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Loans and allowance for loan losses (Credit Quality Information-By Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	$ 583,384	$ 609,090
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	553,853	575,637
Monitor [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	16,457	14,637
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	8,415	13,526
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	4,659	5,290
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	105,067	145,145
Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	92,789	133,075
Commercial [Member] | Monitor [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	7,965	4,332
Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	4,262	7,386
Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	51	352
Commercial Real Estate [Member] | Commercial Mortgages-Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	128,834	108,222
Commercial Real Estate [Member] | Commercial Mortgages-Owner Occupied [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	116,098	98,623
Commercial Real Estate [Member] | Commercial Mortgages-Owner Occupied [Member] | Monitor [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	5,986	3,028
Commercial Real Estate [Member] | Commercial Mortgages-Owner Occupied [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	4,130	4,428
Commercial Real Estate [Member] | Commercial Mortgages-Owner Occupied [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	2,620	2,143
Commercial Real Estate [Member] | Commercial Mortgages-Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	179,113	171,069
Commercial Real Estate [Member] | Commercial Mortgages-Non-Owner Occupied [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	176,291	161,300
Commercial Real Estate [Member] | Commercial Mortgages-Non-Owner Occupied [Member] | Monitor [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	2,506	7,277
Commercial Real Estate [Member] | Commercial Mortgages-Non-Owner Occupied [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables		1,682
Commercial Real Estate [Member] | Commercial Mortgages-Non-Owner Occupied [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	316	810
Commercial Real Estate [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	30,202	30,272
Commercial Real Estate [Member] | Commercial Construction [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	30,202	30,272
Consumer [Member] | Consumer Unsecured [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	2,605	3,771
Consumer [Member] | Consumer Unsecured [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	2,581	3,740
Consumer [Member] | Consumer Unsecured [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	23	30
Consumer [Member] | Consumer Unsecured [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	1	1
Consumer [Member] | Consumer Secured [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	86,497	88,573
Consumer [Member] | Consumer Secured [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	86,265	88,044
Consumer [Member] | Consumer Secured [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	232	529
Residential [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	31,925	46,896
Residential [Member] | Residential Mortgages [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	30,486	45,441
Residential [Member] | Residential Mortgages [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	1,439	1,455
Residential [Member] | Residential Consumer Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	19,141	15,142
Residential [Member] | Residential Consumer Construction [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	$ 19,141	$ 15,142

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Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

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