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Purchased Loans - Aging of Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Past due and nonaccrual loans |  |
Loans, net of unearned income | $ 7,767,657 | $ 7,620,322
Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 987,818 | 1,039,393
Real estate – construction |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 712,818 | 633,389
Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 2,433,099 | 2,343,721
Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 3,461,174 | 3,427,530
Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 172,748 | 176,289
Purchased loans |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 1,709,891 | 2,031,766
Purchased loans | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 1,693,676 | 2,010,852
Loans, net of unearned income | 1,705,330 | 2,027,342
Purchased loans | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 6,163 | 10,759
Purchased loans | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 5,491 | 5,731
Purchased loans | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 2,059 | 2,612
Loans, net of unearned income | 4,561 | 4,424
Purchased loans | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 692 | 635
Purchased loans | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 1,810 | 1,177
Purchased loans | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 197,455 | 275,570
Purchased loans | Commercial, financial, agricultural | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 195,614 | 273,488
Loans, net of unearned income | 197,022 | 275,139
Purchased loans | Commercial, financial, agricultural | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 894 | 1,119
Purchased loans | Commercial, financial, agricultural | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 514 | 532
Purchased loans | Commercial, financial, agricultural | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 84 | 232
Loans, net of unearned income | 433 | 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 | 349 | 199
Purchased loans | Real estate – construction |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 70,438 | 85,731
Purchased loans | Real estate – construction | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 69,519 | 85,316
Loans, net of unearned income | 70,438 | 85,731
Purchased loans | Real estate – construction | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 919 | 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 | 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 | 520,649 | 614,187
Purchased loans | Real estate – 1-4 family mortgage | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 512,235 | 602,464
Loans, net of unearned income | 517,539 | 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 | 3,127 | 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 | 2,177 | 2,280
Purchased loans | Real estate – 1-4 family mortgage | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 1,614 | 2,109
Loans, net of unearned income | 3,110 | 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 | 260 | 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 | 1,236 | 879
Purchased loans | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 906,219 | 1,037,454
Purchased loans | Real estate – commercial mortgage | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 901,527 | 1,031,141
Loans, net of unearned income | 905,447 | 1,036,998
Purchased loans | Real estate – commercial mortgage | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 1,150 | 2,947
Purchased loans | Real estate – commercial mortgage | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 2,770 | 2,910
Purchased loans | Real estate – commercial mortgage | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 210 | 166
Loans, net of unearned income | 772 | 456
Purchased loans | Real estate – commercial mortgage | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 430 | 191
Purchased loans | Real estate – commercial mortgage | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 132 | 99
Purchased loans | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 15,130 | 18,824
Purchased loans | Installment loans to individuals | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 14,781 | 18,443
Loans, net of unearned income | 14,884 | 18,660
Purchased loans | Installment loans to individuals | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 73 | 208
Purchased loans | Installment loans to individuals | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 30 | 9
Purchased loans | Installment loans to individuals | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 151 | 105
Loans, net of unearned income | 246 | 164
Purchased loans | Installment loans to individuals | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 2 | 59
Purchased loans | Installment loans to individuals | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | $ 93 | $ 0

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