ALLOWANCE FOR CREDIT LOSSES (Allowance For Credit Losses By Segment, Class And Impairment Status) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Recorded balance of impaired loans	$ 79,745,000	$ 156,728,000
Allowance for impaired loans and leases	3,843,000	10,541,000
Allowance for all other loans and leases	150,131,000	153,925,000
Total allowance	153,974,000	164,466,000	169,019,000	195,118,000
Evaluated for impairment threshold	500,000
Construction, acquisition and development [Member]
Financing Receivable, Impaired [Line Items]
Recorded balance of impaired loans	23,186,000	61,335,000
Allowance for impaired loans and leases	1,637,000	4,350,000
Commercial and industrial segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded balance of impaired loans	2,861,000	4,845,000
Allowance for impaired loans and leases	283,000	1,241,000
Allowance for all other loans and leases	19,049,000	22,045,000
Total allowance	19,332,000	23,286,000	21,705,000	20,724,000
Real estate segment [Member] | Consumer mortgages [Member]
Financing Receivable, Impaired [Line Items]
Recorded balance of impaired loans	9,660,000	15,107,000
Allowance for impaired loans and leases	489,000	1,103,000
Allowance for all other loans and leases	35,878,000	34,863,000
Total allowance	36,367,000	35,966,000	28,216,000	36,529,000
Real estate segment [Member] | Home equity [Member]
Financing Receivable, Impaired [Line Items]
Recorded balance of impaired loans	1,305,000	1,380,000
Allowance for impaired loans and leases	23,000	111,000
Allowance for all other loans and leases	5,637,000	5,894,000
Total allowance	5,660,000	6,005,000	5,921,000	8,630,000
Real estate segment [Member] | Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Recorded balance of impaired loans	3,622,000	5,382,000
Allowance for impaired loans and leases		92,000
Allowance for all other loans and leases	2,802,000	3,209,000
Total allowance	2,802,000	3,301,000	2,654,000	3,921,000
Real estate segment [Member] | Commercial and industrial-owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Recorded balance of impaired loans	12,742,000	16,720,000
Allowance for impaired loans and leases	1,119,000	864,000
Allowance for all other loans and leases	16,595,000	19,314,000
Total allowance	17,714,000	20,178,000	19,319,000	21,929,000
Real estate segment [Member] | Construction, acquisition and development [Member]
Financing Receivable, Impaired [Line Items]
Recorded balance of impaired loans	23,186,000	61,335,000
Allowance for impaired loans and leases	1,637,000	4,350,000
Allowance for all other loans and leases	11,288,000	17,555,000
Total allowance	12,925,000	21,905,000	32,542,000	45,562,000
Real estate segment [Member] | Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded balance of impaired loans	25,886,000	50,413,000
Allowance for impaired loans and leases	292,000	2,720,000
Allowance for all other loans and leases	44,496,000	37,361,000
Total allowance	44,788,000	40,081,000	42,171,000	39,444,000
Credit cards segment [Member]
Financing Receivable, Impaired [Line Items]
Allowance for all other loans and leases	3,582,000	3,611,000
Total allowance	3,582,000	3,611,000	3,169,000	4,021,000
All other [Member]
Financing Receivable, Impaired [Line Items]
Recorded balance of impaired loans	483,000	1,546,000
Allowance for impaired loans and leases		60,000
Allowance for all other loans and leases	10,804,000	10,073,000
Total allowance	$ 10,804,000	$ 10,133,000	$ 13,322,000	$ 14,358,000