Loans and allowance for loan losses - Average recorded investment in impaired loans (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2022
Commercial real estate
With no related allowance recorded
Average Recorded Investment	$ 5,725	$ 6,151
Interest Income Recognized	43	91
With an allowance recorded
Average Recorded Investment	261	197
Interest Income Recognized		7
Total
Average Recorded Investment	5,986	6,348
Interest Income Recognized	43	98
Commercial real estate \| Owner occupied
With no related allowance recorded
Average Recorded Investment	4,461	4,694
Interest Income Recognized	35	66
With an allowance recorded
Average Recorded Investment	261	197
Interest Income Recognized		7
Total
Average Recorded Investment	4,722	4,891
Interest Income Recognized	35	73
Commercial real estate \| Non-owner occupied
With no related allowance recorded
Average Recorded Investment	1,264	1,457
Interest Income Recognized	8	25
Total
Average Recorded Investment	1,264	1,457
Interest Income Recognized	8	25
Consumer real estate secured by 1-4 family residential
With no related allowance recorded
Average Recorded Investment	2,473	2,466
Interest Income Recognized	34	57
With an allowance recorded
Average Recorded Investment	240	193
Interest Income Recognized	3	4
Total
Average Recorded Investment	2,713	2,659
Interest Income Recognized	37	61
Consumer real estate secured by 1-4 family residential \| Home equity lines
With no related allowance recorded
Average Recorded Investment	300	300
Interest Income Recognized	15	15
Total
Average Recorded Investment	300	300
Interest Income Recognized	15	15
Consumer real estate secured by 1-4 family residential \| First deed of trust
With no related allowance recorded
Average Recorded Investment	1,800	1,831
Interest Income Recognized	17	37
With an allowance recorded
Average Recorded Investment	142	144
Interest Income Recognized	3	4
Total
Average Recorded Investment	1,942	1,975
Interest Income Recognized	20	41
Consumer real estate secured by 1-4 family residential \| Second deed of trust
With no related allowance recorded
Average Recorded Investment	373	335
Interest Income Recognized	2	5
With an allowance recorded
Average Recorded Investment	98	49
Total
Average Recorded Investment	471	384
Interest Income Recognized	2	5
Commercial and industrial loans
With no related allowance recorded
Average Recorded Investment	8,333	8,779
Interest Income Recognized	77	149
With an allowance recorded
Average Recorded Investment	501	390
Interest Income Recognized	3	11
Total
Average Recorded Investment	8,834	9,169
Interest Income Recognized	80	160
Commercial and industrial loans \| Commercial and industrial loans (except those secured by real estate)
With no related allowance recorded
Average Recorded Investment	135	162
Interest Income Recognized		1
Total
Average Recorded Investment	$ 135	162
Interest Income Recognized		$ 1

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5258-111524

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5258-111524

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-Publisher FASB
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-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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