Loans and allowance for loan losses - Average recorded investment in impaired loans (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
With no related allowance recorded
Average Recorded Investment	$ 9,157	$ 11,503
Interest Income Recognized	98	128
With an allowance recorded
Average Recorded Investment	1,800	2,101
Interest Income Recognized	22	20
Total
Average Recorded Investment	10,957	13,604
Interest Income Recognized	120	148
Construction And Land Development Commercial [Member]
With no related allowance recorded
Average Recorded Investment	315	742
Total
Average Recorded Investment	315	768
Commercial [Member]
With no related allowance recorded
Average Recorded Investment	315	475
With an allowance recorded
Average Recorded Investment		26
Total
Average Recorded Investment	315	501
Residential [Member]
With no related allowance recorded
Average Recorded Investment		267
Total
Average Recorded Investment		267
Commercial Real Estate [Member]
With no related allowance recorded
Average Recorded Investment	5,020	6,057
Interest Income Recognized	61	65
With an allowance recorded
Average Recorded Investment	1,420	1,461
Interest Income Recognized	15	15
Total
Average Recorded Investment	6,440	7,518
Interest Income Recognized	76	80
Owner Occupied [Member]
With no related allowance recorded
Average Recorded Investment	2,696	3,460
Interest Income Recognized	29	42
With an allowance recorded
Average Recorded Investment	1,420	1,461
Interest Income Recognized	15	15
Total
Average Recorded Investment	4,116	4,921
Interest Income Recognized	44	57
Non-Owner Occupied [Member]
With no related allowance recorded
Average Recorded Investment	2,324	2,597
Interest Income Recognized	32	23
Total
Average Recorded Investment	2,324	2,597
Interest Income Recognized	32	23
Home equity lines [Member]
With no related allowance recorded
Average Recorded Investment	363	550
Interest Income Recognized	4
With an allowance recorded
Average Recorded Investment		550
Total
Average Recorded Investment	363
Interest Income Recognized	4
First Deed of Trust [Member]
With no related allowance recorded
Average Recorded Investment	2,072	2,972
Interest Income Recognized	19	42
With an allowance recorded
Average Recorded Investment	136	262
Interest Income Recognized	1	3
Total
Average Recorded Investment	2,208	3,234
Interest Income Recognized	20	45
Second Deed of Trust [Member]
With no related allowance recorded
Average Recorded Investment	740	704
Interest Income Recognized	14	13
With an allowance recorded
Average Recorded Investment	78	162
Interest Income Recognized		2
Total
Average Recorded Investment	818	866
Interest Income Recognized	14	15
Consumer Real Estate [Member]
With no related allowance recorded
Average Recorded Investment	3,175	4,226
Interest Income Recognized	37	55
With an allowance recorded
Average Recorded Investment	214	424
Interest Income Recognized	1	5
Total
Average Recorded Investment	3,389	4,650
Interest Income Recognized	38	60
Commercial and industrial loans (except those secured by real estate)
With no related allowance recorded
Average Recorded Investment	646	477
Interest Income Recognized		8
With an allowance recorded
Average Recorded Investment	162	176
Interest Income Recognized	6
Total
Average Recorded Investment	808	653
Interest Income Recognized	6	8
Consumer And Other [Member]
With no related allowance recorded
Average Recorded Investment	1	1
With an allowance recorded
Average Recorded Investment	4	14
Total
Average Recorded Investment	$ 5	$ 15

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=118936363&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=118936363&loc=d3e5258-111524

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- Definition

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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=118936363&loc=d3e5258-111524

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-Publisher FASB
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-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524

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