Loans (Loans Sold) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012 loans	Sep. 30, 2011 loans	Sep. 30, 2012 loans	Sep. 30, 2011 loans	Dec. 31, 2011
Financing Receivable [Line Items]
Net deferred loan premiums (discounts)	$ (2,600,000)		$ (2,600,000)		$ 1,800,000
Unpaid principal balance for loans serviced for others	33,600,000		33,600,000		2,000,000
Number of loans sold	1	23	9	37
Recorded investment of loans sold	602,000	13,442,000	6,267,000	33,730,000
Contract pricing of loans sold	540,000	11,194,000	6,486,000	26,365,000
Commercial and agricultural [Member]
Financing Receivable [Line Items]
Number of loans sold	0	9	0	14
Recorded investment of loans sold	0	217,000	0	3,505,000
Contract pricing of loans sold	0	1,238,000	0	3,190,000
Real estate - construction [Member]
Financing Receivable [Line Items]
Number of loans sold	0	8	0	13
Recorded investment of loans sold	0	6,406,000	0	16,723,000
Contract pricing of loans sold	0	4,927,000	0	11,899,000
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable [Line Items]
Number of loans sold		0	7	1
Recorded investment of loans sold		0	1,865,000	1,335,000
Contract pricing of loans sold		0	1,896,000	900,000
Real estate - mortgage, commercial [Member]
Financing Receivable [Line Items]
Number of loans sold	1	5	2	8
Recorded investment of loans sold	602,000	6,723,000	4,402,000	12,071,000
Contract pricing of loans sold	540,000	4,839,000	4,590,000	10,186,000
Consumer [Member]
Financing Receivable [Line Items]
Number of loans sold	0	1	0	1
Recorded investment of loans sold	0	96,000	0	96,000
Contract pricing of loans sold	$ 0	$ 190,000	$ 0	$ 190,000