LOANS AND LEASES (Non-Performing Loans And Leases) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 10,575,978	$ 10,372,778	$ 10,007,571
Non-accrual loans and leases	$ 68,638	83,028	67,766
Days past due of principal or interest at which loans and leases may be placed in non-accrual status	90 days
Non-Performing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans and leases	$ 68,638	83,028	67,766
Total	80,200	94,917	79,443
Non-Performing [Member] | 90+ Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Still accruing	1,875	2,013	1,568
Non-Performing [Member] | Restructured Loans And Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Still accruing	9,687	9,876	10,109
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,698,089	1,747,774
Non-accrual loans and leases	8,675	8,493	9,740
Real Estate [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,549,989	2,472,202
Non-accrual loans and leases	19,309	21,637	21,636
Real Estate [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	614,686	589,752
Non-accrual loans and leases	2,734	4,021	3,550
Real Estate [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	251,566	259,360
Non-accrual loans and leases	1,107	921	259
Real Estate [Member] | Commercial And Industrial - Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,644,618	1,617,429
Non-accrual loans and leases	16,021	16,512	14,007
Real Estate [Member] | Construction, Acquisition And Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,021,218	945,045
Non-accrual loans and leases	6,086	9,130	5,411
Real Estate [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,254,653	2,188,048
Non-accrual loans and leases	14,197	21,741	12,397
Credit Cards [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	108,101	112,165
Non-accrual loans and leases	159	188	157
All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	433,058	441,003
Non-accrual loans and leases	$ 350	$ 385	$ 609