Loans and Leases - Reserve for Loan and Lease Losses Roll Forward (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance				$ 29,870				$ 30,898	$ 29,870	$ 30,898	$ 24,798
Charge-offs*									(16,735)	(19,703)	(17,105)
Recoveries									1,576	1,196	1,640
Provision (recovery of provision)	2,382	2,210	1,343	4,100	3,140	3,649	5,556	5,134	10,035	17,479	21,565
Ending balance	24,746				29,870				24,746	29,870	30,898
Commercial, financial and agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance				11,262				9,630	11,262	9,630
Charge-offs*									(9,974)	(6,784)
Recoveries									484	318
Provision (recovery of provision)									9,822	8,098
Ending balance	11,594				11,262				11,594	11,262
Real Estate - Commercial and Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance				13,317				15,288	13,317	15,288
Charge-offs*									(4,803)	(10,033)
Recoveries									334	151
Provision (recovery of provision)									(1,341)	7,911
Ending balance	7,507				13,317				7,507	13,317
Real Estate - Residential Secured for Business Purpose [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance				823				1,333	823	1,333
Charge-offs*										(323)
Recoveries									60	43
Provision (recovery of provision)									(244)	(230)
Ending balance	639				823				639	823
Real Estate - Residential and Home Equity Secured for Personal Purpose [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance				735				544	735	544
Charge-offs*									(156)	(79)
Recoveries									7	19
Provision (recovery of provision)									394	251
Ending balance	980				735				980	735
Loans to individuals [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance				730				734	730	734
Charge-offs*									(578)	(968)
Recoveries									130	174
Provision (recovery of provision)									397	790
Ending balance	679				730				679	730
Lease financings [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance				1,344				1,950	1,344	1,950
Charge-offs*									(1,224)	(1,516)
Recoveries									561	491
Provision (recovery of provision)									645	419
Ending balance	1,326				1,344				1,326	1,344
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance				1,659				1,419	1,659	1,419
Provision (recovery of provision)									362	240
Ending balance	$ 2,021				$ 1,659				$ 2,021	$ 1,659