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Loans - Recorded Investment by Loan Grade (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | $ 5,692,132 | $ 5,372,483 | $ 5,271,857
Five Rated [Member] | Commercial, financial and agricultural |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 11,509 | 17,272 |
Five Rated [Member] | Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,707 | 5,322 |
Five Rated [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,560 | 278 |
Five Rated [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 272 | 216 |
Five Rated [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 16,048 | 23,088 |
Six Rated [Member] | Commercial, financial and agricultural |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 444 | 153 |
Six Rated [Member] | Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans |  | 457 |
Six Rated [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 41 | 1 |
Six Rated [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 485 | 611 |
Impaired [Member] | Commercial, financial and agricultural |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 15,194 | 18,064 |
Impaired [Member] | Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 28,426 | 18,142 |
Impaired [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,866 | 1,324 |
Impaired [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,732 | 19,059 |
Impaired [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 48,218 | 56,589 |
Purchased credit impaired [Member] | Commercial Financial Agricultural [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 148 |  |
Purchased credit impaired [Member] | Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 3,059 |  |
Purchased credit impaired [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 503 |  |
Purchased credit impaired [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 251 |  |
Purchased credit impaired [Member] | Leases |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 0 | 0 |
Purchased credit impaired [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 3,961 |  |
Pass [Member] | Commercial, financial and agricultural |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,050,094 | 1,022,377 |
Pass [Member] | Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,253,603 | 1,147,969 |
Pass [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 172,172 | 124,188 |
Pass [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 427,584 | 374,847 |
Pass [Member] | Leases |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,299 | 3,029 |
Pass [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,905,752 | 2,672,410 |
Recorded Investment [Member] | Commercial, financial and agricultural |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,077,389 | 1,057,866 |
Recorded Investment [Member] | Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,287,795 | 1,171,890 |
Recorded Investment [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 176,101 | 125,790 |
Recorded Investment [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 430,880 | 394,123 |
Recorded Investment [Member] | Leases |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,299 | 3,029 |
Recorded Investment [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | $ 2,974,464 | $ 2,752,698 |

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