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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	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	$ 39,566	$ 35,076
Loans, gross	4,630,597	4,735,013	$ 4,550,996
Unamortized net deferred loan costs (fees)	(6,543)	(3,698)	1,712
Total loans	4,624,054	4,731,315	4,552,708
Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	9,179	16,318
Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	1,877	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	4,579,975	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	10,330	9,681
Loans, gross	768,318	782,549	521,470
Commercial, financial, and agricultural | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	787	1,464
Commercial, financial, and agricultural | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	286	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	756,915	770,166
Real estate, commercial | Real estate – construction, land development & other land loans
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	540	643
Loans, gross	548,508	570,672	590,485
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	938	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	91	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	546,939	569,307
Real estate, commercial | Real estate – mortgage – commercial and other
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	20,654	17,191
Loans, gross	2,049,507	2,049,203	1,970,716
Real estate, commercial | Real estate – mortgage – commercial and other | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	628	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	1,352	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	2,026,873	2,022,422
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	6,207	6,048
Loans, gross	916,169	972,378	1,083,022
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	6,257	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	80	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	903,625	951,088
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	1,676	1,333
Loans, gross	294,611	306,256	331,170
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	487	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	0	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	292,448	303,693
Consumer loans
Financing Receivable, Past Due [Line Items]
Nonaccrual loans	159	180
Loans, gross	53,484	53,955	$ 54,133
Consumer loans | Accruing 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	82	180
Consumer loans | Accruing 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	68	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	53,175	53,521
Loans, Excluding Purchased Credit Impaired Loans | Commercial, financial, and agricultural
Financing Receivable, Past Due [Line Items]
Loans, gross	768,318	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	548,508	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	2,049,507	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	916,169	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	294,611	306,156
Loans, Excluding Purchased Credit Impaired Loans | Consumer loans
Financing Receivable, Past Due [Line Items]
Loans, gross	$ 53,484	$ 53,917

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