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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | $ 48,144 | $ 56,564 | $ 70,426
Average recorded investment | 51,041 | 67,070 | 79,496
Interest income recognized | 1,890 | 2,708 | 4,777
Commercial, financial and agricultural |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 15,120 | 18,039 | 20,624
Average recorded investment | 21,000 | 23,154 | 26,821
Interest income recognized | 695 | 963 | 885
Commercial real estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 28,426 | 18,142 | 24,474
Average recorded investment | 23,024 | 21,692 | 22,828
Interest income recognized | 1,047 | 903 | 884
Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 1,866 | 1,324 | 2,226
Average recorded investment | 1,709 | 1,729 | 5,503
Interest income recognized | 34 | 64 | 66
Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 2,732 | 19,059 | 23,102
Average recorded investment | 5,308 | 20,490 | 24,341
Interest income recognized | $ 114 | 778 | 2,942
Consumer |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average recorded investment |  | $ 5 | $ 3

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