ALLOWANCE FOR CREDIT LOSSES (Changes In The Allowance For Credit Losses By Segment And Class) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		$ 142,443	$ 153,236	$ 153,236
Charge-offs		(17,171)	(20,175)	(25,027)
Recoveries		20,737	10,889	14,234
Provision	$ (3,000)	(13,000)
Balance at end of period	133,009	133,009	143,950	142,443
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		21,419	18,376	18,376
Charge-offs		(3,829)	(1,367)	(2,546)
Recoveries		1,681	2,000	2,298
Provision		4,559	2,319	3,291
Balance at end of period	23,830	23,830	21,328	21,419
Consumer Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		40,015	39,525	39,525
Charge-offs		(2,849)	(5,137)	(6,037)
Recoveries		2,113	2,446	3,267
Provision		(5,635)	4,594	3,260
Balance at end of period	33,644	33,644	41,428	40,015
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		9,542	5,663	5,663
Charge-offs		(1,057)	(1,266)	(1,359)
Recoveries		516	523	625
Provision		(1,039)	4,720	4,613
Balance at end of period	7,962	7,962	9,640	9,542
Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		3,420	2,800	2,800
Charge-offs		(17)	(761)	(765)
Recoveries		364	80	96
Provision		(1,252)	1,579	1,289
Balance at end of period	2,515	2,515	3,698	3,420
Commercial And Industrial - Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		16,325	17,059	17,059
Charge-offs		(1,443)	(3,371)	(3,591)
Recoveries		2,527	896	1,112
Provision		(2,452)	2,673	1,745
Balance at end of period	14,957	14,957	17,257	16,325
Construction, Acquisition And Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		9,885	11,828	11,828
Charge-offs		(818)	(3,165)	(3,731)
Recoveries		10,666	2,837	3,734
Provision		(8,933)	(1,326)	(1,946)
Balance at end of period	10,800	10,800	10,174	9,885
Credit Cards [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		6,514	3,782	3,782
Charge-offs		(1,909)	(1,779)	(2,359)
Recoveries		506	382	542
Provision		(221)	3,470	4,549
Balance at end of period	4,890	4,890	5,855	6,514
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		23,562	43,853	43,853
Charge-offs		(3,601)	(1,332)	(1,795)
Recoveries		1,507	835	1,458
Provision		3,637	(20,155)	(19,954)
Balance at end of period	25,105	25,105	23,201	23,562
All Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period		11,761	10,350	10,350
Charge-offs		(1,648)	(1,997)	(2,844)
Recoveries		857	890	1,102
Provision		(1,664)	2,126	3,153
Balance at end of period	$ 9,306	$ 9,306	$ 11,369	$ 11,761