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Loans - Credit Risk Rating for Commercial, Construction and Non-Consumer Related Loans (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($) rating	Dec. 31, 2020 USD ($)
Receivables [Abstract]
Number of risk rating approaches | rating	2
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	$ 799,970	$ 645,825
Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	51,135	47,514
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	309,727	282,951
Commercial Real Estate | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	172,120	37,236
Commercial Real Estate | Home improvement and home equity loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	83	107
Real Estate Construction and Development
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	165,370	175,016
Agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	56,091	51,079
Commercial, Construction and Other Non-Consumer Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	582,323	556,560
Installment and student loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	53,411	61,508
Real Estate and Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	225,614	98,851
Grades 1 and 2 | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	6,564	9,811
Grades 1 and 2 | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	0	0
Grades 1 and 2 | Real Estate Construction and Development
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	0	0
Grades 1 and 2 | Agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	0	30
Grades 1 and 2 | Commercial, Construction and Other Non-Consumer Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	6,564	9,841
Grade 3 | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	0	0
Grade 3 | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	263	519
Grade 3 | Real Estate Construction and Development
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	0	0
Grade 3 | Agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	0	0
Grade 3 | Commercial, Construction and Other Non-Consumer Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	263	519
Grades 4 and 5 – pass | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	44,565	35,919
Grades 4 and 5 – pass | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	274,214	267,215
Grades 4 and 5 – pass | Real Estate Construction and Development
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	154,097	163,959
Grades 4 and 5 – pass | Agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	42,192	49,006
Grades 4 and 5 – pass | Commercial, Construction and Other Non-Consumer Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	515,068	516,099
Grade 6 – special mention | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	0	1,307
Grade 6 – special mention | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	35,250	14,343
Grade 6 – special mention | Real Estate Construction and Development
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	0	0
Grade 6 – special mention | Agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	11,537	1,434
Grade 6 – special mention | Commercial, Construction and Other Non-Consumer Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	46,787	17,084
Grade 7 – substandard | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	6	477
Grade 7 – substandard | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	0	874
Grade 7 – substandard | Real Estate Construction and Development
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	11,273	11,057
Grade 7 – substandard | Agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	2,362	609
Grade 7 – substandard | Commercial, Construction and Other Non-Consumer Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	13,641	13,017
Not graded | Commercial Real Estate | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	161,668	27,484
Not graded | Commercial Real Estate | Home improvement and home equity loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	70	92
Not graded | Installment and student loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	52,667	60,414
Not graded | Real Estate and Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	214,405	87,990
Pass | Commercial Real Estate | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	10,452	9,752
Pass | Commercial Real Estate | Home improvement and home equity loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	13	15
Pass | Installment and student loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	426	570
Pass | Real Estate and Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	10,891	10,337
Special mention | Commercial Real Estate | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	0	0
Special mention | Commercial Real Estate | Home improvement and home equity loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	0	0
Special mention | Installment and student loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	0	11
Special mention | Real Estate and Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	0	11
Substandard | Commercial Real Estate | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	0	0
Substandard | Commercial Real Estate | Home improvement and home equity loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	0	0
Substandard | Installment and student loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	318	513
Substandard | Real Estate and Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	318	513
Doubtful | Commercial Real Estate | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	0	0
Doubtful | Commercial Real Estate | Home improvement and home equity loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	0	0
Doubtful | Installment and student loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	0	0
Doubtful | Real Estate and Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans outstanding	$ 0	$ 0
Minimum | Grades 4 and 5 – pass
Financing Receivable, Credit Quality Indicator [Line Items]
Notes receivable, period of loss recognition	3 years
Maximum | Grades 4 and 5 – pass
Financing Receivable, Credit Quality Indicator [Line Items]
Notes receivable, period of loss recognition	4 years

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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
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-Section 45
-Paragraph 2
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