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Purchased Loans - Aging of Past Due and Nonaccrual 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
Commercial, financial, agriculture |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 2,536,984 | 1,367,972
Real estate - construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 858,104 | 826,483
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 - commercial mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 4,554,852 | 4,244,265
Installment loans to individuals |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 209,537 | 384,305
Purchased |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 1,514,107 | 2,101,664
Purchased | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 1,474,138 | 2,075,422
Loans, net of unearned income | 1,483,056 | 2,094,626
Purchased | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 8,651 | 14,887
Purchased | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 267 | 4,317
Purchased | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 15,412 | 2,250
Loans, net of unearned income | 31,051 | 7,038
Purchased | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 8,671 | 606
Purchased | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 6,968 | 4,182
Purchased | Commercial, financial, agriculture |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 176,513 | 315,619
Purchased | Commercial, financial, agriculture | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 163,658 | 311,218
Loans, net of unearned income | 164,577 | 314,105
Purchased | Commercial, financial, agriculture | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 818 | 1,889
Purchased | Commercial, financial, agriculture | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 101 | 998
Purchased | Commercial, financial, agriculture | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 9,838 | 268
Loans, net of unearned income | 11,936 | 1,514
Purchased | Commercial, financial, agriculture | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 74 | 0
Purchased | Commercial, financial, agriculture | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 2,024 | 1,246
Purchased | Real estate - construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 30,952 | 51,582
Purchased | Real estate - construction | Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 2,859 | 16,407
Purchased | Real estate - construction | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 28,093 | 35,175
Purchased | Real estate - construction | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 30,952 | 51,263
Loans, net of unearned income | 30,952 | 51,582
Purchased | Real estate - construction | Accruing Loans | Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 2,859 |
Loans, net of unearned income | 2,859 |
Purchased | Real estate - construction | Accruing Loans | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 28,093 |
Loans, net of unearned income | 28,093 |
Purchased | Real estate - construction | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 | 319
Purchased | Real estate - construction | Accruing Loans | 30-89 Days Past Due | Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 |
Purchased | Real estate - construction | Accruing Loans | 30-89 Days Past Due | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 |
Purchased | Real estate - construction | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 | 0
Purchased | Real estate - construction | Accruing Loans | 90 Days or More Past Due | Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 |
Purchased | Real estate - construction | Accruing Loans | 90 Days or More Past Due | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 |
Purchased | Real estate - construction | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 0 | 0
Loans, net of unearned income | 0 | 0
Purchased | Real estate - construction | Nonaccruing Loans | Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 0 |
Loans, net of unearned income | 0 |
Purchased | Real estate - construction | Nonaccruing Loans | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 0 |
Loans, net of unearned income | 0 |
Purchased | Real estate - construction | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 | 0
Purchased | Real estate - construction | Nonaccruing Loans | 30-89 Days Past Due | Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 |
Purchased | Real estate - construction | Nonaccruing Loans | 30-89 Days Past Due | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 |
Purchased | Real estate - construction | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 | 0
Purchased | Real estate - construction | Nonaccruing Loans | 90 Days or More Past Due | Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 |
Purchased | Real estate - construction | Nonaccruing Loans | 90 Days or More Past Due | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 |
Purchased | Real estate - 1-4 family mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 341,744 | 516,487
Purchased | Real estate - 1-4 family mortgage | Primary |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 214,770 | 332,729
Purchased | Real estate - 1-4 family mortgage | Home Equity Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 80,392 | 117,275
Purchased | Real estate - 1-4 family mortgage | Rental / Investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 31,928 | 43,169
Purchased | Real estate - 1-4 family mortgage | Land Development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 14,654 | 23,314
Purchased | Real estate - 1-4 family mortgage | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 330,536 | 503,826
Loans, net of unearned income | 333,644 | 511,586
Purchased | Real estate - 1-4 family mortgage | Accruing Loans | Primary |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 206,635 |
Loans, net of unearned income | 209,103 |
Purchased | Real estate - 1-4 family mortgage | Accruing Loans | Home Equity Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 78,739 |
Loans, net of unearned income | 79,076 |
Purchased | Real estate - 1-4 family mortgage | Accruing Loans | Rental / Investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 30,931 |
Loans, net of unearned income | 31,125 |
Purchased | Real estate - 1-4 family mortgage | Accruing Loans | Land Development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 14,231 |
Loans, net of unearned income | 14,340 |
Purchased | Real estate - 1-4 family mortgage | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 2,977 | 5,516
Purchased | Real estate - 1-4 family mortgage | Accruing Loans | 30-89 Days Past Due | Primary |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 2,394 |
Purchased | Real estate - 1-4 family mortgage | Accruing Loans | 30-89 Days Past Due | Home Equity Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 294 |
Purchased | Real estate - 1-4 family mortgage | Accruing Loans | 30-89 Days Past Due | Rental / Investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 180 |
Purchased | Real estate - 1-4 family mortgage | Accruing Loans | 30-89 Days Past Due | Land Development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 109 |
Purchased | Real estate - 1-4 family mortgage | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 131 | 2,244
Purchased | Real estate - 1-4 family mortgage | Accruing Loans | 90 Days or More Past Due | Primary |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 74 |
Purchased | Real estate - 1-4 family mortgage | Accruing Loans | 90 Days or More Past Due | Home Equity Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 43 |
Purchased | Real estate - 1-4 family mortgage | Accruing Loans | 90 Days or More Past Due | Rental / Investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 14 |
Purchased | Real estate - 1-4 family mortgage | Accruing Loans | 90 Days or More Past Due | Land Development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 |
Purchased | Real estate - 1-4 family mortgage | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 3,212 | 1,534
Loans, net of unearned income | 8,100 | 4,901
Purchased | Real estate - 1-4 family mortgage | Nonaccruing Loans | Primary |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 2,181 |
Loans, net of unearned income | 5,667 |
Purchased | Real estate - 1-4 family mortgage | Nonaccruing Loans | Home Equity Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 638 |
Loans, net of unearned income | 1,316 |
Purchased | Real estate - 1-4 family mortgage | Nonaccruing Loans | Rental / Investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 79 |
Loans, net of unearned income | 803 |
Purchased | Real estate - 1-4 family mortgage | Nonaccruing Loans | Land Development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 314 |
Loans, net of unearned income | 314 |
Purchased | Real estate - 1-4 family mortgage | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 691 | 605
Purchased | Real estate - 1-4 family mortgage | Nonaccruing Loans | 30-89 Days Past Due | Primary |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 687 |
Purchased | Real estate - 1-4 family mortgage | Nonaccruing Loans | 30-89 Days Past Due | Home Equity Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 4 |
Purchased | Real estate - 1-4 family mortgage | Nonaccruing Loans | 30-89 Days Past Due | Rental / Investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 |
Purchased | Real estate - 1-4 family mortgage | Nonaccruing Loans | 30-89 Days Past Due | Land Development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 |
Purchased | Real estate - 1-4 family mortgage | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 4,197 | 2,762
Purchased | Real estate - 1-4 family mortgage | Nonaccruing Loans | 90 Days or More Past Due | Primary |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 2,799 |
Purchased | Real estate - 1-4 family mortgage | Nonaccruing Loans | 90 Days or More Past Due | Home Equity Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 674 |
Purchased | Real estate - 1-4 family mortgage | Nonaccruing Loans | 90 Days or More Past Due | Rental / Investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 724 |
Purchased | Real estate - 1-4 family mortgage | Nonaccruing Loans | 90 Days or More Past Due | Land Development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 |
Purchased | Real estate - commercial mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 905,223 | 1,115,389
Purchased | Real estate - commercial mortgage | Land Development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 29,454 |
Purchased | Real estate - commercial mortgage | Owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 323,041 | 428,077
Purchased | Real estate - commercial mortgage | Non-owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 552,728 | 647,308
Purchased | Real estate - commercial mortgage | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 891,653 | 1,110,570
Loans, net of unearned income | 894,483 | 1,114,946
Purchased | Real estate - commercial mortgage | Accruing Loans | Land Development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 28,962 |
Loans, net of unearned income | 29,074 |
Purchased | Real estate - commercial mortgage | Accruing Loans | Owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 317,997 |
Loans, net of unearned income | 320,508 |
Purchased | Real estate - commercial mortgage | Accruing Loans | Non-owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 544,694 |
Loans, net of unearned income | 544,901 |
Purchased | Real estate - commercial mortgage | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 2,830 | 3,454
Purchased | Real estate - commercial mortgage | Accruing Loans | 30-89 Days Past Due | Land Development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 112 |
Purchased | Real estate - commercial mortgage | Accruing Loans | 30-89 Days Past Due | Owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 2,511 |
Purchased | Real estate - commercial mortgage | Accruing Loans | 30-89 Days Past Due | Non-owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 207 |
Purchased | Real estate - commercial mortgage | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 | 922
Purchased | Real estate - commercial mortgage | Accruing Loans | 90 Days or More Past Due | Land Development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 |
Purchased | Real estate - commercial mortgage | Accruing Loans | 90 Days or More Past Due | Owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 |
Purchased | Real estate - commercial mortgage | Accruing Loans | 90 Days or More Past Due | Non-owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 |
Purchased | Real estate - commercial mortgage | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 2,254 | 320
Loans, net of unearned income | 10,740 | 443
Purchased | Real estate - commercial mortgage | Nonaccruing Loans | Land Development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 216 |
Loans, net of unearned income | 380 |
Purchased | Real estate - commercial mortgage | Nonaccruing Loans | Owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 1,893 |
Loans, net of unearned income | 2,533 |
Purchased | Real estate - commercial mortgage | Nonaccruing Loans | Non-owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 145 |
Loans, net of unearned income | 7,827 |
Purchased | Real estate - commercial mortgage | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 7,875 | 0
Purchased | Real estate - commercial mortgage | Nonaccruing Loans | 30-89 Days Past Due | Land Development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 |
Purchased | Real estate - commercial mortgage | Nonaccruing Loans | 30-89 Days Past Due | Owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 193 |
Purchased | Real estate - commercial mortgage | Nonaccruing Loans | 30-89 Days Past Due | Non-owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 7,682 |
Purchased | Real estate - commercial mortgage | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 611 | 123
Purchased | Real estate - commercial mortgage | Nonaccruing Loans | 90 Days or More Past Due | Land Development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 164 |
Purchased | Real estate - commercial mortgage | Nonaccruing Loans | 90 Days or More Past Due | Owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 447 |
Purchased | Real estate - commercial mortgage | Nonaccruing Loans | 90 Days or More Past Due | Non-owner Occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 0 |
Purchased | Installment loans to individuals |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 59,675 | 102,587
Purchased | Installment loans to individuals | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 57,339 | 98,545
Loans, net of unearned income | 59,400 | 102,407
Purchased | Installment loans to individuals | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 2,026 | 3,709
Purchased | Installment loans to individuals | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 35 | 153
Purchased | Installment loans to individuals | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current loans | 108 | 128
Loans, net of unearned income | 275 | 180
Purchased | Installment loans to individuals | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | 31 | 1
Purchased | Installment loans to individuals | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due, gross | $ 136 | $ 51

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