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Non Purchased Loans - Aging of Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Past due and nonaccrual loans |  |
Total loans, gross | $ 9,126,211 | $ 7,623,663
Unearned income | (3,304) | (3,341)
Loans, net of unearned income | 9,122,907 | 7,620,322
Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Total loans, gross | 1,313,344 | 1,039,393
Loans, net of unearned income | 1,313,344 | 1,039,393
Lease financing |  |
Past due and nonaccrual loans |  |
Total loans, gross | 57,576 | 57,354
Real estate – construction |  |
Past due and nonaccrual loans |  |
Total loans, gross | 736,985 | 633,389
Loans, net of unearned income | 736,985 | 633,389
Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 2,762,683 | 2,343,721
Loans, net of unearned income | 2,762,683 | 2,343,721
Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 4,112,585 | 3,427,530
Loans, net of unearned income | 4,112,585 | 3,427,530
Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Total loans, gross | 143,038 | 122,276
Loans, net of unearned income | 197,310 | 176,289
Non purchased loans and leases |  |
Past due and nonaccrual loans |  |
Total loans, gross | 6,213,542 | 5,591,897
Unearned income | (3,304) | (3,341)
Loans, net of unearned income | 6,210,238 | 5,588,556
Non purchased loans and leases | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Total loans, gross | 817,799 | 763,823
Non purchased loans and leases | Lease financing |  |
Past due and nonaccrual loans |  |
Total loans, gross | 57,576 | 57,354
Non purchased loans and leases | Real estate – construction |  |
Past due and nonaccrual loans |  |
Total loans, gross | 624,892 | 547,658
Non purchased loans and leases | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 2,000,770 | 1,729,534
Non purchased loans and leases | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 2,609,510 | 2,390,076
Non purchased loans and leases | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Total loans, gross | 102,995 | 103,452
Non purchased loans and leases | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 6,181,873 | 5,558,312
Unearned income | (3,304) | (3,341)
Loans, net of unearned income | 6,200,542 | 5,578,306
Non purchased loans and leases | Accruing Loans | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Current Loans | 814,246 | 759,143
Total loans, gross | 816,171 | 761,887
Non purchased loans and leases | Accruing Loans | Lease financing |  |
Past due and nonaccrual loans |  |
Current Loans | 57,256 | 57,148
Total loans, gross | 57,576 | 57,195
Non purchased loans and leases | Accruing Loans | Real estate – construction |  |
Past due and nonaccrual loans |  |
Current Loans | 623,823 | 547,608
Total loans, gross | 624,892 | 547,658
Non purchased loans and leases | Accruing Loans | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Current Loans | 1,986,079 | 1,712,982
Total loans, gross | 1,996,972 | 1,726,986
Non purchased loans and leases | Accruing Loans | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Current Loans | 2,601,728 | 2,381,871
Total loans, gross | 2,605,288 | 2,384,519
Non purchased loans and leases | Accruing Loans | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Current Loans | 102,045 | 102,901
Total loans, gross | 102,947 | 103,402
Non purchased loans and leases | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 2,692 | 4,129
Unearned income | 0 | 0
Loans, net of unearned income | 9,696 | 10,250
Non purchased loans and leases | Nonaccruing Loans | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Current Loans | 205 | 698
Total loans, gross | 1,628 | 1,936
Non purchased loans and leases | Nonaccruing Loans | Lease financing |  |
Past due and nonaccrual loans |  |
Current Loans | 0 | 0
Total loans, gross | 0 | 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 | 913 | 730
Total loans, gross | 3,798 | 2,548
Non purchased loans and leases | Nonaccruing Loans | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Current Loans | 1,570 | 2,680
Total loans, gross | 4,222 | 5,557
Non purchased loans and leases | Nonaccruing Loans | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Current Loans | 4 | 21
Total loans, gross | 48 | 50
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans |  |
Past due and nonaccrual loans |  |
Loans past due | 14,863 | 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 | 1,606 | 2,722
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Lease financing |  |
Past due and nonaccrual loans |  |
Loans past due | 320 | 47
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Real estate – construction |  |
Past due and nonaccrual loans |  |
Loans past due | 1,069 | 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 | 7,928 | 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 | 3,080 | 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 | 860 | 429
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Loans past due | 537 | 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 | 207 | 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 | 324 | 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 | 3,806 | 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 | 319 | 22
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans | Lease financing |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 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 | 0 | 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 | 2,965 | 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 | 480 | 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 | 42 | 72
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Loans past due | 6,467 | 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 | 1,423 | 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 | 0 | 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 | 2,678 | 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 | 2,328 | 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 | $ 38 | $ 28

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