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Loans - Average Recorded Investment and Interest Income Recognized on Loans Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | $ 70,426 | $ 80,664 | $ 73,712
Average recorded investment | 79,496 | 70,762 | 92,614
Interest income recognized | 4,777 | 1,963 | 2,678
Commercial, financial and agricultural |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 20,624 | 30,595 | 19,106
Average recorded investment | 26,821 | 20,179 | 19,518
Interest income recognized | 885 | 340 | 360
Commercial real estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 24,474 | 18,025 | 21,989
Average recorded investment | 22,828 | 17,883 | 31,945
Interest income recognized | 884 | 550 | 1,027
SEPH commercial land and development |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment |  | 2,044 | 2,078
Average recorded investment | 1,597 | 2,066 | 3,658
Interest income recognized |  | 21 | 146
Remaining commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 2,226 | 4,676 | 5,609
Average recorded investment | 3,906 | 5,666 | 8,784
Interest income recognized | 66 | 26 | 61
Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 23,102 | 25,324 | 24,930
Average recorded investment | 24,341 | 24,968 | 28,306
Interest income recognized | 2,942 | $ 1,026 | 1,084
Consumer |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average recorded investment | $ 3 |  | $ 403

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524 + Details
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