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Purchased Loans - Aging of Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Past due and nonaccrual loans |  |
Loans, net of unearned income | $ 11,084,738 | $ 9,689,638
Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 2,648,062 | 1,367,972
Real estate – construction: |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 773,119 | 826,483
Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 2,760,394 | 2,866,613
Real estate – commercial mortgage: |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 4,577,009 | 4,244,265
Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 243,226 | 384,305
Purchased loans |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 1,660,514 | 2,101,664
Purchased loans | Accruing loans |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 1,635,693 | 2,094,626
Current Loans | 1,628,985 | 2,075,422
Purchased loans | Accruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 6,390 | 14,887
Purchased loans | Accruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 318 | 4,317
Purchased loans | Nonaccruing loans |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 24,821 | 7,038
Current Loans | 10,037 | 2,250
Purchased loans | Nonaccruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 2,642 | 606
Purchased loans | Nonaccruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 12,142 | 4,182
Purchased loans | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 202,768 | 315,619
Purchased loans | Commercial, financial, agricultural | Accruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 189,668 | 311,218
Loans, net of unearned income | 190,760 | 314,105
Purchased loans | Commercial, financial, agricultural | Accruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 1,056 | 1,889
Purchased loans | Commercial, financial, agricultural | Accruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 36 | 998
Purchased loans | Commercial, financial, agricultural | Nonaccruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 4,120 | 268
Loans, net of unearned income | 12,008 | 1,514
Purchased loans | Commercial, financial, agricultural | Nonaccruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 1,655 | 0
Purchased loans | Commercial, financial, agricultural | Nonaccruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 6,233 | 1,246
Purchased loans | Real estate – construction: |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 34,246 | 51,582
Purchased loans | Real estate – construction: | Accruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 34,246 | 51,263
Loans, net of unearned income | 34,246 | 51,582
Purchased loans | Real estate – construction: | Accruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 0 | 319
Purchased loans | Real estate – construction: | Accruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 0 | 0
Purchased loans | Real estate – construction: | Nonaccruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 0 | 0
Loans, net of unearned income | 0 | 0
Purchased loans | Real estate – construction: | Nonaccruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 0 | 0
Purchased loans | Real estate – construction: | Nonaccruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 0 | 0
Purchased loans | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 391,102 | 516,487
Purchased loans | Real estate – 1-4 family mortgage | Accruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 380,933 | 503,826
Loans, net of unearned income | 383,151 | 511,586
Purchased loans | Real estate – 1-4 family mortgage | Accruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 2,040 | 5,516
Purchased loans | Real estate – 1-4 family mortgage | Accruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 178 | 2,244
Purchased loans | Real estate – 1-4 family mortgage | Nonaccruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 3,462 | 1,534
Loans, net of unearned income | 7,951 | 4,901
Purchased loans | Real estate – 1-4 family mortgage | Nonaccruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 329 | 605
Purchased loans | Real estate – 1-4 family mortgage | Nonaccruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 4,160 | 2,762
Purchased loans | Real estate – commercial mortgage: |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 966,367 | 1,115,389
Purchased loans | Real estate – commercial mortgage: | Accruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 960,292 | 1,110,570
Loans, net of unearned income | 961,796 | 1,114,946
Purchased loans | Real estate – commercial mortgage: | Accruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 1,450 | 3,454
Purchased loans | Real estate – commercial mortgage: | Accruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 54 | 922
Purchased loans | Real estate – commercial mortgage: | Nonaccruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 2,296 | 320
Loans, net of unearned income | 4,571 | 443
Purchased loans | Real estate – commercial mortgage: | Nonaccruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 649 | 0
Purchased loans | Real estate – commercial mortgage: | Nonaccruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 1,626 | 123
Purchased loans | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 66,031 | 102,587
Purchased loans | Installment loans to individuals | Accruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 63,846 | 98,545
Loans, net of unearned income | 65,740 | 102,407
Purchased loans | Installment loans to individuals | Accruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 1,844 | 3,709
Purchased loans | Installment loans to individuals | Accruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 50 | 153
Purchased loans | Installment loans to individuals | Nonaccruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 159 | 128
Loans, net of unearned income | 291 | 180
Purchased loans | Installment loans to individuals | Nonaccruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 9 | 1
Purchased loans | Installment loans to individuals | Nonaccruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 123 | 51
Purchased loans | Residential | Real estate – construction: |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 3,093 | 16,407
Purchased loans | Residential | Real estate – construction: | Accruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 3,093 |
Loans, net of unearned income | 3,093 |
Purchased loans | Residential | Real estate – construction: | Accruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 0 |
Purchased loans | Residential | Real estate – construction: | Accruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 0 |
Purchased loans | Residential | Real estate – construction: | Nonaccruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 0 |
Loans, net of unearned income | 0 |
Purchased loans | Residential | Real estate – construction: | Nonaccruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 0 |
Purchased loans | Residential | Real estate – construction: | Nonaccruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 0 |
Purchased loans | Commercial | Real estate – construction: |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 31,153 | 35,175
Purchased loans | Commercial | Real estate – construction: | Accruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 31,153 |
Loans, net of unearned income | 31,153 |
Purchased loans | Commercial | Real estate – construction: | Accruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 0 |
Purchased loans | Commercial | Real estate – construction: | Accruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 0 |
Purchased loans | Commercial | Real estate – construction: | Nonaccruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 0 |
Loans, net of unearned income | 0 |
Purchased loans | Commercial | Real estate – construction: | Nonaccruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 0 |
Purchased loans | Commercial | Real estate – construction: | Nonaccruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 0 |
Purchased loans | Primary | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 245,369 | 332,729
Purchased loans | Primary | Real estate – 1-4 family mortgage | Accruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 238,937 |
Loans, net of unearned income | 239,846 |
Purchased loans | Primary | Real estate – 1-4 family mortgage | Accruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 845 |
Purchased loans | Primary | Real estate – 1-4 family mortgage | Accruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 64 |
Purchased loans | Primary | Real estate – 1-4 family mortgage | Nonaccruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 2,400 |
Loans, net of unearned income | 5,523 |
Purchased loans | Primary | Real estate – 1-4 family mortgage | Nonaccruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 329 |
Purchased loans | Primary | Real estate – 1-4 family mortgage | Nonaccruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 2,794 |
Purchased loans | Home equity | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 95,235 | 117,275
Purchased loans | Home equity | Real estate – 1-4 family mortgage | Accruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 93,006 |
Loans, net of unearned income | 93,959 |
Purchased loans | Home equity | Real estate – 1-4 family mortgage | Accruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 839 |
Purchased loans | Home equity | Real estate – 1-4 family mortgage | Accruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 114 |
Purchased loans | Home equity | Real estate – 1-4 family mortgage | Nonaccruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 647 |
Loans, net of unearned income | 1,276 |
Purchased loans | Home equity | Real estate – 1-4 family mortgage | Nonaccruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 0 |
Purchased loans | Home equity | Real estate – 1-4 family mortgage | Nonaccruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 629 |
Purchased loans | Rental/investment | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 33,567 | 43,169
Purchased loans | Rental/investment | Real estate – 1-4 family mortgage | Accruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 32,409 |
Loans, net of unearned income | 32,765 |
Purchased loans | Rental/investment | Real estate – 1-4 family mortgage | Accruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 356 |
Purchased loans | Rental/investment | Real estate – 1-4 family mortgage | Accruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 0 |
Purchased loans | Rental/investment | Real estate – 1-4 family mortgage | Nonaccruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 94 |
Loans, net of unearned income | 802 |
Purchased loans | Rental/investment | Real estate – 1-4 family mortgage | Nonaccruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 0 |
Purchased loans | Rental/investment | Real estate – 1-4 family mortgage | Nonaccruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 708 |
Purchased loans | Land development | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 16,931 | 23,314
Purchased loans | Land development | Real estate – 1-4 family mortgage | Accruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 16,581 |
Loans, net of unearned income | 16,581 |
Purchased loans | Land development | Real estate – 1-4 family mortgage | Accruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 0 |
Purchased loans | Land development | Real estate – 1-4 family mortgage | Accruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 0 |
Purchased loans | Land development | Real estate – 1-4 family mortgage | Nonaccruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 321 |
Loans, net of unearned income | 350 |
Purchased loans | Land development | Real estate – 1-4 family mortgage | Nonaccruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 0 |
Purchased loans | Land development | Real estate – 1-4 family mortgage | Nonaccruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 29 |
Purchased loans | Land development | Real estate – commercial mortgage: |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 32,694 |
Purchased loans | Land development | Real estate – commercial mortgage: | Accruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 32,142 |
Loans, net of unearned income | 32,303 |
Purchased loans | Land development | Real estate – commercial mortgage: | Accruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 161 |
Purchased loans | Land development | Real estate – commercial mortgage: | Accruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 0 |
Purchased loans | Land development | Real estate – commercial mortgage: | Nonaccruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 227 |
Loans, net of unearned income | 391 |
Purchased loans | Land development | Real estate – commercial mortgage: | Nonaccruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 0 |
Purchased loans | Land development | Real estate – commercial mortgage: | Nonaccruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 164 |
Purchased loans | Owner-occupied | Real estate – commercial mortgage: |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 355,994 | 428,077
Purchased loans | Owner-occupied | Real estate – commercial mortgage: | Accruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 351,688 |
Loans, net of unearned income | 352,539 |
Purchased loans | Owner-occupied | Real estate – commercial mortgage: | Accruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 851 |
Purchased loans | Owner-occupied | Real estate – commercial mortgage: | Accruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 0 |
Purchased loans | Owner-occupied | Real estate – commercial mortgage: | Nonaccruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 2,059 |
Loans, net of unearned income | 3,455 |
Purchased loans | Owner-occupied | Real estate – commercial mortgage: | Nonaccruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 505 |
Purchased loans | Owner-occupied | Real estate – commercial mortgage: | Nonaccruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 891 |
Purchased loans | Non-owner occupied | Real estate – commercial mortgage: |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 577,679 | $ 647,308
Purchased loans | Non-owner occupied | Real estate – commercial mortgage: | Accruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 576,462 |
Loans, net of unearned income | 576,954 |
Purchased loans | Non-owner occupied | Real estate – commercial mortgage: | Accruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 438 |
Purchased loans | Non-owner occupied | Real estate – commercial mortgage: | Accruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 54 |
Purchased loans | Non-owner occupied | Real estate – commercial mortgage: | Nonaccruing loans |  |
Past due and nonaccrual loans |  |
Current, gross | 10 |
Loans, net of unearned income | 725 |
Purchased loans | Non-owner occupied | Real estate – commercial mortgage: | Nonaccruing loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | 144 |
Purchased loans | Non-owner occupied | Real estate – commercial mortgage: | Nonaccruing loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Past due, gross | $ 571 |

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