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Purchased Loans - Restructured Loans by Class (Details) - Purchased $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	13	5	5
Pre-Modification Outstanding Recorded Investment	$ 5,262	$ 2,931	$ 712
Post-Modification Outstanding Recorded Investment	$ 4,896	$ 2,927	$ 552
Commercial, financial, agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	2	1
Pre-Modification Outstanding Recorded Investment	$ 1,029	$ 2,778	$ 48
Post-Modification Outstanding Recorded Investment	$ 1,031	$ 2,778	$ 44
Real estate - 1-4 family mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	5	2	2
Pre-Modification Outstanding Recorded Investment	$ 493	$ 73	$ 142
Post-Modification Outstanding Recorded Investment	$ 389	$ 73	$ 127
Real estate - 1-4 family mortgage | Primary
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	4
Pre-Modification Outstanding Recorded Investment	$ 334
Post-Modification Outstanding Recorded Investment	$ 227
Real estate - 1-4 family mortgage | Home Equity Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1
Pre-Modification Outstanding Recorded Investment	$ 159
Post-Modification Outstanding Recorded Investment	$ 162
Real estate - commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	6	1	2
Pre-Modification Outstanding Recorded Investment	$ 3,715	$ 80	$ 522
Post-Modification Outstanding Recorded Investment	$ 3,457	$ 76	$ 381
Real estate - commercial mortgage | Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	5
Pre-Modification Outstanding Recorded Investment	$ 3,173
Post-Modification Outstanding Recorded Investment	$ 2,913
Real estate - commercial mortgage | Non-owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1
Pre-Modification Outstanding Recorded Investment	$ 542
Post-Modification Outstanding Recorded Investment	$ 544
Installment loans to individuals
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1
Pre-Modification Outstanding Recorded Investment	$ 25
Post-Modification Outstanding Recorded Investment	$ 19

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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Amount, after troubled debt restructuring, of modified financing receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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