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Non Purchased Loans - Aging of Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Past due and nonaccrual loans |  |
Total loans, gross | $ 9,317,448 | $ 9,086,256
Unearned income | (3,664) | (3,127)
Loans, net of unearned income | 9,313,784 | 9,083,129
Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Total loans, gross | 1,328,560 | 1,295,912
Loans, net of unearned income | 1,328,560 | 1,295,912
Lease financing |  |
Past due and nonaccrual loans |  |
Total loans, gross | 73,617 | 64,992
Real estate – construction |  |
Past due and nonaccrual loans |  |
Total loans, gross | 816,695 | 740,668
Loans, net of unearned income | 816,695 | 740,668
Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 2,797,633 | 2,795,343
Loans, net of unearned income | 2,797,633 | 2,795,343
Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 4,022,375 | 4,051,509
Loans, net of unearned income | 4,022,375 | 4,051,509
Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Total loans, gross | 278,568 | 137,832
Loans, net of unearned income | 348,521 | 199,697
Non purchased loans and leases |  |
Past due and nonaccrual loans |  |
Total loans, gross | 7,035,482 | 6,392,839
Unearned income | (3,664) | (3,127)
Loans, net of unearned income | 7,031,818 | 6,389,712
Non purchased loans and leases | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Total loans, gross | 988,867 | 875,649
Non purchased loans and leases | Lease financing |  |
Past due and nonaccrual loans |  |
Total loans, gross | 73,617 | 64,992
Non purchased loans and leases | Real estate – construction |  |
Past due and nonaccrual loans |  |
Total loans, gross | 764,589 | 635,519
Non purchased loans and leases | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 2,235,908 | 2,087,890
Non purchased loans and leases | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Total loans, gross | 2,809,470 | 2,628,365
Non purchased loans and leases | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Total loans, gross | 163,031 | 100,424
Non purchased loans and leases | Accruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 6,995,958 | 6,359,292
Unearned income | (3,664) | (3,127)
Loans, net of unearned income | 7,016,085 | 6,379,494
Non purchased loans and leases | Accruing Loans | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Current Loans | 981,535 | 870,457
Total loans, gross | 983,383 | 874,121
Non purchased loans and leases | Accruing Loans | Lease financing |  |
Past due and nonaccrual loans |  |
Current Loans | 72,537 | 64,296
Total loans, gross | 73,617 | 64,992
Non purchased loans and leases | Accruing Loans | Real estate – construction |  |
Past due and nonaccrual loans |  |
Current Loans | 764,068 | 634,632
Total loans, gross | 764,335 | 635,519
Non purchased loans and leases | Accruing Loans | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Current Loans | 2,216,947 | 2,071,401
Total loans, gross | 2,230,740 | 2,083,930
Non purchased loans and leases | Accruing Loans | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Current Loans | 2,802,517 | 2,621,902
Total loans, gross | 2,804,751 | 2,623,795
Non purchased loans and leases | Accruing Loans | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Current Loans | 162,018 | 99,731
Total loans, gross | 162,923 | 100,264
Non purchased loans and leases | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Current Loans | 3,472 | 2,814
Unearned income | 0 | 0
Loans, net of unearned income | 15,733 | 10,218
Non purchased loans and leases | Nonaccruing Loans | Commercial, financial, agricultural |  |
Past due and nonaccrual loans |  |
Current Loans | 183 | 172
Total loans, gross | 5,484 | 1,528
Non purchased loans and leases | Nonaccruing Loans | Lease financing |  |
Past due and nonaccrual loans |  |
Current Loans | 0 | 0
Total loans, gross | 0 | 0
Non purchased loans and leases | Nonaccruing Loans | Real estate – construction |  |
Past due and nonaccrual loans |  |
Current Loans | 254 | 0
Total loans, gross | 254 | 0
Non purchased loans and leases | Nonaccruing Loans | Real estate – 1-4 family mortgage |  |
Past due and nonaccrual loans |  |
Current Loans | 1,594 | 1,046
Total loans, gross | 5,168 | 3,960
Non purchased loans and leases | Nonaccruing Loans | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Current Loans | 1,372 | 1,596
Total loans, gross | 4,719 | 4,570
Non purchased loans and leases | Nonaccruing Loans | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Current Loans | 69 | 0
Total loans, gross | 108 | 160
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans |  |
Past due and nonaccrual loans |  |
Loans past due | 12,802 | 17,517
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 | 931 | 3,397
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Lease financing |  |
Past due and nonaccrual loans |  |
Loans past due | 676 | 607
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Real estate – construction |  |
Past due and nonaccrual loans |  |
Loans past due | 139 | 887
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 | 9,420 | 10,378
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Loans past due | 799 | 1,880
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Installment loans to individuals |  |
Past due and nonaccrual loans |  |
Loans past due | 837 | 368
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Loans past due | 1,033 | 241
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 | 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 | 613 | 238
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans | Real estate – commercial mortgage |  |
Past due and nonaccrual loans |  |
Loans past due | 420 | 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 | 0 | 3
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans |  |
Past due and nonaccrual loans |  |
Loans past due | 7,325 | 2,685
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 | 917 | 267
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans | Lease financing |  |
Past due and nonaccrual loans |  |
Loans past due | 404 | 89
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans | Real estate – construction |  |
Past due and nonaccrual loans |  |
Loans past due | 128 | 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 | 4,373 | 2,151
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 | 1,435 | 13
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 | 68 | 165
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans |  |
Past due and nonaccrual loans |  |
Loans past due | 11,228 | 7,163
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 | 5,301 | 1,356
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans | Lease financing |  |
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 – 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 | 2,961 | 2,676
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 | 2,927 | 2,974
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 | $ 39 | $ 157

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