Loans and the Allowance for Loan Losses (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012		Sep. 30, 2013	Sep. 30, 2012
Investment and interest income recognized on impaired loans
Average Recorded Investment	$ 114,419	$ 153,127		$ 115,951	$ 163,067
Interest Income Recognized	541	1,568	[1]	1,298	3,258	[1]
Commercial, financial, agricultural [Member]
Investment and interest income recognized on impaired loans
Average Recorded Investment	5,183	3,474		5,123	3,610
Interest Income Recognized	4	25	[1]	4	41	[1]
Lease financing [Member]
Investment and interest income recognized on impaired loans
Average Recorded Investment	0	0		0	0
Interest Income Recognized	0	0	[1]	0	0	[1]
Real estate - construction [Member]
Investment and interest income recognized on impaired loans
Average Recorded Investment	1,650	2,086		1,650	2,087
Interest Income Recognized	0	6	[1]	0	6	[1]
Real estate - 1-4 family mortgage [Member]
Investment and interest income recognized on impaired loans
Average Recorded Investment	32,274	58,104		33,181	62,320
Interest Income Recognized	158	917	[1]	449	1,515	[1]
Real estate - commercial mortgage [Member]
Investment and interest income recognized on impaired loans
Average Recorded Investment	75,312	89,463		75,997	95,050
Interest Income Recognized	379	620	[1]	845	1,696	[1]
Installment loans to individuals [Member]
Investment and interest income recognized on impaired loans
Average Recorded Investment	0	0		0	0
Interest Income Recognized	$ 0	$ 0	[1]	$ 0	$ 0	[1]

[1] Includes interest income recognized using the cash-basis method of income recognition of $814. No interest income was recognized using the cash-basis method of income recognition during the three months ended September 30, 2013.