LOANS AND LEASES (Loan And Lease Portfolio, Net Of Unearned Income, By Segment, Class And Internally Assigned Grade) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Total	$ 11,055,509	$ 10,811,991	$ 10,658,761
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	10,785,671
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	7,400
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	241,722
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	839
Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	146
Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	19,731
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,506,352	1,612,295
Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,449,512	1,562,263
Commercial And Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	762
Commercial And Industrial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	50,633	41,618
Commercial And Industrial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	290	100
Commercial And Industrial [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	146
Commercial And Industrial [Member] | Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,009	8,314
Real Estate [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,826,333	2,643,966
Real Estate [Member] | Consumer Mortgages [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,768,161	2,579,905
Real Estate [Member] | Consumer Mortgages [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total		522
Real Estate [Member] | Consumer Mortgages [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	55,836	61,602
Real Estate [Member] | Consumer Mortgages [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	272	282
Real Estate [Member] | Consumer Mortgages [Member] | Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,064	1,655
Real Estate [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	626,961	628,846
Real Estate [Member] | Home Equity [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	617,463	616,758
Real Estate [Member] | Home Equity [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	8,731	11,231
Real Estate [Member] | Home Equity [Member] | Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	767	857
Real Estate [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	247,211	245,377
Real Estate [Member] | Agricultural [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	234,563	233,939
Real Estate [Member] | Agricultural [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	7,372	10,577
Real Estate [Member] | Agricultural [Member] | Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,276	861
Real Estate [Member] | Commercial And Industrial - Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,835,430	1,764,265
Real Estate [Member] | Commercial And Industrial - Owner Occupied [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,766,055	1,705,266
Real Estate [Member] | Commercial And Industrial - Owner Occupied [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,920	3,668
Real Estate [Member] | Commercial And Industrial - Owner Occupied [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	62,232	47,010
Real Estate [Member] | Commercial And Industrial - Owner Occupied [Member] | Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	4,223	8,321
Real Estate [Member] | Construction, Acquisition And Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,175,979	1,157,248
Real Estate [Member] | Construction, Acquisition And Development [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,159,359	1,135,618
Real Estate [Member] | Construction, Acquisition And Development [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,718
Real Estate [Member] | Construction, Acquisition And Development [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	12,902	15,697
Real Estate [Member] | Construction, Acquisition And Development [Member] | Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total		5,933
Real Estate [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,336,219	2,237,719
Real Estate [Member] | Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,293,845	2,179,318
Real Estate [Member] | Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total		634
Real Estate [Member] | Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	39,805	45,471
Real Estate [Member] | Commercial Real Estate [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	177
Real Estate [Member] | Commercial Real Estate [Member] | Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,392	12,296
Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	104,613	109,656
Credit Cards [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	104,613	109,656
All Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	396,411	412,619
All Other [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	392,100	405,611
All Other [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	4,211	$ 7,008
All Other [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 100