Impaired Loans and Valuation Allowance for Loan Losses (Details 3) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Average Recorded Investment
Average Recorded Investment, Total	$ 99,678	$ 124,821
Interest Income Recognized, Total	2,400	2,548
Construction and Land Development [Member]
Average Recorded Investment
Average Recorded Investment, With No Related Allowance	1,495	2,784
Average Recorded Investment, With Related Allowance	3,637	17,051
Average Recorded Investment, Total	5,132	19,835
Interest Income Recognized, With No Related Allowance	1	15
Interest Income Recognized, With Related Allowance	98	108
Interest Income Recognized, Total	99	123
Commercial Real Estate [Member]
Average Recorded Investment
Average Recorded Investment, With No Related Allowance	11,831	22,062
Average Recorded Investment, With Related Allowance	42,769	44,690
Average Recorded Investment, Total	54,600	66,752
Interest Income Recognized, With No Related Allowance	326	302
Interest Income Recognized, With Related Allowance	1,204	1,369
Interest Income Recognized, Total	1,530	1,671
Residential Real Estate [Member]
Average Recorded Investment
Average Recorded Investment, With No Related Allowance	11,608	8,737
Average Recorded Investment, With Related Allowance	27,223	27,148
Average Recorded Investment, Total	38,831	35,885
Interest Income Recognized, With No Related Allowance	129	77
Interest Income Recognized, With Related Allowance	617	642
Interest Income Recognized, Total	746	719
Commercial and Financial [Member]
Average Recorded Investment
Average Recorded Investment, With No Related Allowance	9	1,026
Average Recorded Investment, With Related Allowance	38	172
Average Recorded Investment, Total	47	1,198
Interest Income Recognized, With No Related Allowance	0	2
Interest Income Recognized, With Related Allowance	8	2
Interest Income Recognized, Total	8	4
Consumer [Member]
Average Recorded Investment
Average Recorded Investment, With No Related Allowance	463	397
Average Recorded Investment, With Related Allowance	605	754
Average Recorded Investment, Total	1,068	1,151
Interest Income Recognized, With No Related Allowance	0	2
Interest Income Recognized, With Related Allowance	17	29
Interest Income Recognized, Total	$ 17	$ 31