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Purchased Loans - Purchased With Deteriorated Credit (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans, net | $ 10,757,503 | $ 9,637,476
Purchased | Receivables Acquired with Deteriorated Credit Quality |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans, net |  | 172,264
Purchased | Receivables Acquired with Deteriorated Credit Quality | Commercial, financial, agriculture |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans, net |  | 29,538
Purchased | Receivables Acquired with Deteriorated Credit Quality | Real estate - construction |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans, net |  | 863
Purchased | Receivables Acquired with Deteriorated Credit Quality | Real estate - 1-4 family mortgage |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans, net |  | 35,543
Purchased | Receivables Acquired with Deteriorated Credit Quality | Real estate - commercial mortgage |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans, net |  | 103,133
Purchased | Receivables Acquired with Deteriorated Credit Quality | Installment loans to individuals |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans, net |  | $ 3,187

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