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Loans and Asset Quality Information (Schedule of Nonaccrual Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | --- | ---
Company's nonaccrual loans: |  |  |
Nonaccrual loans | $ 32,796 | $ 47,810 | $ 47,720
Commercial, financial, and agricultural [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 2,253 | 2,964 | 2,852
Real estate construction, land development & other land loans [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 3,858 | 4,704 | 5,434
Real estate mortgage residential (1-4 family) first mortgages [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 17,989 | 23,829 | 25,206
Real estate mortgage home equity loans / lines of credit [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 2,441 | 3,525 | 2,472
Real estate mortgage commercial and other [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 6,151 | 12,571 | 11,398
Installment loans to individuals [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 104 | 217 | 358
Covered [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans |  | 7,816 | 5,373
All Total Loans [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 32,796 | 47,810 | $ 47,720
All Total Loans [Member] | Commercial, financial, and agricultural [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 2,253 | 2,964 |
All Total Loans [Member] | Real estate construction, land development & other land loans [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 3,858 | 4,704 |
All Total Loans [Member] | Real estate mortgage residential (1-4 family) first mortgages [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 17,989 | 23,829 |
All Total Loans [Member] | Real estate mortgage home equity loans / lines of credit [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 2,441 | 3,525 |
All Total Loans [Member] | Real estate mortgage commercial and other [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 6,151 | 12,571 |
All Total Loans [Member] | Installment loans to individuals [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | $ 104 | $ 217 |

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