Loans and the Allowance for Loan Losses (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Investment and interest income recognized on impaired loans
Average Recorded Investment	$ 153,127	$ 204,802	$ 163,067	$ 206,428
Interest Income Recognized	1,568	1,138	3,258	3,480
Commercial, financial, agricultural [Member]
Investment and interest income recognized on impaired loans
Average Recorded Investment	3,474	5,006	3,610	4,674
Interest Income Recognized	25	75	41	100
Lease financing [Member]
Investment and interest income recognized on impaired loans
Average Recorded Investment
Interest Income Recognized
Real estate - construction [Member]
Investment and interest income recognized on impaired loans
Average Recorded Investment	2,086	12,909	2,087	13,801
Interest Income Recognized	6		6
Real estate - 1-4 family mortgage [Member]
Investment and interest income recognized on impaired loans
Average Recorded Investment	58,104	68,924	62,320	67,322
Interest Income Recognized	917	331	1,515	1,248
Real estate - commercial mortgage [Member]
Investment and interest income recognized on impaired loans
Average Recorded Investment	89,463	117,963	95,050	120,631
Interest Income Recognized	620	732	1,696	2,132
Installment loans to individuals [Member]
Investment and interest income recognized on impaired loans
Average Recorded Investment
Interest Income Recognized