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Purchased Loans - Impact of Modifications Classified as Restructured Loans (Details) - Purchased loans $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($) loan	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($) loan
Restructured loans
Number of Loans | loan		6	3	13
Pre- Modification Outstanding Recorded Investment		$ 3,148	$ 1,161	$ 5,262
Post- Modification Outstanding Recorded Investment		$ 2,888	$ 1,161	$ 4,896
Commercial, financial, agricultural
Restructured loans
Number of Loans | loan			1	1
Pre- Modification Outstanding Recorded Investment			$ 135	$ 1,029
Post- Modification Outstanding Recorded Investment			$ 135	$ 1,031
Real estate – 1-4 family mortgage:
Restructured loans
Number of Loans | loan				5
Pre- Modification Outstanding Recorded Investment				$ 493
Post- Modification Outstanding Recorded Investment				$ 389
Real estate – 1-4 family mortgage: | Primary
Restructured loans
Number of Loans | loan	1	2	2	4
Pre- Modification Outstanding Recorded Investment	$ 164	$ 44	$ 1,026	$ 334
Post- Modification Outstanding Recorded Investment	$ 164	$ 44	$ 1,026	$ 227
Real estate – 1-4 family mortgage: | Home equity
Restructured loans
Number of Loans | loan				1
Pre- Modification Outstanding Recorded Investment				$ 159
Post- Modification Outstanding Recorded Investment				$ 162
Real estate – commercial mortgage:
Restructured loans
Number of Loans | loan				6
Pre- Modification Outstanding Recorded Investment				$ 3,715
Post- Modification Outstanding Recorded Investment				$ 3,457
Real estate – commercial mortgage: | Owner-occupied
Restructured loans
Number of Loans | loan		4		5
Pre- Modification Outstanding Recorded Investment		$ 3,104		$ 3,173
Post- Modification Outstanding Recorded Investment		$ 2,844		$ 2,913
Real estate – commercial mortgage: | Non-owner occupied
Restructured loans
Number of Loans | loan				1
Pre- Modification Outstanding Recorded Investment				$ 542
Post- Modification Outstanding Recorded Investment				$ 544
Installment loans to individuals
Restructured loans
Number of Loans | loan				1
Pre- Modification Outstanding Recorded Investment				$ 25
Post- Modification Outstanding Recorded Investment				$ 19

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- Definition

Troubled Debt Restructuring Financing Receivable Modifications [Abstract]

+ References

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- Definition

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=123577603&loc=SL6953676-111524

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- Definition

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=123577603&loc=SL6953676-111524

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- Definition

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=123577603&loc=SL6953676-111524

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