Loans and Allowance for Loan Losses (Impaired Loans, Average Recorded Investment and Interest Income Recognized) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, average recorded investment	$ 33,483	$ 57,601
With no related allowance recorded, interest income recognized	127	113
With an allowance recorded, average recorded investment	8,031	16,357
With an allowance recorded, interest income recognized	51	17
Impaired Financing Receivable, Average Recorded Investment	41,514	73,958
Impaired Financing Receivable, Interest Income, Cash Basis Method	178	130
Commercial and agricultural [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, average recorded investment	242	886
With no related allowance recorded, interest income recognized	0	0
With an allowance recorded, average recorded investment	0	917
With an allowance recorded, interest income recognized	0	5
Impaired Financing Receivable, Average Recorded Investment	242	1,803
Impaired Financing Receivable, Interest Income, Cash Basis Method	0	5
Real estate - construction [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, average recorded investment	2,688	9,233
With no related allowance recorded, interest income recognized	10	0
With an allowance recorded, average recorded investment	650	2,111
With an allowance recorded, interest income recognized	2	0
Impaired Financing Receivable, Average Recorded Investment	3,338	11,344
Impaired Financing Receivable, Interest Income, Cash Basis Method	12	0
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, average recorded investment	9,050	13,472
With no related allowance recorded, interest income recognized	28	26
With an allowance recorded, average recorded investment	3,829	4,666
With an allowance recorded, interest income recognized	19	8
Impaired Financing Receivable, Average Recorded Investment	12,879	18,138
Impaired Financing Receivable, Interest Income, Cash Basis Method	47	34
Real estate - mortgage, commercial [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, average recorded investment	21,503	34,010
With no related allowance recorded, interest income recognized	89	87
With an allowance recorded, average recorded investment	3,552	8,663
With an allowance recorded, interest income recognized	30	4
Impaired Financing Receivable, Average Recorded Investment	25,055	42,673
Impaired Financing Receivable, Interest Income, Cash Basis Method	119	91
Consumer [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, average recorded investment	0	0
With no related allowance recorded, interest income recognized	0	0
With an allowance recorded, average recorded investment	0	0
With an allowance recorded, interest income recognized	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0
Impaired Financing Receivable, Interest Income, Cash Basis Method	$ 0	$ 0