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Loans and Asset Quality Information (Summary of Major Categories of Total Loans Outstanding) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Loans and Leases Receivable Disclosure [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
Percentage	100.00%	100.00%
SBA Loans
Loans and Leases Receivable Disclosure [Line Items]
Total loans	$ 147,842	$ 165,182
SBA Loans, Guaranteed Portion
Loans and Leases Receivable Disclosure [Line Items]
Total loans	27,985	54,400
SBA Loans, Unguaranteed Portion
Loans and Leases Receivable Disclosure [Line Items]
Total loans	119,857	110,782
SBA Loans, Sold Portion
Loans and Leases Receivable Disclosure [Line Items]
Total loans	324,231	316,730
Commercial, financial, and agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans, gross	$ 521,470	$ 504,271	468,388
Percentage	12.00%	11.00%
Real estate, commercial | Real estate – construction, land development & other land loans
Loans and Leases Receivable Disclosure [Line Items]
Loans, gross	$ 590,485	$ 530,866	553,760
Percentage	13.00%	12.00%
Real estate, commercial | Real estate – mortgage – commercial and other
Loans and Leases Receivable Disclosure [Line Items]
Loans, gross	$ 1,970,716	$ 1,917,280	1,794,794
Percentage	43.00%	43.00%
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages
Loans and Leases Receivable Disclosure [Line Items]
Loans, gross	$ 1,083,022	$ 1,105,014	1,061,049
Percentage	24.00%	25.00%
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit
Loans and Leases Receivable Disclosure [Line Items]
Loans, gross	$ 331,170	$ 337,922	354,669
Percentage	7.00%	8.00%
Consumer loans
Loans and Leases Receivable Disclosure [Line Items]
Loans, gross	$ 54,133	$ 56,172	$ 69,503
Percentage	1.00%	1.00%

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