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Non Purchased Loans - Aging of Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Past due and nonaccrual loans |  |
Total loans, gross | $ 7,451,394 | $ 6,205,118
Unearned income | (2,786) | (2,409)
Loans, net of unearned income | 7,448,608 | 6,202,709
Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Total loans, gross | 1,008,935 | 717,490
Loans, net of unearned income | 1,008,935 | 717,490
Lease financing |  |
Past due and nonaccrual loans |  |
Total loans, gross | 54,688 | 49,250
Real estate – construction |  |
Past due and nonaccrual loans |  |
Total loans, gross | 577,720 | 552,679
Loans, net of unearned income | 577,720 | 552,679
Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 2,295,852 | 1,878,177
Loans, net of unearned income | 2,295,852 | 1,878,177
Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 3,390,389 | 2,898,895
Loans, net of unearned income | 3,390,389 | 2,898,895
Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Total loans, gross | 123,810 | 108,627
Loans, net of unearned income | 175,712 | 155,468
Non purchased loans and leases |  |
Past due and nonaccrual loans |  |
Total loans, gross | 5,296,253 | 4,715,981
Unearned income | (2,786) | (2,409)
Loans, net of unearned income | 5,293,467 | 4,713,572
Non purchased loans and leases | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Total loans, gross | 707,835 | 589,290
Non purchased loans and leases | Lease financing |  |
Past due and nonaccrual loans |  |
Total loans, gross | 54,688 | 49,250
Non purchased loans and leases | Real estate – construction |  |
Past due and nonaccrual loans |  |
Total loans, gross | 477,638 | 483,926
Non purchased loans and leases | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 1,644,060 | 1,425,730
Non purchased loans and leases | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 2,311,340 | 2,075,137
Non purchased loans and leases | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Total loans, gross | 100,692 | 92,648
Non purchased loans and leases | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 5,267,810 | 4,689,425
Unearned income | (2,786) | (2,409)
Loans, net of unearned income | 5,283,497 | 4,702,299
Non purchased loans and leases | Accruing Loans | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Current Loans | 703,574 | 586,730
Total loans, gross | 706,156 | 588,261
Non purchased loans and leases | Accruing Loans | Lease financing |  |
Past due and nonaccrual loans |  |
Current Loans | 54,047 | 48,919
Total loans, gross | 54,523 | 49,112
Non purchased loans and leases | Accruing Loans | Real estate – construction |  |
Past due and nonaccrual loans |  |
Current Loans | 477,235 | 482,931
Total loans, gross | 477,638 | 483,926
Non purchased loans and leases | Accruing Loans | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Current Loans | 1,632,983 | 1,414,254
Total loans, gross | 1,640,274 | 1,421,579
Non purchased loans and leases | Accruing Loans | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Current Loans | 2,302,423 | 2,066,821
Total loans, gross | 2,307,068 | 2,069,203
Non purchased loans and leases | Accruing Loans | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Current Loans | 100,334 | 92,179
Total loans, gross | 100,624 | 92,627
Non purchased loans and leases | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 5,504 | 5,441
Unearned income | 0 | 0
Loans, net of unearned income | 9,970 | 11,273
Non purchased loans and leases | Nonaccruing Loans | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Current Loans | 278 | 97
Total loans, gross | 1,679 | 1,029
Non purchased loans and leases | Nonaccruing Loans | Lease financing |  |
Past due and nonaccrual loans |  |
Current Loans | 0 | 0
Total loans, gross | 165 | 138
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 | 2,234 | 2,768
Total loans, gross | 3,786 | 4,151
Non purchased loans and leases | Nonaccruing Loans | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Current Loans | 2,969 | 2,576
Total loans, gross | 4,272 | 5,934
Non purchased loans and leases | Nonaccruing Loans | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Current Loans | 23 | 0
Total loans, gross | 68 | 21
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans |  |
Past due and nonaccrual loans |  |
Loans past due | 12,392 | 10,795
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Loans past due | 1,808 | 811
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Lease financing |  |
Past due and nonaccrual loans |  |
Loans past due | 476 | 193
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Real estate – construction |  |
Past due and nonaccrual loans |  |
Loans past due | 403 | 995
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 | 6,307 | 6,189
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Loans past due | 3,140 | 2,283
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Loans past due | 258 | 324
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Loans past due | 748 | 741
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Loans past due | 538 | 0
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 | 210 | 161
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 580
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 0
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans |  |
Past due and nonaccrual loans |  |
Loans past due | 3,295 | 2,079
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Loans past due | 774 | 720
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 | 984 | 1,136
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 | 1,505 | 99
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 | 32 | 124
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Loans past due | 3,718 | 5,091
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Loans past due | 863 | 932
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans | Lease financing |  |
Past due and nonaccrual loans |  |
Loans past due | 165 | 138
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 | 1,342 | 1,222
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 | 1,303 | 2,778
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 | $ 45 | $ 21

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