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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	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	$ 31,268	$ 35,076
Loans, gross	4,873,230	4,735,013	$ 4,819,175
Unamortized net deferred loan fees	(3,389)	(3,698)	(5,439)
Total loans	4,869,841	4,731,315	4,813,736
Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	2,331	16,318
Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	1,233	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	4,838,398	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	9,529	9,681
Loans, gross	612,554	782,549	804,831
Commercial, financial, and agricultural | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	584	1,464
Commercial, financial, and agricultural | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	60	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	602,381	770,166
Real estate, commercial | Real estate – construction, land development & other land loans
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	373	643
Loans, gross	588,103	570,672	653,120
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	0	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	587,730	569,307
Real estate, commercial | Real estate – mortgage – commercial and other
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	15,923	17,191
Loans, gross	2,423,341	2,049,203	1,983,622
Real estate, commercial | Real estate – mortgage – commercial and other | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	346	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	334	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	2,406,738	2,022,422
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	4,334	6,048
Loans, gross	914,266	972,378	1,017,087
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	668	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	738	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	908,526	951,088
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	1,018	1,333
Loans, gross	281,219	306,256	310,326
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	606	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	67	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	279,528	303,693
Consumer loans
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	91	180
Loans, gross	53,747	53,955	$ 50,189
Consumer loans | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	127	180
Consumer loans | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	34	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	53,495	53,521
Loans, Excluding Purchased Credit Impaired Loans | Commercial, financial, and agricultural
Financing Receivable, Past Due [Line Items]
Loans, gross	612,554	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	588,103	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	2,423,341	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	914,266	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	281,219	306,156
Loans, Excluding Purchased Credit Impaired Loans | Consumer loans
Financing Receivable, Past Due [Line Items]
Loans, gross	$ 53,747	$ 53,917

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