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Purchased Loans - Summary of Purchased Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | $ 10,933,647 | $ 9,689,638
Purchased |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 1,514,107 | 2,101,664
Commercial, financial, agriculture |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 2,536,984 | 1,367,972
Commercial, financial, agriculture | Purchased |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 176,513 | 315,619
Real estate - construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 858,104 | 826,483
Real estate - construction | Purchased |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 30,952 | 51,582
Real estate - construction | Purchased | Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 2,859 | 16,407
Real estate - construction | Purchased | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 28,093 | 35,175
Real estate - 1-4 family mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 2,698,308 | 2,866,613
Real estate - 1-4 family mortgage | Purchased |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 341,744 | 516,487
Real estate - 1-4 family mortgage | Purchased | Primary |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 214,770 | 332,729
Real estate - 1-4 family mortgage | Purchased | Home Equity Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 80,392 | 117,275
Real estate - 1-4 family mortgage | Purchased | Rental / Investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 31,928 | 43,169
Real estate - 1-4 family mortgage | Purchased | Land Development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 14,654 | 23,314
Real estate - commercial mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 4,554,852 | 4,244,265
Real estate - commercial mortgage | Purchased |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 905,223 | 1,115,389
Real estate - commercial mortgage | Purchased | Land Development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 29,454 |
Real estate - commercial mortgage | Purchased | Owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 323,041 | 428,077
Real estate - commercial mortgage | Purchased | Non-owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 552,728 | 647,308
Real estate - commercial mortgage | Purchased | Land Development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 29,454 | 40,004
Installment loans to individuals |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 209,537 | 384,305
Installment loans to individuals | Purchased |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | $ 59,675 | $ 102,587

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