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Non Purchased Loans - Aging of Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Past due and nonaccrual loans
Total loans, gross	$ 9,057,522	$ 9,086,256
Unearned income	(2,868)	(3,127)
Loans, net of unearned income	9,054,654	9,083,129
Commercial, financial, agricultural
Past due and nonaccrual loans
Total loans, gross	1,305,076	1,295,912
Loans, net of unearned income	1,305,076	1,295,912
Lease financing
Past due and nonaccrual loans
Total loans, gross	62,026	64,992
Real estate – construction
Past due and nonaccrual loans
Total loans, gross	781,531	740,668
Loans, net of unearned income	781,531	740,668
Real estate – 1-4 family mortgage
Past due and nonaccrual loans
Total loans, gross	2,765,472	2,795,343
Loans, net of unearned income	2,765,472	2,795,343
Real estate – commercial mortgage
Past due and nonaccrual loans
Total loans, gross	4,017,969	4,051,509
Loans, net of unearned income	4,017,969	4,051,509
Installment loans to individuals
Past due and nonaccrual loans
Total loans, gross	125,448	137,832
Loans, net of unearned income	184,606	199,697
Non purchased loans and leases
Past due and nonaccrual loans
Total loans, gross	6,707,156	6,392,839
Unearned income	(2,868)	(3,127)
Loans, net of unearned income	6,704,288	6,389,712
Non purchased loans and leases | Commercial, financial, agricultural
Past due and nonaccrual loans
Total loans, gross	930,598	875,649
Non purchased loans and leases | Lease financing
Past due and nonaccrual loans
Total loans, gross	62,026	64,992
Non purchased loans and leases | Real estate – construction
Past due and nonaccrual loans
Total loans, gross	716,129	635,519
Non purchased loans and leases | Real estate – 1-4 family mortgage
Past due and nonaccrual loans
Total loans, gross	2,160,617	2,087,890
Non purchased loans and leases | Real estate – commercial mortgage
Past due and nonaccrual loans
Total loans, gross	2,741,402	2,628,365
Non purchased loans and leases | Installment loans to individuals
Past due and nonaccrual loans
Total loans, gross	96,384	100,424
Non purchased loans and leases | Accruing Loans
Past due and nonaccrual loans
Current Loans	6,671,187	6,359,292
Unearned income	(2,868)	(3,127)
Loans, net of unearned income	6,690,020	6,379,494
Non purchased loans and leases | Accruing Loans | Commercial, financial, agricultural
Past due and nonaccrual loans
Current Loans	922,972	870,457
Total loans, gross	925,072	874,121
Non purchased loans and leases | Accruing Loans | Lease financing
Past due and nonaccrual loans
Current Loans	61,486	64,296
Total loans, gross	61,956	64,992
Non purchased loans and leases | Accruing Loans | Real estate – construction
Past due and nonaccrual loans
Current Loans	713,563	634,632
Total loans, gross	716,129	635,519
Non purchased loans and leases | Accruing Loans | Real estate – 1-4 family mortgage
Past due and nonaccrual loans
Current Loans	2,146,622	2,071,401
Total loans, gross	2,156,228	2,083,930
Non purchased loans and leases | Accruing Loans | Real estate – commercial mortgage
Past due and nonaccrual loans
Current Loans	2,733,595	2,621,902
Total loans, gross	2,737,208	2,623,795
Non purchased loans and leases | Accruing Loans | Installment loans to individuals
Past due and nonaccrual loans
Current Loans	95,817	99,731
Total loans, gross	96,295	100,264
Non purchased loans and leases | Nonaccruing Loans
Past due and nonaccrual loans
Current Loans	3,603	2,814
Unearned income	0	0
Loans, net of unearned income	14,268	10,218
Non purchased loans and leases | Nonaccruing Loans | Commercial, financial, agricultural
Past due and nonaccrual loans
Current Loans	452	172
Total loans, gross	5,526	1,528
Non purchased loans and leases | Nonaccruing Loans | Lease financing
Past due and nonaccrual loans
Current Loans	0	0
Total loans, gross	70	0
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	1,368	1,046
Total loans, gross	4,389	3,960
Non purchased loans and leases | Nonaccruing Loans | Real estate – commercial mortgage
Past due and nonaccrual loans
Current Loans	1,783	1,596
Total loans, gross	4,194	4,570
Non purchased loans and leases | Nonaccruing Loans | Installment loans to individuals
Past due and nonaccrual loans
Current Loans	0	0
Total loans, gross	89	160
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans
Past due and nonaccrual loans
Loans past due	14,658	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	1,945	3,397
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Lease financing
Past due and nonaccrual loans
Loans past due	470	607
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Real estate – construction
Past due and nonaccrual loans
Loans past due	2,566	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	6,398	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	2,835	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	444	368
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans
Past due and nonaccrual loans
Loans past due	844	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	772	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	68	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	4	3
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans
Past due and nonaccrual loans
Loans past due	4,175	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	155	267
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans | Lease financing
Past due and nonaccrual loans
Loans past due	0	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	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	3,208	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	778	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	34	165
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans
Past due and nonaccrual loans
Loans past due	9,821	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	5,074	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	70	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	2,249	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	2,343	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	$ 85	$ 157

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