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Non 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 |  |
Total loans, gross | $ 7,770,983 | $ 7,623,663
Unearned income | (3,326) | (3,341)
Loans, net of unearned income | 7,767,657 | 7,620,322
Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Total loans, gross | 987,818 | 1,039,393
Loans, net of unearned income | 987,818 | 1,039,393
Lease financing |  |
Past due and nonaccrual loans |  |
Total loans, gross | 55,749 | 57,354
Real estate – construction |  |
Past due and nonaccrual loans |  |
Total loans, gross | 712,818 | 633,389
Loans, net of unearned income | 712,818 | 633,389
Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 2,433,099 | 2,343,721
Loans, net of unearned income | 2,433,099 | 2,343,721
Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 3,461,174 | 3,427,530
Loans, net of unearned income | 3,461,174 | 3,427,530
Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Total loans, gross | 120,325 | 122,276
Loans, net of unearned income | 172,748 | 176,289
Non purchased loans and leases |  |
Past due and nonaccrual loans |  |
Total loans, gross | 6,061,092 | 5,591,897
Unearned income | (3,326) | (3,341)
Loans, net of unearned income | 6,057,766 | 5,588,556
Non purchased loans and leases | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Total loans, gross | 790,363 | 763,823
Non purchased loans and leases | Lease financing |  |
Past due and nonaccrual loans |  |
Total loans, gross | 55,749 | 57,354
Non purchased loans and leases | Real estate – construction |  |
Past due and nonaccrual loans |  |
Total loans, gross | 642,380 | 547,658
Non purchased loans and leases | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 1,912,450 | 1,729,534
Non purchased loans and leases | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 2,554,955 | 2,390,076
Non purchased loans and leases | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Total loans, gross | 105,195 | 103,452
Non purchased loans and leases | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 6,035,042 | 5,558,312
Unearned income | (3,326) | (3,341)
Loans, net of unearned income | 6,048,845 | 5,578,306
Non purchased loans and leases | Accruing Loans | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Current Loans | 786,645 | 759,143
Total loans, gross | 788,370 | 761,887
Non purchased loans and leases | Accruing Loans | Lease financing |  |
Past due and nonaccrual loans |  |
Current Loans | 55,082 | 57,148
Total loans, gross | 55,414 | 57,195
Non purchased loans and leases | Accruing Loans | Real estate – construction |  |
Past due and nonaccrual loans |  |
Current Loans | 642,058 | 547,608
Total loans, gross | 642,380 | 547,658
Non purchased loans and leases | Accruing Loans | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Current Loans | 1,901,680 | 1,712,982
Total loans, gross | 1,910,264 | 1,726,986
Non purchased loans and leases | Accruing Loans | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Current Loans | 2,548,264 | 2,381,871
Total loans, gross | 2,550,587 | 2,384,519
Non purchased loans and leases | Accruing Loans | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Current Loans | 104,639 | 102,901
Total loans, gross | 105,156 | 103,402
Non purchased loans and leases | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 2,772 | 4,129
Unearned income | 0 | 0
Loans, net of unearned income | 8,921 | 10,250
Non purchased loans and leases | Nonaccruing Loans | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Current Loans | 93 | 698
Total loans, gross | 1,993 | 1,936
Non purchased loans and leases | Nonaccruing Loans | Lease financing |  |
Past due and nonaccrual loans |  |
Current Loans | 0 | 0
Total loans, gross | 335 | 159
Non purchased loans and leases | Nonaccruing Loans | Real estate – construction |  |
Past due and nonaccrual loans |  |
Current Loans | 0 | 0
Total loans, gross | 0 | 0
Non purchased loans and leases | Nonaccruing Loans | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Current Loans | 742 | 730
Total loans, gross | 2,186 | 2,548
Non purchased loans and leases | Nonaccruing Loans | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Current Loans | 1,927 | 2,680
Total loans, gross | 4,368 | 5,557
Non purchased loans and leases | Nonaccruing Loans | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Current Loans | 10 | 21
Total loans, gross | 39 | 50
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans |  |
Past due and nonaccrual loans |  |
Loans past due | 11,613 | 16,979
Unearned income | 0 | 0
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Loans past due | 1,575 | 2,722
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Lease financing |  |
Past due and nonaccrual loans |  |
Loans past due | 288 | 47
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Real estate – construction |  |
Past due and nonaccrual loans |  |
Loans past due | 273 | 50
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Loans past due | 6,921 | 11,810
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Loans past due | 2,069 | 1,921
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Loans past due | 487 | 429
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Loans past due | 306 | 206
Unearned income | 0 | 0
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 205
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans | Lease financing |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 0
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans | Real estate – construction |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 0
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Loans past due | 286 | 0
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Loans past due | 14 | 0
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Loans past due | 6 | 1
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans |  |
Past due and nonaccrual loans |  |
Loans past due | 2,190 | 3,015
Unearned income | 0 | 0
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Loans past due | 150 | 22
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans | Lease financing |  |
Past due and nonaccrual loans |  |
Loans past due | 44 | 0
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans | Real estate – construction |  |
Past due and nonaccrual loans |  |
Loans past due | 49 | 0
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Loans past due | 1,663 | 2,194
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Loans past due | 254 | 727
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Loans past due | 30 | 72
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Loans past due | 5,843 | 5,915
Unearned income | 0 | 0
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Loans past due | 1,900 | 1,033
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans | Lease financing |  |
Past due and nonaccrual loans |  |
Loans past due | 335 | 159
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans | Real estate – construction |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 0
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Loans past due | 1,158 | 1,818
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Loans past due | 2,427 | 2,877
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Loans past due | $ 23 | $ 28

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