Loans and Allowance for Loan Losses (Nonaccrual Status) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Interest lost on nonaccrual loans	$ 4,700,000	$ 5,400,000
Loans on nonaccrual status	35,200,000	79,200,000
Loans held for investment on nonaccrual status	35,165,000	79,242,000
Net loans held for investment	1,185,463,000	1,147,721,000
Nonperforming [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment on nonaccrual status	35,165,000	79,242,000
90 or more days past due and accruing	0	227,000
Net loans held for investment	35,165,000	79,469,000
Nonperforming [Member] | Commercial and agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment on nonaccrual status	516,000	2,746,000
Nonperforming [Member] | Real estate - construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment on nonaccrual status	4,677,000	14,297,000
Nonperforming [Member] | Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment on nonaccrual status	11,580,000	18,372,000
Nonperforming [Member] | Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment on nonaccrual status	18,380,000	43,621,000
Nonperforming [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment on nonaccrual status	$ 12,000	$ 206,000