Loans and the Allowance for Loan Losses (Details 5) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Loan portfolio by risk-rating grades
Total	$ 2,029,351	$ 1,530,101
Pass
Loan portfolio by risk-rating grades
Total	1,908,662	1,383,422
Watch
Loan portfolio by risk-rating grades
Total	57,932	72,876
Substandard
Loan portfolio by risk-rating grades
Total	62,757	73,803
Commercial, financial, agricultural
Loan portfolio by risk-rating grades
Total	343,813	231,697
Commercial, financial, agricultural | Pass
Loan portfolio by risk-rating grades
Total	328,959	226,540
Commercial, financial, agricultural | Watch
Loan portfolio by risk-rating grades
Total	10,588	1,939
Commercial, financial, agricultural | Substandard
Loan portfolio by risk-rating grades
Total	4,266	3,218
Real estate – construction
Loan portfolio by risk-rating grades
Total	115,016	72,284
Real estate – construction | Pass
Loan portfolio by risk-rating grades
Total	114,428	71,633
Real estate – construction | Watch
Loan portfolio by risk-rating grades
Total	588	651
Real estate – construction | Substandard
Loan portfolio by risk-rating grades
Total	0	0
Real estate – 1-4 family mortgage
Loan portfolio by risk-rating grades
Total	164,150	152,874
Real estate – 1-4 family mortgage | Pass
Loan portfolio by risk-rating grades
Total	126,916	96,147
Real estate – 1-4 family mortgage | Watch
Loan portfolio by risk-rating grades
Total	13,864	24,138
Real estate – 1-4 family mortgage | Substandard
Loan portfolio by risk-rating grades
Total	23,370	32,589
Real estate – commercial mortgage
Loan portfolio by risk-rating grades
Total	1,406,353	1,073,239
Real estate – commercial mortgage | Pass
Loan portfolio by risk-rating grades
Total	1,338,340	989,095
Real estate – commercial mortgage | Watch
Loan portfolio by risk-rating grades
Total	32,892	46,148
Real estate – commercial mortgage | Substandard
Loan portfolio by risk-rating grades
Total	35,121	37,996
Installment loans to individuals
Loan portfolio by risk-rating grades
Total	19	7
Installment loans to individuals | Pass
Loan portfolio by risk-rating grades
Total	19	7
Installment loans to individuals | Watch
Loan portfolio by risk-rating grades
Total	0	0
Installment loans to individuals | Substandard
Loan portfolio by risk-rating grades
Total	$ 0	$ 0