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Purchased Loans - Aging of Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Past due and nonaccrual loans |  |
Loans, net of unearned income | $ 7,698,070 | $ 7,620,322
Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 1,046,818 | 1,039,393
Real estate – construction |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 657,491 | 633,389
Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 2,358,101 | 2,343,721
Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 3,463,953 | 3,427,530
Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 171,707 | 176,289
Purchased loans |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 1,867,948 | 2,031,766
Purchased loans | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 1,848,899 | 2,010,852
Loans, net of unearned income | 1,862,608 | 2,027,342
Purchased loans | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 9,145 | 10,759
Purchased loans | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 4,564 | 5,731
Purchased loans | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 1,827 | 2,612
Loans, net of unearned income | 5,340 | 4,424
Purchased loans | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 1,271 | 635
Purchased loans | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 2,242 | 1,177
Purchased loans | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 243,672 | 275,570
Purchased loans | Commercial, financial, agricultural | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 242,313 | 273,488
Loans, net of unearned income | 243,253 | 275,139
Purchased loans | Commercial, financial, agricultural | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 388 | 1,119
Purchased loans | Commercial, financial, agricultural | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 552 | 532
Purchased loans | Commercial, financial, agricultural | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 105 | 232
Loans, net of unearned income | 419 | 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 | 314 | 199
Purchased loans | Real estate – construction |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 75,061 | 85,731
Purchased loans | Real estate – construction | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 75,061 | 85,316
Loans, net of unearned income | 75,061 | 85,731
Purchased loans | Real estate – construction | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 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 | 572,830 | 614,187
Purchased loans | Real estate – 1-4 family mortgage | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 561,608 | 602,464
Loans, net of unearned income | 569,215 | 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 | 5,491 | 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 | 2,116 | 2,280
Purchased loans | Real estate – 1-4 family mortgage | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 1,304 | 2,109
Loans, net of unearned income | 3,615 | 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 | 1,265 | 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 | 1,046 | 879
Purchased loans | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 960,273 | 1,037,454
Purchased loans | Real estate – commercial mortgage | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 954,128 | 1,031,141
Loans, net of unearned income | 959,126 | 1,036,998
Purchased loans | Real estate – commercial mortgage | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 3,142 | 2,947
Purchased loans | Real estate – commercial mortgage | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 1,856 | 2,910
Purchased loans | Real estate – commercial mortgage | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 317 | 166
Loans, net of unearned income | 1,147 | 456
Purchased loans | Real estate – commercial mortgage | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 191
Purchased loans | Real estate – commercial mortgage | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 830 | 99
Purchased loans | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Loans, net of unearned income | 16,112 | 18,824
Purchased loans | Installment loans to individuals | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 15,789 | 18,443
Loans, net of unearned income | 15,953 | 18,660
Purchased loans | Installment loans to individuals | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 124 | 208
Purchased loans | Installment loans to individuals | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 40 | 9
Purchased loans | Installment loans to individuals | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 101 | 105
Loans, net of unearned income | 159 | 164
Purchased loans | Installment loans to individuals | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 6 | 59
Purchased loans | Installment loans to individuals | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | $ 52 | $ 0

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