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Purchased Loans - Aging of Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Past due and nonaccrual loans |  |
Loans, net of unearned income | $ 9,313,784 | $ 9,083,129
Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 1,328,560 | 1,295,912
Real estate – construction |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 816,695 | 740,668
Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 2,797,633 | 2,795,343
Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 4,022,375 | 4,051,509
Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 348,521 | 199,697
Purchased loans |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 2,281,966 | 2,693,417
Purchased loans | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 2,252,340 | 2,661,269
Loans, net of unearned income | 2,275,843 | 2,687,581
Purchased loans | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 16,469 | 19,080
Purchased loans | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 7,034 | 7,232
Purchased loans | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 2,435 | 1,849
Loans, net of unearned income | 6,123 | 5,836
Purchased loans | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 357 | 204
Purchased loans | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 3,331 | 3,783
Purchased loans | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 339,693 | 420,263
Purchased loans | Commercial, financial, agricultural | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 334,410 | 417,786
Loans, net of unearned income | 338,219 | 419,694
Purchased loans | Commercial, financial, agricultural | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 2,133 | 1,811
Purchased loans | Commercial, financial, agricultural | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 1,676 | 97
Purchased loans | Commercial, financial, agricultural | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 290 | 92
Loans, net of unearned income | 1,474 | 569
Purchased loans | Commercial, financial, agricultural | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 0
Purchased loans | Commercial, financial, agricultural | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 1,184 | 477
Purchased loans | Real estate – construction |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 52,106 | 105,149
Purchased loans | Real estate – construction | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 51,731 | 103,846
Loans, net of unearned income | 52,106 | 105,149
Purchased loans | Real estate – construction | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 375 | 1,235
Purchased loans | Real estate – construction | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 68
Purchased loans | Real estate – construction | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 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 |  |
Loans past due | 0 | 0
Purchased loans | Real estate – construction | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 0
Purchased loans | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 561,725 | 707,453
Purchased loans | Real estate – 1-4 family mortgage | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 549,220 | 690,697
Loans, net of unearned income | 557,992 | 704,133
Purchased loans | Real estate – 1-4 family mortgage | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 5,829 | 8,981
Purchased loans | Real estate – 1-4 family mortgage | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 2,943 | 4,455
Purchased loans | Real estate – 1-4 family mortgage | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 1,548 | 1,237
Loans, net of unearned income | 3,733 | 3,320
Purchased loans | Real estate – 1-4 family mortgage | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 333 | 202
Purchased loans | Real estate – 1-4 family mortgage | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 1,852 | 1,881
Purchased loans | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 1,212,905 | 1,423,144
Purchased loans | Real estate – commercial mortgage | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 1,206,299 | 1,413,346
Loans, net of unearned income | 1,212,318 | 1,421,467
Purchased loans | Real estate – commercial mortgage | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 3,674 | 5,711
Purchased loans | Real estate – commercial mortgage | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 2,345 | 2,410
Purchased loans | Real estate – commercial mortgage | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 333 | 276
Loans, net of unearned income | 587 | 1,677
Purchased loans | Real estate – commercial mortgage | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 0
Purchased loans | Real estate – commercial mortgage | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 254 | 1,401
Purchased loans | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 115,537 | 37,408
Purchased loans | Installment loans to individuals | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 110,680 | 35,594
Loans, net of unearned income | 115,208 | 37,138
Purchased loans | Installment loans to individuals | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 4,458 | 1,342
Purchased loans | Installment loans to individuals | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 70 | 202
Purchased loans | Installment loans to individuals | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 264 | 244
Loans, net of unearned income | 329 | 270
Purchased loans | Installment loans to individuals | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 24 | 2
Purchased loans | Installment loans to individuals | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | $ 41 | $ 24

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