Loans and Allowance for Loan Losses (Impaired Loans, Average Recorded Investment and Interest Income Recognized) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
With no related alowance recorded, average recorded investment	$ 71,121,000	$ 100,306,000
With no related allowance recorded, interest income recognized	624,000	27,000
With an allowance recorded, average recorded investment	17,301,000	112,543,000
With an allowance recorded, interest income recognized	522,000	7,000
Impaired Financing Receivable, Average Recorded Investment	88,422,000	212,849,000
Impaired Financing Receivable, Interest Income, Cash Basis Method	1,146,000	34,000
Financing Receivable, Modifications, Recorded Investment	20,800,000	28,300,000
Commercial and agricultural [Member]
Financing Receivable, Impaired [Line Items]
With no related alowance recorded, average recorded investment	1,989,000	3,202,000
With no related allowance recorded, interest income recognized	42,000	0
With an allowance recorded, average recorded investment	706,000	4,458,000
With an allowance recorded, interest income recognized	16,000	0
Impaired Financing Receivable, Average Recorded Investment	2,695,000	7,660,000
Impaired Financing Receivable, Interest Income, Cash Basis Method	58,000	0
Real estate - construction [Member]
Financing Receivable, Impaired [Line Items]
With no related alowance recorded, average recorded investment	15,130,000	41,164,000
With no related allowance recorded, interest income recognized	92,000	1,000
With an allowance recorded, average recorded investment	1,762,000	51,354,000
With an allowance recorded, interest income recognized	0	0
Impaired Financing Receivable, Average Recorded Investment	16,892,000	92,518,000
Impaired Financing Receivable, Interest Income, Cash Basis Method	92,000	1,000
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Impaired [Line Items]
With no related alowance recorded, average recorded investment	18,237,000	17,077,000
With no related allowance recorded, interest income recognized	204,000	1,000
With an allowance recorded, average recorded investment	1,764,000	15,740,000
With an allowance recorded, interest income recognized	61,000	7,000
Impaired Financing Receivable, Average Recorded Investment	20,001,000	32,817,000
Impaired Financing Receivable, Interest Income, Cash Basis Method	265,000	8,000
Real estate - mortgage, commercial [Member]
Financing Receivable, Impaired [Line Items]
With no related alowance recorded, average recorded investment	35,765,000	38,688,000
With no related allowance recorded, interest income recognized	286,000	25,000
With an allowance recorded, average recorded investment	13,069,000	40,777,000
With an allowance recorded, interest income recognized	445,000	0
Impaired Financing Receivable, Average Recorded Investment	48,834,000	79,465,000
Impaired Financing Receivable, Interest Income, Cash Basis Method	731,000	25,000
Consumer [Member]
Financing Receivable, Impaired [Line Items]
With no related alowance recorded, average recorded investment	0	175,000
With no related allowance recorded, interest income recognized	0	0
With an allowance recorded, average recorded investment	0	214,000
With an allowance recorded, interest income recognized	0	0
Impaired Financing Receivable, Average Recorded Investment	0	389,000
Impaired Financing Receivable, Interest Income, Cash Basis Method	0	0
PC [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 4,500,000	$ 2,900,000