DERIVATIVE INSTRUMENTS AND OFFSETTING ASSETS AND LIABILITIES (Offsetting Of Derivative Assets And Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Derivative [Line Items]
Gross Amount Recognized	$ 8,312	$ 15,876	$ 20,983
Gross Amount Offset
Net Amount Recognized	8,312	15,876	20,983
Financial Instruments
Financial Collateral Pledged
Net Amount	8,312	15,876	20,983
Gross Amount Recognized	425,832	463,625	484,137
Gross Amount Offset
Net Amount Recognized	425,832	463,625	484,137
Financial Instruments	(421,044)	(454,002)	(468,969)
Financial Collateral Pledged	(4,374)	(9,175)	(14,041)
Net Amount	414	448	1,127
Forward Commitments [Member]
Derivative [Line Items]
Gross Amount Recognized	3,938	6,701	6,942
Gross Amount Offset
Net Amount Recognized	3,938	6,701	6,942
Financial Instruments
Financial Collateral Pledged
Net Amount	3,938	6,701	6,942
Gross Amount Recognized	414	448	1,127
Gross Amount Offset
Net Amount Recognized	414	448	1,127
Financial Instruments
Financial Collateral Pledged
Net Amount	414	448	1,127
Loan/Lease Interest Rate Swaps [Member]
Derivative [Line Items]
Gross Amount Recognized	4,374	9,175	14,041
Gross Amount Offset
Net Amount Recognized	4,374	9,175	14,041
Financial Instruments
Financial Collateral Pledged
Net Amount	4,374	9,175	14,041
Gross Amount Recognized	4,374	9,175	14,041
Gross Amount Offset
Net Amount Recognized	4,374	9,175	14,041
Financial Instruments
Financial Collateral Pledged	(4,374)	(9,175)	(14,041)
Repurchase Arrangements [Member]
Derivative [Line Items]
Gross Amount Recognized	421,044	454,002	468,969
Gross Amount Offset
Net Amount Recognized	421,044	454,002	468,969
Financial Instruments	$ (421,044)	(454,002)	$ (468,969)
Financial Collateral Pledged