DERIVATIVE INSTRUMENTS AND OFFSETTING ASSETS AND LIABILITIES (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Derivative [Line Items]
Difference in carrying value and fair value, reflecting a loss	$ 2,200
Forward Commitments [Member]
Derivative [Line Items]
Notional amount	280,800	$ 151,300
Difference in carrying value and fair value, reflecting a loss		1,000
Difference in carrying value and fair value, reflecting a gain	2,200
Loan/Lease Interest Rate Swaps [Member]
Derivative [Line Items]
Notional amount	$ 288,700	$ 352,700
Average maturity	44 months	53 months
Average interest receive rate	2.50%	2.50%
Average interest pay rate	5.60%	5.60%
Fixed Rate Mortgages [Member]
Derivative [Line Items]
Notional amount	$ 184,900	$ 114,200
Difference in carrying value and fair value, reflecting a gain	$ 4,500	$ 3,500