Loans and the Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Summary of loans
Gross loans	$ 3,881,019		$ 2,810,258
Unearned income	(1)		(5)
Loans, net of unearned income	3,881,018		2,810,253
Allowance for loan losses	(47,665)		(44,347)
Loans, net	3,833,353		2,765,906
Commercial, financial, agricultural
Summary of loans
Gross loans	468,963		317,050
Loans, net of unearned income	468,963		317,050
Lease financing
Summary of loans
Gross loans	53		195
Real estate – construction
Summary of loans
Gross loans	161,436		105,706
Loans, net of unearned income	161,436		105,706
Real estate – 1-4 family mortgage
Summary of loans
Gross loans	1,208,233		903,423
Loans, net of unearned income	1,208,233		903,423
Real estate – commercial mortgage
Summary of loans
Gross loans	1,950,572		1,426,643
Loans, net of unearned income	1,950,572		1,426,643
Installment loans to individuals
Summary of loans
Gross loans	91,762		57,241
Loans, net of unearned income	$ 91,814	[1]	$ 57,431	[1]

[1] Includes lease financing receivables.