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Purchased Loans - Loan Portfolio by Risk-rating Grades (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 9,689,638 | $ 9,083,129
Commercial, financial, agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 1,367,972 | 1,295,912
Real estate – construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 826,483 | 740,668
Real estate – 1-4 family mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 2,866,613 | 2,795,343
Real estate – commercial mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 4,244,265 | 4,051,509
Installment loans to individuals |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 384,305 | 199,697
Purchased |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 2,101,664 | 2,693,417
Purchased | Internal Noninvestment Grade |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 1,385,653 | 1,852,090
Purchased | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 1,296,372 | 1,746,683
Purchased | Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 64,291 | 84,250
Purchased | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 24,990 | 21,157
Purchased | Commercial, financial, agricultural | Internal Noninvestment Grade |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 272,146 | 369,748
Purchased | Commercial, financial, agricultural | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 259,760 | 333,147
Purchased | Commercial, financial, agricultural | Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 7,166 | 33,857
Purchased | Commercial, financial, agricultural | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 5,220 | 2,744
Purchased | Real estate – construction | Internal Noninvestment Grade |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 48,994 | 101,964
Purchased | Real estate – construction | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 48,994 | 101,122
Purchased | Real estate – construction | Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 0 | 0
Purchased | Real estate – construction | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 0 | 842
Purchased | Real estate – 1-4 family mortgage | Internal Noninvestment Grade |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 82,831 | 128,806
Purchased | Real estate – 1-4 family mortgage | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 78,105 | 113,874
Purchased | Real estate – 1-4 family mortgage | Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 791 | 7,347
Purchased | Real estate – 1-4 family mortgage | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 3,935 | 7,585
Purchased | Real estate – commercial mortgage | Internal Noninvestment Grade |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 981,682 | 1,251,570
Purchased | Real estate – commercial mortgage | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 909,513 | 1,198,540
Purchased | Real estate – commercial mortgage | Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 56,334 | 43,046
Purchased | Real estate – commercial mortgage | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 15,835 | 9,984
Purchased | Installment loans to individuals | Internal Noninvestment Grade |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 0 | 2
Purchased | Installment loans to individuals | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 0 | 0
Purchased | Installment loans to individuals | Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 0 | 0
Purchased | Installment loans to individuals | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 0 | $ 2

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