2016-13	$ 4
Consumer and other
With an allowance recorded
Average Recorded Investment		16
Total
Average Recorded Investment		$ 16

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-15

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-17

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-15

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