ALLOWANCE FOR CREDIT LOSSES (Changes In The Allowance For Credit Losses By Segment And Class) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in the allowance for credit losses [Roll Forward]
Balance at beginning of period	$ 153,236	$ 164,466	$ 195,118
Loans and leases charged off	(25,027)	(42,192)	(89,398)
Recoveries	14,234	23,462	30,746
Provision		7,500	28,000
Balance at end of period	142,443	153,236	164,466
Commercial And Industrial [Member]
Changes in the allowance for credit losses [Roll Forward]
Balance at beginning of period	18,376	23,286
Loans and leases charged off	(2,546)	(4,672)
Recoveries	2,298	3,517
Provision	3,291	(3,755)
Balance at end of period	21,419	18,376
Real Estate [Member] | Consumer Mortgages [Member]
Changes in the allowance for credit losses [Roll Forward]
Balance at beginning of period	39,525	35,966
Loans and leases charged off	(6,037)	(9,159)
Recoveries	3,267	5,067
Provision	3,260	7,651
Balance at end of period	40,015	39,525
Real Estate [Member] | Home Equity [Member]
Changes in the allowance for credit losses [Roll Forward]
Balance at beginning of period	5,663	6,005
Loans and leases charged off	(1,359)	(1,469)
Recoveries	625	607
Provision	4,613	520
Balance at end of period	9,542	5,663
Real Estate [Member] | Agricultural [Member]
Changes in the allowance for credit losses [Roll Forward]
Balance at beginning of period	2,800	3,301
Loans and leases charged off	(765)	(736)
Recoveries	96	215
Provision	1,289	20
Balance at end of period	3,420	2,800
Real Estate [Member] | Commercial And Industrial-Owner Occupied [Member]
Changes in the allowance for credit losses [Roll Forward]
Balance at beginning of period	17,059	20,178
Loans and leases charged off	(3,591)	(3,855)
Recoveries	1,112	2,724
Provision	1,745	(1,988)
Balance at end of period	16,325	17,059
Real Estate [Member] | Construction, Acquisition And Development [Member]
Changes in the allowance for credit losses [Roll Forward]
Balance at beginning of period	11,828	21,905
Loans and leases charged off	(3,731)	(6,745)
Recoveries	3,734	4,682
Provision	(1,946)	(8,014)
Balance at end of period	9,885	11,828
Real Estate [Member] | Commercial Real Estate [Member]
Changes in the allowance for credit losses [Roll Forward]
Balance at beginning of period	43,853	40,081
Loans and leases charged off	(1,795)	(10,341)
Recoveries	1,458	4,978
Provision	(19,954)	9,135
Balance at end of period	23,562	43,853
Credit Cards [Member]
Changes in the allowance for credit losses [Roll Forward]
Balance at beginning of period	3,782	3,611
Loans and leases charged off	(2,359)	(2,316)
Recoveries	542	629
Provision	4,549	1,858
Balance at end of period	6,514	3,782
All Other [Member]
Changes in the allowance for credit losses [Roll Forward]
Balance at beginning of period	10,350	10,133
Loans and leases charged off	(2,844)	(2,899)
Recoveries	1,102	1,043
Provision	3,153	2,073
Balance at end of period	$ 11,761	$ 10,350