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Loans and Asset Quality Information - Schedule of Recorded Investment in Loans by Credit Quality Indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 4,735,013	$ 4,451,525	$ 4,247,765
Unamortized net deferred loan costs	(3,698)	1,941	1,299
Total loans	4,731,315	4,453,466	4,249,064
PCI Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	8,591	12,664
Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	782,549	504,271	457,037
Commercial, financial, and agricultural | Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	782,412	504,058
Real estate, commercial | Real estate – construction, land development & other land loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	570,672	530,866	518,976
Real estate, commercial | Real estate – mortgage – commercial and other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	2,049,203	1,917,280	1,787,022
Real estate, commercial | Loans, Excluding Purchased Credit Impaired Loans | Real estate – construction, land development & other land loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	570,522	530,700
Real estate, commercial | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – commercial and other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	2,045,264	1,910,650
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	972,378	1,105,014	1,054,176
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	306,256	337,922	359,162
Real estate, mortgage | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – residential (1-4 family) first mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	968,151	1,099,671
Real estate, mortgage | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – home equity loans / lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	306,156	337,699
Installment loans to individuals
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	53,955	56,172	$ 71,392
Installment loans to individuals | Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	53,917	56,083
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	4,613,259	4,338,381
Pass | PCI Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	6,901	8,098
Pass | Commercial, financial, and agricultural | Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	762,091	486,081
Pass | Real estate, commercial | Loans, Excluding Purchased Credit Impaired Loans | Real estate – construction, land development & other land loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	560,845	522,767
Pass | Real estate, commercial | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – commercial and other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,988,684	1,873,594
Pass | Real estate, mortgage | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – residential (1-4 family) first mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	943,455	1,063,735
Pass | Real estate, mortgage | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – home equity loans / lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	297,795	328,903
Pass | Installment loans to individuals | Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	53,488	55,203
Special Mention Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	61,260	50,321
Special Mention Loans | PCI Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	85	2,590
Special Mention Loans | Commercial, financial, and agricultural | Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	9,553	7,998
Special Mention Loans | Real estate, commercial | Loans, Excluding Purchased Credit Impaired Loans | Real estate – construction, land development & other land loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	7,877	4,075
Special Mention Loans | Real estate, commercial | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – commercial and other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	34,588	20,800
Special Mention Loans | Real estate, mortgage | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – residential (1-4 family) first mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	7,609	13,187
Special Mention Loans | Real estate, mortgage | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – home equity loans / lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,468	1,258
Special Mention Loans | Installment loans to individuals | Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	80	413
Classified Accruing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	25,418	37,957
Classified Accruing Loans | PCI Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,605	1,976
Classified Accruing Loans | Commercial, financial, and agricultural | Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,087	4,461
Classified Accruing Loans | Real estate, commercial | Loans, Excluding Purchased Credit Impaired Loans | Real estate – construction, land development & other land loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,157	2,791
Classified Accruing Loans | Real estate, commercial | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – commercial and other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	4,801	7,436
Classified Accruing Loans | Real estate, mortgage | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – residential (1-4 family) first mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	11,039	15,197
Classified Accruing Loans | Real estate, mortgage | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – home equity loans / lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	5,560	5,741
Classified Accruing Loans | Installment loans to individuals | Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	169	355
Classified Nonaccrual Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	35,076	24,866
Classified Nonaccrual Loans | PCI Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	0	0
Classified Nonaccrual Loans | Commercial, financial, and agricultural | Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	9,681	5,518
Classified Nonaccrual Loans | Real estate, commercial | Loans, Excluding Purchased Credit Impaired Loans | Real estate – construction, land development & other land loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	643	1,067
Classified Nonaccrual Loans | Real estate, commercial | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – commercial and other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	17,191	8,820
Classified Nonaccrual Loans | Real estate, mortgage | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – residential (1-4 family) first mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	6,048	7,552
Classified Nonaccrual Loans | Real estate, mortgage | Loans, Excluding Purchased Credit Impaired Loans | Real estate – mortgage – home equity loans / lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,333	1,797
Classified Nonaccrual Loans | Installment loans to individuals | Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 180	$ 112

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

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Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

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