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Loans and Allowance for Loan Losses - TDRs and Loan Modifications (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) contract	Sep. 30, 2020 USD ($) contract	Sep. 30, 2021 USD ($) contract loan	Sep. 30, 2020 USD ($) contract	Dec. 31, 2020 USD ($)
Troubled Debt Restructurings
Troubled debt restructurings	$ 2,500,000		$ 2,500,000		$ 3,700,000
Amount of specific reserves related to TDRs which were allocated to the allowance for loan losses	$ 133,000		$ 133,000		214,000
Number of Contracts | contract	0		0	2
Pre- Modification			$ 0	$ 117,000
Post- Modification			0	121,000
Loans held for sale, at lower of cost or fair value	$ 4,576,000	$ 7,900,000	4,576,000	$ 7,900,000	5,099,000
Loan Modifications under the CARES Act
Nonaccrual status	32,835,000		32,835,000		34,559,000
Loan Modifications under CARES Act
Loan Modifications under the CARES Act
Loan modifications, amount	$ 11,300,000		$ 11,300,000
Loan modifications, percentage	0.90%		0.90%
Loan Modifications under CARES Act | Interest Only
Troubled Debt Restructurings
Number of Contracts | loan			2
90 days or more past due
Troubled Debt Restructurings
Number of contracts called for default and charged off | contract	0	0	0	1
Commercial, financial, and agricultural
Loan Modifications under the CARES Act
Nonaccrual status	$ 6,292,000		$ 6,292,000		6,717,000
Residential real estate | Mortgages
Troubled Debt Restructurings
Number of Contracts | contract			0	1
Pre- Modification			$ 0	$ 111,000
Post- Modification			0	$ 117,000
Loan Modifications under the CARES Act
Nonaccrual status	1,475,000		1,475,000		2,105,000
Commercial real estate | Mortgages
Loan Modifications under the CARES Act
Nonaccrual status	24,940,000		$ 24,940,000		25,314,000
Installment and other consumer
Troubled Debt Restructurings
Number of Contracts | contract			0	1
Pre- Modification			$ 0	$ 6,000
Post- Modification			0	$ 4,000
Loan Modifications under the CARES Act
Nonaccrual status	20,000		20,000		31,000
Performing TDRs
Troubled Debt Restructurings
Troubled debt restructurings	1,900,000		1,900,000		2,800,000
Non-performing TDRs - 90 days past due
Troubled Debt Restructurings
Troubled debt restructurings	$ 600,000		$ 600,000		$ 900,000

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