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Non 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
Non-Purchased |  |
Past due and nonaccrual loans |  |
Total loans, gross | 5,591,897 | 4,715,981
Unearned income | (3,341) | (2,409)
Loans, net of unearned income | 5,588,556 | 4,713,572
Non-Purchased | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 5,558,312 | 4,689,425
Unearned income | (3,341) | (2,409)
Loans, net of unearned income | 5,578,306 | 4,702,299
Non-Purchased | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 16,979 | 10,795
Non-Purchased | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 3,015 | 2,079
Non-Purchased | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 4,129 | 5,441
Unearned income | 0 | 0
Loans, net of unearned income | 10,250 | 11,273
Non-Purchased | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 206 | 741
Non-Purchased | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 5,915 | 5,091
Non-Purchased | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Total loans, gross | 763,823 | 589,290
Non-Purchased | Commercial, financial, agricultural | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 759,143 | 586,730
Total loans, gross | 761,887 | 588,261
Non-Purchased | Commercial, financial, agricultural | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 2,722 | 811
Non-Purchased | Commercial, financial, agricultural | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 22 | 720
Non-Purchased | Commercial, financial, agricultural | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 698 | 97
Total loans, gross | 1,936 | 1,029
Non-Purchased | Commercial, financial, agricultural | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 205 | 0
Non-Purchased | Commercial, financial, agricultural | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 1,033 | 932
Non-Purchased | Lease financing |  |
Past due and nonaccrual loans |  |
Total loans, gross | 57,354 | 49,250
Non-Purchased | Lease financing | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 57,148 | 48,919
Total loans, gross | 57,195 | 49,112
Non-Purchased | Lease financing | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 47 | 193
Non-Purchased | Lease financing | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 0
Non-Purchased | Lease financing | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 0 | 0
Total loans, gross | 159 | 138
Non-Purchased | Lease financing | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 0
Non-Purchased | Lease financing | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 159 | 138
Non-Purchased | Real estate – construction |  |
Past due and nonaccrual loans |  |
Total loans, gross | 547,658 | 483,926
Non-Purchased | Real estate – construction | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 547,608 | 482,931
Total loans, gross | 547,658 | 483,926
Non-Purchased | Real estate – construction | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 50 | 995
Non-Purchased | Real estate – construction | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 0
Non-Purchased | Real estate – construction | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 0 | 0
Total loans, gross | 0 | 0
Non-Purchased | Real estate – construction | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 0
Non-Purchased | Real estate – construction | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 0
Non-Purchased | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 1,729,534 | 1,425,730
Non-Purchased | Real estate – 1-4 family mortgage | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 1,712,982 | 1,414,254
Total loans, gross | 1,726,986 | 1,421,579
Non-Purchased | Real estate – 1-4 family mortgage | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 11,810 | 6,189
Non-Purchased | Real estate – 1-4 family mortgage | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 2,194 | 1,136
Non-Purchased | Real estate – 1-4 family mortgage | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 730 | 2,768
Total loans, gross | 2,548 | 4,151
Non-Purchased | Real estate – 1-4 family mortgage | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 161
Non-Purchased | Real estate – 1-4 family mortgage | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 1,818 | 1,222
Non-Purchased | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 2,390,076 | 2,075,137
Non-Purchased | Real estate – commercial mortgage | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 2,381,871 | 2,066,821
Total loans, gross | 2,384,519 | 2,069,203
Non-Purchased | Real estate – commercial mortgage | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 1,921 | 2,283
Non-Purchased | Real estate – commercial mortgage | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 727 | 99
Non-Purchased | Real estate – commercial mortgage | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 2,680 | 2,576
Total loans, gross | 5,557 | 5,934
Non-Purchased | Real estate – commercial mortgage | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 0 | 580
Non-Purchased | Real estate – commercial mortgage | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 2,877 | 2,778
Non-Purchased | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Total loans, gross | 103,452 | 92,648
Non-Purchased | Installment loans to individuals | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 102,901 | 92,179
Total loans, gross | 103,402 | 92,627
Non-Purchased | Installment loans to individuals | Accruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 429 | 324
Non-Purchased | Installment loans to individuals | Accruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 72 | 124
Non-Purchased | Installment loans to individuals | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 21 | 0
Total loans, gross | 50 | 21
Non-Purchased | Installment loans to individuals | Nonaccruing Loans | 30-89 Days Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | 1 | 0
Non-Purchased | Installment loans to individuals | Nonaccruing Loans | 90 Days or More Past Due |  |
Past due and nonaccrual loans |  |
Loans past due | $ 28 | $ 21

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