Loans and the Allowance for Loan Losses (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Past due and nonaccrual loans
Total Loans	$ 3,881,018	$ 2,810,253
Commercial, financial, agricultural
Past due and nonaccrual loans
Total Loans	468,963	317,050
Lease financing
Past due and nonaccrual loans
Total Loans	53	195
Real estate – construction
Past due and nonaccrual loans
Total Loans	161,436	105,706
Real estate – 1-4 family mortgage
Past due and nonaccrual loans
Total Loans	1,208,233	903,423
Real estate – commercial mortgage
Past due and nonaccrual loans
Total Loans	1,950,572	1,426,643
Installment loans to individuals
Past due and nonaccrual loans
Total Loans	91,762	57,241
Unearned income
Past due and nonaccrual loans
Total Loans	(1)
Accruing Loans
Past due and nonaccrual loans
30-89 Days Past Due	22,475	12,530
90 Days or More Past Due	4,187	3,307
Current Loans	3,782,025	2,714,349
Total Loans	3,808,687	2,730,186
Accruing Loans | Commercial, financial, agricultural
Past due and nonaccrual loans
30-89 Days Past Due	2,067	484
90 Days or More Past Due	607	15
Current Loans	463,521	312,943
Total Loans	466,195	313,442
Accruing Loans | Lease financing
Past due and nonaccrual loans
30-89 Days Past Due	0	0
90 Days or More Past Due	0	0
Current Loans	53	195
Total Loans	53	195
Accruing Loans | Real estate – construction
Past due and nonaccrual loans
30-89 Days Past Due	664	80
90 Days or More Past Due	0	0
Current Loans	159,124	103,978
Total Loans	159,788	104,058
Accruing Loans | Real estate – 1-4 family mortgage
Past due and nonaccrual loans
30-89 Days Past Due	10,168	6,685
90 Days or More Past Due	2,206	1,992
Current Loans	1,179,703	867,053
Total Loans	1,192,077	875,730
Accruing Loans | Real estate – commercial mortgage
Past due and nonaccrual loans
30-89 Days Past Due	8,870	5,084
90 Days or More Past Due	1,286	1,250
Current Loans	1,888,745	1,373,470
Total Loans	1,898,901	1,379,804
Accruing Loans | Installment loans to individuals
Past due and nonaccrual loans
30-89 Days Past Due	706	197
90 Days or More Past Due	88	50
Current Loans	90,880	56,715
Total Loans	91,674	56,962
Accruing Loans | Unearned income
Past due and nonaccrual loans
30-89 Days Past Due	0	0
90 Days or More Past Due	0	0
Current Loans	(1)	(5)
Total Loans	(1)	(5)
Nonaccruing Loans
Past due and nonaccrual loans
30-89 Days Past Due	2,307	1,796
90 Days or More Past Due	47,167	56,758
Current Loans	22,857	21,513
Total Loans	72,331	80,067
Nonaccruing Loans | Commercial, financial, agricultural
Past due and nonaccrual loans
30-89 Days Past Due	138	215
90 Days or More Past Due	1,959	3,131
Current Loans	671	262
Total Loans	2,768	3,608
Nonaccruing Loans | Lease financing
Past due and nonaccrual loans
30-89 Days Past Due	0	0
90 Days or More Past Due	0	0
Current Loans	0	0
Total Loans	0	0
Nonaccruing Loans | Real estate – construction
Past due and nonaccrual loans
30-89 Days Past Due	0	0
90 Days or More Past Due	1,648	1,648
Current Loans	0	0
Total Loans	1,648	1,648
Nonaccruing Loans | Real estate – 1-4 family mortgage
Past due and nonaccrual loans
30-89 Days Past Due	1,203	1,249
90 Days or More Past Due	6,041	13,417
Current Loans	8,912	13,027
Total Loans	16,156	27,693
Nonaccruing Loans | Real estate – commercial mortgage
Past due and nonaccrual loans
30-89 Days Past Due	966	325
90 Days or More Past Due	37,439	38,297
Current Loans	13,266	8,217
Total Loans	51,671	46,839
Nonaccruing Loans | Installment loans to individuals
Past due and nonaccrual loans
30-89 Days Past Due	0	7
90 Days or More Past Due	80	265
Current Loans	8	7
Total Loans	88	279
Nonaccruing Loans | Unearned income
Past due and nonaccrual loans
30-89 Days Past Due	0	0
90 Days or More Past Due	0	0
Current Loans	0	0
Total Loans	$ 0	$ 0