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Non Purchased Loans - (Details 1) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Past due and nonaccrual loans
Total loans, gross	$ 6,374,288	$ 6,205,118
Unearned income	(3,281)	(2,409)
Loans, net of unearned income	6,371,007	6,202,709
Commercial, financial, agricultural
Past due and nonaccrual loans
Total loans, gross	760,582	717,490
Loans, net of unearned income	760,582	717,490
Lease financing
Past due and nonaccrual loans
Total loans, gross	52,347	49,250
Real estate – construction
Past due and nonaccrual loans
Total loans, gross	460,807	552,679
Loans, net of unearned income	460,807	552,679
Real estate – 1-4 family mortgage
Past due and nonaccrual loans
Total loans, gross	1,952,394	1,878,177
Loans, net of unearned income	1,952,394	1,878,177
Real estate – commercial mortgage
Past due and nonaccrual loans
Total loans, gross	3,040,963	2,898,895
Loans, net of unearned income	3,040,963	2,898,895
Installment loans to individuals
Past due and nonaccrual loans
Total loans, gross	107,195	108,627
Loans, net of unearned income	156,261	155,468
Non purchased loans and leases
Past due and nonaccrual loans
Total loans, gross	5,062,179	4,715,981
Unearned income	(3,281)	(2,409)
Loans, net of unearned income	5,058,898	4,713,572
Non purchased loans and leases | Commercial, financial, agricultural
Past due and nonaccrual loans
Total loans, gross	657,713	589,290
Non purchased loans and leases | Lease financing
Past due and nonaccrual loans
Total loans, gross	52,347	49,250
Non purchased loans and leases | Real estate – construction
Past due and nonaccrual loans
Total loans, gross	424,861	483,926
Non purchased loans and leases | Real estate – 1-4 family mortgage
Past due and nonaccrual loans
Total loans, gross	1,551,934	1,425,730
Non purchased loans and leases | Real estate – commercial mortgage
Past due and nonaccrual loans
Total loans, gross	2,281,220	2,075,137
Non purchased loans and leases | Installment loans to individuals
Past due and nonaccrual loans
Total loans, gross	94,104	92,648
Non purchased loans and leases | Accruing Loans
Past due and nonaccrual loans
Current Loans	5,037,144	4,689,425
Unearned income	(3,281)	(2,409)
Loans, net of unearned income	5,047,485	4,702,299
Non purchased loans and leases | Accruing Loans | Commercial, financial, agricultural
Past due and nonaccrual loans
Current Loans	654,670	586,730
Total loans, gross	655,645	588,261
Non purchased loans and leases | Accruing Loans | Lease financing
Past due and nonaccrual loans
Current Loans	52,177	48,919
Total loans, gross	52,347	49,112
Non purchased loans and leases | Accruing Loans | Real estate – construction
Past due and nonaccrual loans
Current Loans	424,861	482,931
Total loans, gross	424,861	483,926
Non purchased loans and leases | Accruing Loans | Real estate – 1-4 family mortgage
Past due and nonaccrual loans
Current Loans	1,540,332	1,414,254
Total loans, gross	1,547,592	1,421,579
Non purchased loans and leases | Accruing Loans | Real estate – commercial mortgage
Past due and nonaccrual loans
Current Loans	2,274,705	2,066,821
Total loans, gross	2,276,290	2,069,203
Non purchased loans and leases | Accruing Loans | Installment loans to individuals
Past due and nonaccrual loans
Current Loans	93,680	92,179
Total loans, gross	94,031	92,627
Non purchased loans and leases | Nonaccruing Loans
Past due and nonaccrual loans
Current Loans	4,550	5,441
Unearned income	0	0
Loans, net of unearned income	11,413	11,273
Non purchased loans and leases | Nonaccruing Loans | Commercial, financial, agricultural
Past due and nonaccrual loans
Current Loans	298	97
Total loans, gross	2,068	1,029
Non purchased loans and leases | Nonaccruing Loans | Lease financing
Past due and nonaccrual loans
Current Loans	0	0
Total loans, gross	0	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	2,343	2,768
Total loans, gross	4,342	4,151
Non purchased loans and leases | Nonaccruing Loans | Real estate – commercial mortgage
Past due and nonaccrual loans
Current Loans	1,901	2,576
Total loans, gross	4,930	5,934
Non purchased loans and leases | Nonaccruing Loans | Installment loans to individuals
Past due and nonaccrual loans
Current Loans	8	0
Total loans, gross	73	21
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans
Past due and nonaccrual loans
Loans past due	9,058	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	975	811
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Lease financing
Past due and nonaccrual loans
Loans past due	0	193
Non purchased loans and leases | 30-89 Days Past Due | Accruing Loans | Real estate – construction
Past due and nonaccrual loans
Loans past due	0	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	6,722	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	1,068	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	293	324
Non purchased loans and leases | 30-89 Days Past Due | Nonaccruing Loans
Past due and nonaccrual loans
Loans past due	634	741
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	0	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	634	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	1,283	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	0	720
Non purchased loans and leases | 90 Days or More Past Due | Accruing Loans | Lease financing
Past due and nonaccrual loans
Loans past due	170	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	538	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	517	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	58	124
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans
Past due and nonaccrual loans
Loans past due	6,229	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	1,770	932
Non purchased loans and leases | 90 Days or More Past Due | Nonaccruing Loans | Lease financing
Past due and nonaccrual loans
Loans past due	0	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	1,999	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	2,395	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	$ 65	$ 21

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