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Purchased Loans - Aging of Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | $ 9,693,463 | $ 9,086,256
Unearned income | (3,825) | (3,127)
Loans, net of unearned income | 9,689,638 | 9,083,129
Commercial, financial, agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,367,972 | 1,295,912
Loans, net of unearned income | 1,367,972 | 1,295,912
Lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 85,700 | 64,992
Real estate – construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 826,483 | 740,668
Loans, net of unearned income | 826,483 | 740,668
Real estate – 1-4 family mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 2,866,613 | 2,795,343
Loans, net of unearned income | 2,866,613 | 2,795,343
Real estate – commercial mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 4,244,265 | 4,051,509
Loans, net of unearned income | 4,244,265 | 4,051,509
Installment loans to individuals |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 302,430 | 137,832
Loans, net of unearned income | 384,305 | 199,697
Purchased |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 2,101,664 | 2,693,417
Unearned income | 0 | 0
Loans, net of unearned income | 2,101,664 | 2,693,417
Purchased | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 2,075,422 | 2,661,269
Unearned income | 0 | 0
Loans, net of unearned income | 2,094,626 | 2,687,581
Purchased | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 14,887 | 19,080
Unearned income | 0 | 0
Purchased | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 4,317 | 7,232
Unearned income | 0 | 0
Purchased | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 2,250 | 1,849
Unearned income | 0 | 0
Loans, net of unearned income | 7,038 | 5,836
Purchased | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 606 | 204
Unearned income | 0 | 0
Purchased | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 4,182 | 3,783
Unearned income | 0 | 0
Purchased | Commercial, financial, agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 315,619 | 420,263
Purchased | Commercial, financial, agricultural | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 311,218 | 417,786
Total loans, gross | 314,105 | 419,694
Purchased | Commercial, financial, agricultural | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 1,889 | 1,811
Purchased | Commercial, financial, agricultural | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 998 | 97
Purchased | Commercial, financial, agricultural | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 268 | 92
Total loans, gross | 1,514 | 569
Purchased | Commercial, financial, agricultural | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Purchased | Commercial, financial, agricultural | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 1,246 | 477
Purchased | Lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 0 | 0
Purchased | Lease financing | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 0 | 0
Total loans, gross | 0 | 0
Purchased | Lease financing | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Purchased | Lease financing | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Purchased | Lease financing | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 0 | 0
Total loans, gross | 0 | 0
Purchased | Lease financing | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Purchased | Lease financing | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Purchased | Real estate – construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 51,582 | 105,149
Purchased | Real estate – construction | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 51,263 | 103,846
Total loans, gross | 51,582 | 105,149
Purchased | Real estate – construction | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 319 | 1,235
Purchased | Real estate – construction | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 68
Purchased | Real estate – construction | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 0 | 0
Total loans, gross | 0 | 0
Purchased | Real estate – construction | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Purchased | Real estate – construction | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Purchased | Real estate – 1-4 family mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 516,487 | 707,453
Purchased | Real estate – 1-4 family mortgage | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 503,826 | 690,697
Total loans, gross | 511,586 | 704,133
Purchased | Real estate – 1-4 family mortgage | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 5,516 | 8,981
Purchased | Real estate – 1-4 family mortgage | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 2,244 | 4,455
Purchased | Real estate – 1-4 family mortgage | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 1,534 | 1,237
Total loans, gross | 4,901 | 3,320
Purchased | Real estate – 1-4 family mortgage | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 605 | 202
Purchased | Real estate – 1-4 family mortgage | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 2,762 | 1,881
Purchased | Real estate – commercial mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,115,389 | 1,423,144
Purchased | Real estate – commercial mortgage | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 1,110,570 | 1,413,346
Total loans, gross | 1,114,946 | 1,421,467
Purchased | Real estate – commercial mortgage | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 3,454 | 5,711
Purchased | Real estate – commercial mortgage | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 922 | 2,410
Purchased | Real estate – commercial mortgage | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 320 | 276
Total loans, gross | 443 | 1,677
Purchased | Real estate – commercial mortgage | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Purchased | Real estate – commercial mortgage | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 123 | 1,401
Purchased | Installment loans to individuals |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 102,587 | 37,408
Purchased | Installment loans to individuals | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 98,545 | 35,594
Total loans, gross | 102,407 | 37,138
Purchased | Installment loans to individuals | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 3,709 | 1,342
Purchased | Installment loans to individuals | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 153 | 202
Purchased | Installment loans to individuals | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 128 | 244
Total loans, gross | 180 | 270
Purchased | Installment loans to individuals | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 1 | 2
Purchased | Installment loans to individuals | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | $ 51 | $ 24

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