Loans and Allowance for Loan Losses (Loans Sold) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 loans	Dec. 31, 2011 loans
Financing Receivable [Line Items]
Number of loans sold	2	80
Recorded investment of loans sold	$ 3,950	$ 65,929
Contract pricing of loans sold	4,200	43,469
Commercial and agricultural [Member]
Financing Receivable [Line Items]
Number of loans sold	0	12
Recorded investment of loans sold	0	4,576
Contract pricing of loans sold	0	1,523
Real estate - construction [Member]
Financing Receivable [Line Items]
Number of loans sold	0	15
Recorded investment of loans sold	0	35,984
Contract pricing of loans sold	0	21,227
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable [Line Items]
Number of loans sold	0	10
Recorded investment of loans sold	0	4,962
Contract pricing of loans sold	0	4,059
Real estate - mortgage, commercial [Member]
Financing Receivable [Line Items]
Number of loans sold	2	42
Recorded investment of loans sold	3,950	20,217
Contract pricing of loans sold	4,200	16,660
Consumer [Member]
Financing Receivable [Line Items]
Number of loans sold	0	1
Recorded investment of loans sold	0	190
Contract pricing of loans sold	$ 0	$ 0