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Loans - Loans Individually Evaluated for Impairment by Class of Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid principal balance | $ 95,358 | $ 109,305 |
Recorded investment | 70,426 | 80,664 | $ 73,712
Allowance for loan losses allocated | 548 | 4,191 |
Impaired Financing Receivable, Average Recorded Investment | 79,496 | 70,762 | 92,614
Impaired Financing Receivable, Interest Income, Cash Basis Method | 4,777 | 1,963 | 2,678
Commercial, financial and agricultural |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 20,624 | 30,595 | 19,106
Impaired Financing Receivable, Average Recorded Investment | 26,821 | 20,179 | 19,518
Impaired Financing Receivable, Interest Income, Cash Basis Method | 885 | 340 | 360
Commercial real estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 24,474 | 18,025 | 21,989
Impaired Financing Receivable, Average Recorded Investment | 22,828 | 17,883 | 31,945
Impaired Financing Receivable, Interest Income, Cash Basis Method | 884 | 550 | 1,027
Remaining commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 2,226 | 4,676 | 5,609
Impaired Financing Receivable, Average Recorded Investment | 3,906 | 5,666 | 8,784
Impaired Financing Receivable, Interest Income, Cash Basis Method | 66 | 26 | 61
Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 23,102 | 25,324 | 24,930
Impaired Financing Receivable, Average Recorded Investment | 24,341 | 24,968 | 28,306
Impaired Financing Receivable, Interest Income, Cash Basis Method | 2,942 | 1,026 | 1,084
Consumer |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 3 |  | 403
Construction Real Estate Vision Commercial Land And Development [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment |  | 2,044 | 2,078
Impaired Financing Receivable, Average Recorded Investment | 1,597 | 2,066 | 3,658
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 21 | $ 146
With no related allowance recorded | Commercial, financial and agricultural |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid principal balance | 41,075 | 32,583 |
Recorded investment | 19,965 | 18,763 |
With no related allowance recorded | Commercial real estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid principal balance | 23,961 | 15,138 |
Recorded investment | 23,474 | 14,916 |
With no related allowance recorded | SEPH commercial land and development |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid principal balance |  | 10,834 |
Recorded investment |  | 2,044 |
With no related allowance recorded | Remaining commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid principal balance | 3,662 | 2,506 |
Recorded investment | 2,226 | 1,531 |
With no related allowance recorded | Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid principal balance | 24,409 | 23,798 |
Recorded investment | $ 22,687 | $ 23,480 |

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