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Loans and Asset Quality Information (Schedule of Recorded Investment in Loans by Credit Quality Indicators) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Recorded investment in loans by credit quality indicators: |  |  |
Total | $ 4,190,139 | $ 4,043,355 |
Unamortized net deferred loan costs | 489 | (986) | $ (437)
Total loans | 4,190,628 | 4,042,369 | $ 3,429,755
Pass [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 4,075,835 | 3,891,038 |
Special Mention Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 44,470 | 72,915 |
Classified Accruing Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 51,567 | 58,434 |
Classified Nonaccrual Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 18,267 | 20,968 |
Commercial, financial, and agricultural [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 435,466 | 380,482 |
Commercial, financial, and agricultural [Member] | Pass [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 429,721 | 368,658 |
Commercial, financial, and agricultural [Member] | Special Mention Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 2,797 | 9,901 |
Commercial, financial, and agricultural [Member] | Classified Accruing Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 856 | 922 |
Commercial, financial, and agricultural [Member] | Classified Nonaccrual Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 2,092 | 1,001 |
Real estate construction, land development & other land loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 558,925 | 538,613 |
Real estate construction, land development & other land loans [Member] | Pass [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 547,323 | 523,642 |
Real estate construction, land development & other land loans [Member] | Special Mention Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 6,331 | 7,129 |
Real estate construction, land development & other land loans [Member] | Classified Accruing Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 4,620 | 6,020 |
Real estate construction, land development & other land loans [Member] | Classified Nonaccrual Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 651 | 1,822 |
Real estate - mortgage - residential (1-4 family) first mortgages [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 1,032,261 | 963,913 |
Real estate - mortgage - residential (1-4 family) first mortgages [Member] | Pass [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 984,851 | 905,111 |
Real estate - mortgage - residential (1-4 family) first mortgages [Member] | Special Mention Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 13,052 | 16,235 |
Real estate - mortgage - residential (1-4 family) first mortgages [Member] | Classified Accruing Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 25,551 | 30,366 |
Real estate - mortgage - residential (1-4 family) first mortgages [Member] | Classified Nonaccrual Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 8,807 | 12,201 |
Real estate mortgage home equity loans / lines of credit [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 362,484 | 379,695 |
Real estate mortgage home equity loans / lines of credit [Member] | Pass [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 351,575 | 365,982 |
Real estate mortgage home equity loans / lines of credit [Member] | Special Mention Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 1,697 | 3,784 |
Real estate mortgage home equity loans / lines of credit [Member] | Classified Accruing Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 7,793 | 7,405 |
Real estate mortgage home equity loans / lines of credit [Member] | Classified Nonaccrual Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 1,419 | 2,524 |
Real estate mortgage commercial and other [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 1,711,010 | 1,683,595 |
Real estate mortgage commercial and other [Member] | Pass [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 1,684,024 | 1,647,725 |
Real estate mortgage commercial and other [Member] | Special Mention Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 15,075 | 23,355 |
Real estate mortgage commercial and other [Member] | Classified Accruing Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 6,733 | 9,190 |
Real estate mortgage commercial and other [Member] | Classified Nonaccrual Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 5,178 | 3,345 |
Installment loans to individuals [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 69,804 | 73,892 |
Installment loans to individuals [Member] | Pass [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 69,072 | 73,379 |
Installment loans to individuals [Member] | Special Mention Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 212 | 222 |
Installment loans to individuals [Member] | Classified Accruing Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 400 | 216 |
Installment loans to individuals [Member] | Classified Nonaccrual Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 120 | 75 |
Purchased credit impaired [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 20,189 | 23,165 |
Purchased credit impaired [Member] | Pass [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 9,269 | 6,541 |
Purchased credit impaired [Member] | Special Mention Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 5,306 | 12,309 |
Purchased credit impaired [Member] | Classified Accruing Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total | 5,614 | 4,315 |
Purchased credit impaired [Member] | Classified Nonaccrual Loans [Member] |  |  |
Recorded investment in loans by credit quality indicators: |  |  |
Total |  |  |

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