Loans and allowance for loan losses - Average recorded investment in impaired loans (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2022
Commercial real estate
With no related allowance recorded
Average Recorded Investment	$ 5,391	$ 5,594
Interest Income Recognized	38	129
With an allowance recorded
Average Recorded Investment	259	261
Interest Income Recognized	4	11
Total
Average Recorded Investment	5,650	5,855
Interest Income Recognized	42	140
Commercial real estate \| Owner occupied
With no related allowance recorded
Average Recorded Investment	4,352	4,450
Interest Income Recognized	34	100
With an allowance recorded
Average Recorded Investment	259	261
Interest Income Recognized	4	11
Total
Average Recorded Investment	4,611	4,711
Interest Income Recognized	38	111
Commercial real estate \| Non-owner occupied
With no related allowance recorded
Average Recorded Investment	1,039	1,144
Interest Income Recognized	4	29
Total
Average Recorded Investment	1,039	1,144
Interest Income Recognized	4	29
Consumer real estate secured by 1-4 family residential
With no related allowance recorded
Average Recorded Investment	2,253	2,358
Interest Income Recognized	32	89
With an allowance recorded
Average Recorded Investment	181	173
Interest Income Recognized	3	7
Total
Average Recorded Investment	2,434	2,531
Interest Income Recognized	35	96
Consumer real estate secured by 1-4 family residential \| Home equity lines
With no related allowance recorded
Average Recorded Investment	100	300
Interest Income Recognized	6	21
Total
Average Recorded Investment	100	300
Interest Income Recognized	6	21
Consumer real estate secured by 1-4 family residential \| First deed of trust
With no related allowance recorded
Average Recorded Investment	1,816	1,830
Interest Income Recognized	23	60
With an allowance recorded
Average Recorded Investment	116	124
Interest Income Recognized		4
Total
Average Recorded Investment	1,932	1,954
Interest Income Recognized	23	64
Consumer real estate secured by 1-4 family residential \| Second deed of trust
With no related allowance recorded
Average Recorded Investment	337	228
Interest Income Recognized	3	8
With an allowance recorded
Average Recorded Investment	65	49
Interest Income Recognized	3	3
Total
Average Recorded Investment	402	277
Interest Income Recognized	6	11
Commercial and industrial loans
With no related allowance recorded
Average Recorded Investment	7,763	8,088
Interest Income Recognized	72	221
With an allowance recorded
Average Recorded Investment	452	440
Interest Income Recognized	7	18
Total
Average Recorded Investment	8,215	8,528
Interest Income Recognized	79	239
Commercial and industrial loans \| Commercial and industrial loans (except those secured by real estate)
With no related allowance recorded
Average Recorded Investment	119	136
Interest Income Recognized	2	3
Total
Average Recorded Investment	119	136
Interest Income Recognized	2	3
Consumer and other
With an allowance recorded
Average Recorded Investment	12	6
Total
Average Recorded Investment	$ 12	$ 6

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 https://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 https://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 https://asc.fasb.org/extlink&oid=123577603&loc=d3e5258-111524

Reference 2: 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 https://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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