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Purchased Loans - Aging of Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Past due and nonaccrual loans |  |
Loans, net of unearned income | $ 9,122,907 | $ 7,620,322
Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 1,313,344 | 1,039,393
Real estate – construction |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 736,985 | 633,389
Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 2,762,683 | 2,343,721
Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 4,112,585 | 3,427,530
Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 197,310 | 176,289
Purchased loans |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 2,912,669 | 2,031,766
Purchased loans | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 2,879,067 | 2,010,852
Loans, net of unearned income | 2,907,860 | 2,027,342
Purchased loans | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 20,833 | 10,759
Purchased loans | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 7,960 | 5,731
Purchased loans | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 1,801 | 2,612
Loans, net of unearned income | 4,809 | 4,424
Purchased loans | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 819 | 635
Purchased loans | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 2,189 | 1,177
Purchased loans | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 495,545 | 275,570
Purchased loans | Commercial, financial, agricultural | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 489,237 | 273,488
Loans, net of unearned income | 495,232 | 275,139
Purchased loans | Commercial, financial, agricultural | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 5,508 | 1,119
Purchased loans | Commercial, financial, agricultural | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 487 | 532
Purchased loans | Commercial, financial, agricultural | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 74 | 232
Loans, net of unearned income | 313 | 431
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 | 239 | 199
Purchased loans | Real estate – construction |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 112,093 | 85,731
Purchased loans | Real estate – construction | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 109,153 | 85,316
Loans, net of unearned income | 111,829 | 85,731
Purchased loans | Real estate – construction | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 2,676 | 415
Purchased loans | Real estate – construction | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 0
Purchased loans | Real estate – construction | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 0 | 0
Loans, net of unearned income | 264 | 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 | 264 | 0
Purchased loans | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 761,913 | 614,187
Purchased loans | Real estate – 1-4 family mortgage | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 748,488 | 602,464
Loans, net of unearned income | 758,873 | 610,814
Purchased loans | Real estate – 1-4 family mortgage | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 6,737 | 6,070
Purchased loans | Real estate – 1-4 family mortgage | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 3,648 | 2,280
Purchased loans | Real estate – 1-4 family mortgage | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 1,330 | 2,109
Loans, net of unearned income | 3,040 | 3,373
Purchased loans | Real estate – 1-4 family mortgage | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 353 | 385
Purchased loans | Real estate – 1-4 family mortgage | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 1,357 | 879
Purchased loans | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 1,503,075 | 1,037,454
Purchased loans | Real estate – commercial mortgage | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 1,493,220 | 1,031,141
Loans, net of unearned income | 1,502,127 | 1,036,998
Purchased loans | Real estate – commercial mortgage | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 5,140 | 2,947
Purchased loans | Real estate – commercial mortgage | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 3,767 | 2,910
Purchased loans | Real estate – commercial mortgage | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 207 | 166
Loans, net of unearned income | 948 | 456
Purchased loans | Real estate – commercial mortgage | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 412 | 191
Purchased loans | Real estate – commercial mortgage | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 329 | 99
Purchased loans | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 40,043 | 18,824
Purchased loans | Installment loans to individuals | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 38,969 | 18,443
Loans, net of unearned income | 39,799 | 18,660
Purchased loans | Installment loans to individuals | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 772 | 208
Purchased loans | Installment loans to individuals | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 58 | 9
Purchased loans | Installment loans to individuals | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 190 | 105
Loans, net of unearned income | 244 | 164
Purchased loans | Installment loans to individuals | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 54 | 59
Purchased loans | Installment loans to individuals | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | $ 0 | $ 0

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