LOANS AND LEASES (Non-Performing Loans And Leases) (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 10,658,761	$ 10,372,778	$ 10,219,576
Non-accrual loans and leases	$ 70,725	83,028	70,237
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	$ 70,725	83,028	70,237
Total	90,916	94,917	90,251
Non-Performing [Member] | 90+ Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Still accruing	2,255	2,013	1,436
Non-Performing [Member] | Restructured Loans And Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Still accruing	17,936	9,876	18,578
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,616,152	1,747,774
Non-accrual loans and leases	11,659	8,493	15,697
Real Estate [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,611,387	2,472,202
Non-accrual loans and leases	20,196	21,637	21,959
Real Estate [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	622,566	589,752
Non-accrual loans and leases	3,721	4,021	3,664
Real Estate [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	242,171	259,360
Non-accrual loans and leases	1,194	921	484
Real Estate [Member] | Commercial And Industrial - Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,668,477	1,617,429
Non-accrual loans and leases	11,983	16,512	12,690
Real Estate [Member] | Construction, Acquisition And Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,121,386	945,045
Non-accrual loans and leases	6,939	9,130	4,240
Real Estate [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	2,240,717	2,188,048
Non-accrual loans and leases	14,793	21,741	10,730
Credit Cards [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	107,447	112,165
Non-accrual loans and leases	121	188	215
All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	428,458	441,003
Non-accrual loans and leases	$ 119	$ 385	$ 558