Loans and Asset Quality Information (Schedule of Recorded Investment in Loans by Credit Quality Indicators) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	$ 4,550,996	$ 4,451,525	$ 4,302,163
Unamortized net deferred loan costs	1,712	1,941	1,624
Total loans	4,552,708	4,453,466	4,303,787
Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	521,470	504,271	468,388
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	54,133	56,172	69,503
Loans, Excluding Purchased Credit Impaired Loans | Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	521,283	504,058
Loans, Excluding Purchased Credit Impaired Loans | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	54,059	56,083
Real estate – construction, land development & other land loans | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	590,485	530,866	553,760
Real estate – construction, land development & other land loans | Loans, Excluding Purchased Credit Impaired Loans | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	590,322	530,700
Real estate – mortgage – residential (1-4 family) first mortgages | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	1,083,022	1,105,014	1,061,049
Real estate – mortgage – residential (1-4 family) first mortgages | Loans, Excluding Purchased Credit Impaired Loans | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	1,077,721	1,099,671
Real estate – mortgage – home equity loans / lines of credit | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	331,170	337,922	354,669
Real estate – mortgage – home equity loans / lines of credit | Loans, Excluding Purchased Credit Impaired Loans | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	331,077	337,699
Real estate – mortgage – commercial and other | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	1,970,716	1,917,280	$ 1,794,794
Real estate – mortgage – commercial and other | Loans, Excluding Purchased Credit Impaired Loans | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	1,966,695	1,910,650
PCI Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	9,839	12,664
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	4,439,505	4,338,381
Pass | Loans, Excluding Purchased Credit Impaired Loans | Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	504,858	486,081
Pass | Loans, Excluding Purchased Credit Impaired Loans | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	53,532	55,203
Pass | Real estate – construction, land development & other land loans | Loans, Excluding Purchased Credit Impaired Loans | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	583,176	522,767
Pass | Real estate – mortgage – residential (1-4 family) first mortgages | Loans, Excluding Purchased Credit Impaired Loans | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	1,046,994	1,063,735
Pass | Real estate – mortgage – home equity loans / lines of credit | Loans, Excluding Purchased Credit Impaired Loans | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	322,000	328,903
Pass | Real estate – mortgage – commercial and other | Loans, Excluding Purchased Credit Impaired Loans | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	1,920,923	1,873,594
Pass | PCI Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	8,022	8,098
Special Mention Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	50,974	50,321
Special Mention Loans | Loans, Excluding Purchased Credit Impaired Loans | Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	7,736	7,998
Special Mention Loans | Loans, Excluding Purchased Credit Impaired Loans | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	207	413
Special Mention Loans | Real estate – construction, land development & other land loans | Loans, Excluding Purchased Credit Impaired Loans | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	4,743	4,075
Special Mention Loans | Real estate – mortgage – residential (1-4 family) first mortgages | Loans, Excluding Purchased Credit Impaired Loans | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	8,427	13,187
Special Mention Loans | Real estate – mortgage – home equity loans / lines of credit | Loans, Excluding Purchased Credit Impaired Loans | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	1,217	1,258
Special Mention Loans | Real estate – mortgage – commercial and other | Loans, Excluding Purchased Credit Impaired Loans | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	28,557	20,800
Special Mention Loans | PCI Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	87	2,590
Classified Accruing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	35,451	37,957
Classified Accruing Loans | Loans, Excluding Purchased Credit Impaired Loans | Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	4,986	4,461
Classified Accruing Loans | Loans, Excluding Purchased Credit Impaired Loans | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	207	355
Classified Accruing Loans | Real estate – construction, land development & other land loans | Loans, Excluding Purchased Credit Impaired Loans | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	1,445	2,791
Classified Accruing Loans | Real estate – mortgage – residential (1-4 family) first mortgages | Loans, Excluding Purchased Credit Impaired Loans | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	13,719	15,197
Classified Accruing Loans | Real estate – mortgage – home equity loans / lines of credit | Loans, Excluding Purchased Credit Impaired Loans | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	5,986	5,741
Classified Accruing Loans | Real estate – mortgage – commercial and other | Loans, Excluding Purchased Credit Impaired Loans | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	7,378	7,436
Classified Accruing Loans | PCI Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	1,730	1,976
Classified Nonaccrual Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	25,066	24,866
Classified Nonaccrual Loans | Loans, Excluding Purchased Credit Impaired Loans | Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	3,703	5,518
Classified Nonaccrual Loans | Loans, Excluding Purchased Credit Impaired Loans | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	113	112
Classified Nonaccrual Loans | Real estate – construction, land development & other land loans | Loans, Excluding Purchased Credit Impaired Loans | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	958	1,067
Classified Nonaccrual Loans | Real estate – mortgage – residential (1-4 family) first mortgages | Loans, Excluding Purchased Credit Impaired Loans | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	8,581	7,552
Classified Nonaccrual Loans | Real estate – mortgage – home equity loans / lines of credit | Loans, Excluding Purchased Credit Impaired Loans | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	1,874	1,797
Classified Nonaccrual Loans | Real estate – mortgage – commercial and other | Loans, Excluding Purchased Credit Impaired Loans | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	9,837	8,820
Classified Nonaccrual Loans | PCI Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, gross	$ 0	$ 0