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Purchased Loans - Loans Purchased with Deteriorated Credit Quality (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding balance of restructured loans | $ 10,916,640 | $ 9,637,476
Purchased with deteriorated credit quality | Purchased loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding balance of restructured loans |  | 172,264
Purchased with deteriorated credit quality | Purchased loans | Commercial, financial, agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding balance of restructured loans |  | 29,538
Purchased with deteriorated credit quality | Purchased loans | Real estate – construction: |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding balance of restructured loans |  | 863
Purchased with deteriorated credit quality | Purchased loans | Real estate – 1-4 family mortgage: |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding balance of restructured loans |  | 35,543
Purchased with deteriorated credit quality | Purchased loans | Real estate – commercial mortgage: |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding balance of restructured loans |  | 103,133
Purchased with deteriorated credit quality | Purchased loans | Installment loans to individuals |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding balance of restructured loans |  | $ 3,187

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