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Purchased Loans - Aging of Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Past due and nonaccrual loans |  |
Total loans, gross | $ 7,623,663 | $ 6,205,118
Unearned income | (3,341) | (2,409)
Loans, net of unearned income | 7,620,322 | 6,202,709
Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Total loans, gross | 1,039,393 | 717,490
Loans, net of unearned income | 1,039,393 | 717,490
Lease financing |  |
Past due and nonaccrual loans |  |
Total loans, gross | 57,354 | 49,250
Real estate – construction |  |
Past due and nonaccrual loans |  |
Total loans, gross | 633,389 | 552,679
Loans, net of unearned income | 633,389 | 552,679
Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 2,343,721 | 1,878,177
Loans, net of unearned income | 2,343,721 | 1,878,177
Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 3,427,530 | 2,898,895
Loans, net of unearned income | 3,427,530 | 2,898,895
Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Total loans, gross | 122,276 | 108,627
Loans, net of unearned income | 176,289 | 155,468
Purchased |  |
Past due and nonaccrual loans |  |
Total loans, gross | 2,031,766 | 1,489,137
Unearned income | 0 | 0
Loans, net of unearned income | 2,031,766 | 1,489,137
Purchased | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 2,010,852 | 1,457,912
Unearned income | 0 | 0
Loans, net of unearned income | 2,027,342 | 1,477,790
Purchased | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 10,759 | 9,063
Purchased | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 5,731 | 10,815
Purchased | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 2,612 | 5,280
Unearned income | 0 | 0
Loans, net of unearned income | 4,424 | 11,347
Purchased | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 635 | 677
Purchased | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 1,177 | 5,390
Purchased | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Total loans, gross | 275,570 | 128,200
Purchased | Commercial, financial, agricultural | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 273,488 | 125,417
Total loans, gross | 275,139 | 127,230
Purchased | Commercial, financial, agricultural | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 1,119 | 823
Purchased | Commercial, financial, agricultural | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 532 | 990
Purchased | Commercial, financial, agricultural | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 232 | 329
Total loans, gross | 431 | 970
Purchased | Commercial, financial, agricultural | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 260
Purchased | Commercial, financial, agricultural | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 199 | 381
Purchased | Lease financing |  |
Past due and nonaccrual loans |  |
Total loans, gross | 0 | 0
Purchased | Lease financing | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 0 | 0
Total loans, gross | 0 | 0
Purchased | Lease financing | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 0
Purchased | Lease financing | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 0
Purchased | Lease financing | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 0 | 0
Total loans, gross | 0 | 0
Purchased | Lease financing | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 0
Purchased | Lease financing | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 0
Purchased | Real estate – construction |  |
Past due and nonaccrual loans |  |
Total loans, gross | 85,731 | 68,753
Purchased | Real estate – construction | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 85,316 | 67,760
Total loans, gross | 85,731 | 68,608
Purchased | Real estate – construction | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 415 | 527
Purchased | Real estate – construction | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 321
Purchased | Real estate – construction | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 0 | 0
Total loans, gross | 0 | 145
Purchased | Real estate – construction | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 0
Purchased | Real estate – construction | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 145
Purchased | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 614,187 | 452,447
Purchased | Real estate – 1-4 family mortgage | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 602,464 | 440,258
Total loans, gross | 610,814 | 448,212
Purchased | Real estate – 1-4 family mortgage | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 6,070 | 4,572
Purchased | Real estate – 1-4 family mortgage | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 2,280 | 3,382
Purchased | Real estate – 1-4 family mortgage | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 2,109 | 1,771
Total loans, gross | 3,373 | 4,235
Purchased | Real estate – 1-4 family mortgage | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 385 | 417
Purchased | Real estate – 1-4 family mortgage | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 879 | 2,047
Purchased | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 1,037,454 | 823,758
Purchased | Real estate – commercial mortgage | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 1,031,141 | 808,886
Total loans, gross | 1,036,998 | 818,043
Purchased | Real estate – commercial mortgage | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 2,947 | 3,045
Purchased | Real estate – commercial mortgage | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 2,910 | 6,112
Purchased | Real estate – commercial mortgage | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 166 | 3,054
Total loans, gross | 456 | 5,715
Purchased | Real estate – commercial mortgage | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 191 | 0
Purchased | Real estate – commercial mortgage | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 99 | 2,661
Purchased | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Total loans, gross | 18,824 | 15,979
Purchased | Installment loans to individuals | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 18,443 | 15,591
Total loans, gross | 18,660 | 15,697
Purchased | Installment loans to individuals | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 208 | 96
Purchased | Installment loans to individuals | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 9 | 10
Purchased | Installment loans to individuals | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 105 | 126
Total loans, gross | 164 | 282
Purchased | Installment loans to individuals | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 59 | 0
Purchased | Installment loans to individuals | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | $ 0 | $ 156

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