ALLOWANCE FOR CREDIT LOSSES (Changes In The Allowance For Credit Losses By Segment And Class) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Changes in the allowance for credit losses [Roll Forward]
Balance at beginning of period			$ 164,466	$ 195,118	$ 195,118
Charge-offs			(33,864)	(69,674)	(89,398)
Recoveries			15,872	21,575	30,746
Provision	500	6,000	7,500	22,000	28,000
Balance at end of period	153,974	169,019	153,974	169,019	164,466
Commercial and industrial segment [Member]
Changes in the allowance for credit losses [Roll Forward]
Balance at beginning of period			23,286	20,724	20,724
Charge-offs			(3,835)	(10,188)	(12,362)
Recoveries			2,156	3,589	7,096
Provision			(2,275)	7,580	7,828
Balance at end of period	19,332	21,705	19,332	21,705	23,286
Real estate segment [Member] | Consumer mortgages [Member]
Changes in the allowance for credit losses [Roll Forward]
Balance at beginning of period			35,966	36,529	36,529
Charge-offs			(7,724)	(9,333)	(13,122)
Recoveries			3,332	1,017	1,836
Provision			4,793	3	10,723
Balance at end of period	36,367	28,216	36,367	28,216	35,966
Real estate segment [Member] | Home equity [Member]
Changes in the allowance for credit losses [Roll Forward]
Balance at beginning of period			6,005	8,630	8,630
Charge-offs			(1,182)	(1,657)	(2,721)
Recoveries			510	430	496
Provision			327	(1,482)	(400)
Balance at end of period	5,660	5,921	5,660	5,921	6,005
Real estate segment [Member] | Agricultural [Member]
Changes in the allowance for credit losses [Roll Forward]
Balance at beginning of period			3,301	3,921	3,921
Charge-offs			(498)	(784)	(1,240)
Recoveries			181	116	126
Provision			(182)	(599)	494
Balance at end of period	2,802	2,654	2,802	2,654	3,301
Real estate segment [Member] | Commercial and industrial-owner occupied [Member]
Changes in the allowance for credit losses [Roll Forward]
Balance at beginning of period			20,178	21,929	21,929
Charge-offs			(2,814)	(7,594)	(9,015)
Recoveries			1,990	2,135	2,696
Provision			(1,640)	2,849	4,568
Balance at end of period	17,714	19,319	17,714	19,319	20,178
Real estate segment [Member] | Construction, acquisition and development [Member]
Changes in the allowance for credit losses [Roll Forward]
Balance at beginning of period			21,905	45,562	45,562
Charge-offs			(4,961)	(27,799)	(33,085)
Recoveries			2,199	6,786	8,407
Provision			(6,218)	7,993	1,021
Balance at end of period	12,925	32,542	12,925	32,542	21,905
Real estate segment [Member] | Commercial real estate [Member]
Changes in the allowance for credit losses [Roll Forward]
Balance at beginning of period			40,081	39,444	39,444
Charge-offs			(9,302)	(8,702)	(12,728)
Recoveries			4,194	6,330	8,538
Provision			9,815	5,099	4,827
Balance at end of period	44,788	42,171	44,788	42,171	40,081
Credit cards segment [Member]
Changes in the allowance for credit losses [Roll Forward]
Balance at beginning of period			3,611	4,021	4,021
Charge-offs			(1,757)	(1,690)	(2,221)
Recoveries			496	383	527
Provision			1,232	455	1,284
Balance at end of period	3,582	3,169	3,582	3,169	3,611
All other [Member]
Changes in the allowance for credit losses [Roll Forward]
Balance at beginning of period			10,133	14,358	14,358
Charge-offs			(1,791)	(1,927)	(2,904)
Recoveries			814	789	1,024
Provision			1,648	102	(2,345)
Balance at end of period	$ 10,804	$ 13,322	$ 10,804	$ 13,322	$ 10,133