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Loans, Allowance for Credit Losses, and Asset Quality Information (Schedule of Analysis of Payment Status of Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	$ 32,993	$ 35,076
Loans, gross	4,786,846	4,735,013	$ 4,776,911
Unamortized net deferred loan fees	(4,782)	(3,698)	(6,848)
Total loans	4,782,064	4,731,315	4,770,063
Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	3,354	16,318
Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	859	5,271
Accruing 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total loans	0	719
Accruing Current
Financing Receivable, Past Due [Line Items]
Total loans	4,749,640	4,677,629
Purchased credit impaired
Financing Receivable, Past Due [Line Items]
Nonaccrual loans		0
Loans, gross		8,591
Purchased credit impaired | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans		328
Purchased credit impaired | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans		112
Purchased credit impaired | Accruing 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total loans		719
Purchased credit impaired | Accruing Current
Financing Receivable, Past Due [Line Items]
Total loans		7,432
Commercial, financial, and agricultural
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	9,476	9,681
Loans, gross	704,096	782,549	723,053
Commercial, financial, and agricultural | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	634	1,464
Commercial, financial, and agricultural | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	33	1,101
Commercial, financial, and agricultural | Accruing 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Commercial, financial, and agricultural | Accruing Current
Financing Receivable, Past Due [Line Items]
Total loans	693,953	770,166
Real estate, commercial | Real estate – construction, land development & other land loans
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	393	643
Loans, gross	566,417	570,672	648,590
Real estate, commercial | Real estate – construction, land development & other land loans | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	65	572
Real estate, commercial | Real estate – construction, land development & other land loans | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Real estate, commercial | Real estate – construction, land development & other land loans | Accruing 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Real estate, commercial | Real estate – construction, land development & other land loans | Accruing Current
Financing Receivable, Past Due [Line Items]
Total loans	565,959	569,307
Real estate, commercial | Real estate – mortgage – commercial and other
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	15,886	17,191
Loans, gross	2,262,492	2,049,203	1,959,078
Real estate, commercial | Real estate – mortgage – commercial and other | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	1,425	2,540
Real estate, commercial | Real estate – mortgage – commercial and other | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	0	3,111
Real estate, commercial | Real estate – mortgage – commercial and other | Accruing 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Real estate, commercial | Real estate – mortgage – commercial and other | Accruing Current
Financing Receivable, Past Due [Line Items]
Total loans	2,245,181	2,022,422
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	5,765	6,048
Loans, gross	914,318	972,378	1,076,411
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	672	10,146
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	610	869
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Accruing 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Accruing Current
Financing Receivable, Past Due [Line Items]
Total loans	907,271	951,088
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	1,345	1,333
Loans, gross	285,595	306,256	318,618
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	474	1,088
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	159	42
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Accruing 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Accruing Current
Financing Receivable, Past Due [Line Items]
Total loans	283,617	303,693
Consumer loans
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	128	180
Loans, gross	53,928	53,955	$ 51,161
Consumer loans | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	84	180
Consumer loans | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	57	36
Consumer loans | Accruing 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Consumer loans | Accruing Current
Financing Receivable, Past Due [Line Items]
Total loans	53,659	53,521
Loans, Excluding Purchased Credit Impaired Loans | Commercial, financial, and agricultural
Financing Receivable, Past Due [Line Items]
Loans, gross	704,096	782,412
Loans, Excluding Purchased Credit Impaired Loans | Real estate, commercial | Real estate – construction, land development & other land loans
Financing Receivable, Past Due [Line Items]
Loans, gross	566,417	570,522
Loans, Excluding Purchased Credit Impaired Loans | Real estate, commercial | Real estate – mortgage – commercial and other
Financing Receivable, Past Due [Line Items]
Loans, gross	2,262,492	2,045,264
Loans, Excluding Purchased Credit Impaired Loans | Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages
Financing Receivable, Past Due [Line Items]
Loans, gross	914,318	968,151
Loans, Excluding Purchased Credit Impaired Loans | Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit
Financing Receivable, Past Due [Line Items]
Loans, gross	285,595	306,156
Loans, Excluding Purchased Credit Impaired Loans | Consumer loans
Financing Receivable, Past Due [Line Items]
Loans, gross	$ 53,928	$ 53,917

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