Loans and Allowance for Loan Losses - Past Due and Non-accrual Loans (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Aging information for the Company's past due and non-accrual loans
90 Days Past Due And Still Accruing	$ 0	$ 17
Nonaccrual status	34,233	34,559
Loans held for investment	1,276,185	1,286,967
Amount of loans accepting forbearance	43,500	57,100
Loan modifications	72,800
Loan Modifications under CARES Act
Aging information for the Company's past due and non-accrual loans
Nonaccrual status	29,300
Current or Less Than 30 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	1,240,025	1,251,344
30 - 89 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	1,927	1,047
Commercial, financial, and agricultural
Aging information for the Company's past due and non-accrual loans
90 Days Past Due And Still Accruing	0	0
Nonaccrual status	6,591	6,717
Loans held for investment	251,943	272,918
Commercial, financial, and agricultural \| Current or Less Than 30 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	245,019	265,821
Commercial, financial, and agricultural \| 30 - 89 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	333	380
Residential real estate \| Construction
Aging information for the Company's past due and non-accrual loans
90 Days Past Due And Still Accruing	0	0
Nonaccrual status	189	192
Loans held for investment	33,962	29,692
Residential real estate \| Construction \| Current or Less Than 30 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	33,773	29,500
Residential real estate \| Construction \| 30 - 89 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	0	0
Residential real estate \| Mortgages
Aging information for the Company's past due and non-accrual loans
90 Days Past Due And Still Accruing	0	0
Nonaccrual status	1,917	2,105
Loans held for investment	258,259	262,339
Residential real estate \| Mortgages \| Current or Less Than 30 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	255,172	259,688
Residential real estate \| Mortgages \| 30 - 89 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	1,170	546
Commercial real estate \| Construction
Aging information for the Company's past due and non-accrual loans
90 Days Past Due And Still Accruing	0	0
Nonaccrual status	198	200
Loans held for investment	78,576	78,144
Commercial real estate \| Construction \| Current or Less Than 30 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	78,378	77,944
Commercial real estate \| Construction \| 30 - 89 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	0	0
Commercial real estate \| Mortgages
Aging information for the Company's past due and non-accrual loans
90 Days Past Due And Still Accruing	0	0
Nonaccrual status	25,309	25,314
Loans held for investment	628,178	617,133
Commercial real estate \| Mortgages \| Current or Less Than 30 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	602,502	591,815
Commercial real estate \| Mortgages \| 30 - 89 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	367	4
Installment and other consumer
Aging information for the Company's past due and non-accrual loans
90 Days Past Due And Still Accruing	0	17
Nonaccrual status	29	31
Loans held for investment	25,267	26,741
Installment and other consumer \| Current or Less Than 30 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	25,181	26,576
Installment and other consumer \| 30 - 89 Days Past Due
Aging information for the Company's past due and non-accrual loans
Financing receivable, recorded investment, past due	$ 57	$ 117

The amount of loans accepting forbearance.

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Amount of financing receivable 90 days or more past due and still accruing.

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Amount of financing receivable on nonaccrual status.

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Amount of financing receivable modified on trial basis.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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