Loans, Allowance for Credit Losses, and Asset Quality Information (Schedule of Recorded Investment in Loans by Credit Quality Indicators) (Details) - USD ($)
$ in Thousands

Loans, Allowance for Credit Losses, and Asset Quality Information (Schedule of Recorded Investment in Loans by Credit Quality Indicators) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
2021	$ 1,607,761
2020	1,167,652
2019	530,805
2018	342,793
2017	268,450
Prior	502,595
Revolving	453,174
Total	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
Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total	612,554	782,549	804,831
Commercial, financial, and agricultural \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	612,554	782,412
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	12,829
2020	24,742
2019	3,792
2018	2,004
2017	798
Prior	688
Revolving	8,894
Total	53,747	53,955	50,189
Consumer loans \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	53,747	53,917
Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
2021	177,403
2020	137,763
2019	93,498
2018	80,947
2017	16,168
Prior	19,423
Revolving	87,352
Total	612,554
Real estate – construction, land development & other land loans \| Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	351,199
2020	140,089
2019	52,856
2018	9,859
2017	11,842
Prior	9,419
Revolving	12,839
Total	588,103	570,672	653,120
Real estate – construction, land development & other land loans \| Real estate, commercial \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	588,103	570,522
Real estate – mortgage – residential (1-4 family) first mortgages \| Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2021	171,141
2020	207,671
2019	112,250
2018	75,728
2017	84,781
Prior	254,414
Revolving	8,281
Total	914,266	972,378	1,017,087
Real estate – mortgage – residential (1-4 family) first mortgages \| Real estate, mortgage \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	914,266	968,151
Real estate – mortgage – home equity loans / lines of credit \| Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2021	1,531
2020	454
2019	632
2018	1,340
2017	268
Prior	1,766
Revolving	275,228
Total	281,219	306,256	310,326
Real estate – mortgage – home equity loans / lines of credit \| Real estate, mortgage \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	281,219	306,156
Real estate – mortgage – commercial and other \| Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	893,658
2020	656,933
2019	267,777
2018	172,915
2017	154,593
Prior	216,885
Revolving	60,580
Total	2,423,341	2,049,203	$ 1,983,622
Real estate – mortgage – commercial and other \| Real estate, commercial \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,423,341	2,045,264
Purchased credit impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Total		8,591
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total		4,613,259
Pass \| Commercial, financial, and agricultural \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		762,091
Pass \| Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	12,826
2020	24,684
2019	3,770
2018	1,994
2017	792
Prior	653
Revolving	8,704
Total	53,423
Pass \| Consumer loans \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		53,488
Pass \| Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
2021	177,374
2020	136,471
2019	88,627
2018	70,541
2017	15,904
Prior	19,406
Revolving	84,328
Total	592,651
Pass \| Real estate – construction, land development & other land loans \| Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	350,577
2020	139,023
2019	47,604
2018	9,676
2017	11,717
Prior	9,290
Revolving	12,828
Total	580,715
Pass \| Real estate – construction, land development & other land loans \| Real estate, commercial \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		560,845
Pass \| Real estate – mortgage – residential (1-4 family) first mortgages \| Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2021	169,818
2020	206,945
2019	111,517
2018	74,291
2017	83,813
Prior	239,602
Revolving	7,315
Total	893,301
Pass \| Real estate – mortgage – residential (1-4 family) first mortgages \| Real estate, mortgage \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		943,455
Pass \| Real estate – mortgage – home equity loans / lines of credit \| Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2021	1,453
2020	345
2019	548
2018	1,340
2017	268
Prior	1,251
Revolving	268,863
Total	274,068
Pass \| Real estate – mortgage – home equity loans / lines of credit \| Real estate, mortgage \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		297,795
Pass \| Real estate – mortgage – commercial and other \| Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	882,823
2020	651,882
2019	261,293
2018	164,575
2017	148,376
Prior	216,052
Revolving	60,035
Total	2,385,036
Pass \| Real estate – mortgage – commercial and other \| Real estate, commercial \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		1,988,684
Pass \| Purchased credit impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Total		6,901
Special Mention Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	40,700	61,260
Special Mention Loans \| Commercial, financial, and agricultural \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		9,553
Special Mention Loans \| Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	0
2018	0
2017	0
Prior	0
Revolving	0
Total	0
Special Mention Loans \| Consumer loans \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		80
Special Mention Loans \| Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
2021	14
2020	613
2019	3,467
2018	2,823
2017	192
Prior	5
Revolving	2,702
Total	9,816
Special Mention Loans \| Real estate – construction, land development & other land loans \| Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	43
2020	749
2019	5,135
2018	0
2017	111
Prior	12
Revolving	11
Total	6,061
Special Mention Loans \| Real estate – construction, land development & other land loans \| Real estate, commercial \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		7,877
Special Mention Loans \| Real estate – mortgage – residential (1-4 family) first mortgages \| Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2021	1,007
2020	571
2019	193
2018	141
2017	315
Prior	3,052
Revolving	95
Total	5,374
Special Mention Loans \| Real estate – mortgage – residential (1-4 family) first mortgages \| Real estate, mortgage \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		7,609
Special Mention Loans \| Real estate – mortgage – home equity loans / lines of credit \| Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019	16
2018	0
2017	0
Prior	19
Revolving	1,080
Total	1,115
Special Mention Loans \| Real estate – mortgage – home equity loans / lines of credit \| Real estate, mortgage \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		1,468
Special Mention Loans \| Real estate – mortgage – commercial and other \| Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	4,109
2020	4,918
2019	4,613
2018	2,049
2017	1,890
Prior	222
Revolving	545
Total	18,346
Special Mention Loans \| Real estate – mortgage – commercial and other \| Real estate, commercial \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		34,588
Special Mention Loans \| Purchased credit impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Total		85
Classified
Financing Receivable, Credit Quality Indicator [Line Items]
Total	53,300
Classified \| Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
2021	3
2020	58
2019	22
2018	10
2017	6
Prior	35
Revolving	190
Total	324
Classified \| Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
2021	15
2020	679
2019	1,404
2018	7,583
2017	72
Prior	12
Revolving	322
Total	10,087
Classified \| Real estate – construction, land development & other land loans \| Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	579
2020	317
2019	117
2018	183
2017	14
Prior	117
Revolving	0
Total	1,327
Classified \| Real estate – mortgage – residential (1-4 family) first mortgages \| Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2021	316
2020	155
2019	540
2018	1,296
2017	653
Prior	11,760
Revolving	871
Total	15,591
Classified \| Real estate – mortgage – home equity loans / lines of credit \| Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2021	78
2020	109
2019	68
2018	0
2017	0
Prior	496
Revolving	5,285
Total	6,036
Classified \| Real estate – mortgage – commercial and other \| Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	6,726
2020	133
2019	1,871
2018	6,291
2017	4,327
Prior	611
Revolving	0
Total	$ 19,959
Classified Accruing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		25,418
Classified Accruing Loans \| Commercial, financial, and agricultural \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		1,087
Classified Accruing Loans \| Consumer loans \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		169
Classified Accruing Loans \| Real estate – construction, land development & other land loans \| Real estate, commercial \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		1,157
Classified Accruing Loans \| Real estate – mortgage – residential (1-4 family) first mortgages \| Real estate, mortgage \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		11,039
Classified Accruing Loans \| Real estate – mortgage – home equity loans / lines of credit \| Real estate, mortgage \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		5,560
Classified Accruing Loans \| Real estate – mortgage – commercial and other \| Real estate, commercial \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		4,801
Classified Accruing Loans \| Purchased credit impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Total		1,605
Classified Nonaccrual Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		35,076
Classified Nonaccrual Loans \| Commercial, financial, and agricultural \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		9,681
Classified Nonaccrual Loans \| Consumer loans \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		180
Classified Nonaccrual Loans \| Real estate – construction, land development & other land loans \| Real estate, commercial \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		643
Classified Nonaccrual Loans \| Real estate – mortgage – residential (1-4 family) first mortgages \| Real estate, mortgage \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		6,048
Classified Nonaccrual Loans \| Real estate – mortgage – home equity loans / lines of credit \| Real estate, mortgage \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		1,333
Classified Nonaccrual Loans \| Real estate – mortgage – commercial and other \| Real estate, commercial \| Loans, Excluding Purchased Credit Impaired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total		17,191
Classified Nonaccrual Loans \| Purchased credit impaired
Financing Receivable, Credit Quality Indicator [Line Items]
Total		$ 0