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Allowance for Credit Losses - Recorded Investments in Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated for impairment | $ 44,350 | $ 51,179
Collectively evaluated for impairment | 10,889,297 | 9,466,195
Loans, net of unearned income | 10,933,647 | 9,689,638
Receivables Acquired with Deteriorated Credit Quality |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans, net of unearned income |  | 172,264
Commercial, financial, agriculture |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated for impairment | 16,091 | 8,460
Collectively evaluated for impairment | 2,520,893 | 1,329,974
Loans, net of unearned income | 2,536,984 | 1,367,972
Commercial, financial, agriculture | Receivables Acquired with Deteriorated Credit Quality |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans, net of unearned income |  | 29,538
Real estate - construction |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated for impairment | 497 | 12,416
Collectively evaluated for impairment | 857,607 | 813,204
Loans, net of unearned income | 858,104 | 826,483
Real estate - construction | Receivables Acquired with Deteriorated Credit Quality |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans, net of unearned income |  | 863
Real estate - 1-4 family mortgage |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated for impairment | 5,379 | 20,262
Collectively evaluated for impairment | 2,692,929 | 2,810,808
Loans, net of unearned income | 2,698,308 | 2,866,613
Real estate - 1-4 family mortgage | Receivables Acquired with Deteriorated Credit Quality |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans, net of unearned income |  | 35,543
Real estate - commercial mortgage |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated for impairment | 21,764 | 9,550
Collectively evaluated for impairment | 4,533,088 | 4,131,582
Loans, net of unearned income | 4,554,852 | 4,244,265
Real estate - commercial mortgage | Receivables Acquired with Deteriorated Credit Quality |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans, net of unearned income |  | 103,133
Installment and Other |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually evaluated for impairment | 619 | 491
Collectively evaluated for impairment | 208,918 | 380,627
Loans, net of unearned income | $ 209,537 | 384,305
Installment and Other | Receivables Acquired with Deteriorated Credit Quality |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans, net of unearned income |  | $ 3,187

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