Loans and Leases - Reserve for Loan and Lease Losses Roll Forward (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 30,597	$ 32,804	$ 29,870	$ 30,898
Charge-offs	(2,022)	(5,977)	(5,728)	(9,525)
Recoveries	584	218	917	538
Provision (recovery of provision)	1,343	5,556	5,443	10,690
Ending balance	30,502	32,601	30,502	32,601
Commercial, financial and agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	11,701	11,098	11,262	9,630
Charge-offs	(1,458)	(1,644)	(3,165)	(2,774)
Recoveries	362	49	415	181
Provision (recovery of provision)	1,416	1,374	3,509	3,840
Ending balance	12,021	10,877	12,021	10,877
Real Estate - Commercial and Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	13,352	16,464	13,317	15,288
Charge-offs	(133)	(3,375)	(1,675)	(5,063)
Recoveries	44	17	140	80
Provision (recovery of provision)	(947)	2,986	534	5,787
Ending balance	12,316	16,092	12,316	16,092
Real Estate - Residential Secured for Business Purpose [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	948	995	823	1,333
Charge-offs		(136)		(194)
Recoveries	3	3	55	6
Provision (recovery of provision)	(117)	157	(44)	(126)
Ending balance	834	1,019	834	1,019
Real Estate - Residential and Home Equity Secured for Personal Purpose [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	732	594	735	544
Charge-offs	(2)	(35)	(2)	(38)
Recoveries	1	1	3	3
Provision (recovery of provision)	153	136	148	187
Ending balance	884	696	884	696
Loans to individuals [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	704	701	730	734
Charge-offs	(119)	(396)	(240)	(597)
Recoveries	26	34	57	78
Provision (recovery of provision)	108	356	172	480
Ending balance	719	695	719	695
Lease Financings [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	1,160	1,946	1,344	1,950
Charge-offs	(310)	(391)	(646)	(859)
Recoveries	148	114	247	190
Provision (recovery of provision)	163	243	216	631
Ending balance	1,161	1,912	1,161	1,912
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	2,000	1,006	1,659	1,419
Provision (recovery of provision)	567	304	908	(109)
Ending balance	$ 2,567	$ 1,310	$ 2,567	$ 1,310