DERIVATIVE INSTRUMENTS AND OFFSETTING ASSETS AND LIABILITIES (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Forward Commitments [Member]
Derivative [Line Items]
Notional amount	$ 314,700	$ 280,800	$ 314,700	$ 280,800
Difference in carrying value and fair value, reflecting a loss	3,600
Difference in carrying value and fair value, reflecting a gain		2,200
Fixed Rate Mortgage Loans [Member]
Derivative [Line Items]
Notional amount	253,000	184,900	253,000	184,900
Difference in carrying value and fair value, reflecting a gain			8,800	4,500
Loan/Lease Interest Rate Swaps [Member]
Derivative [Line Items]
Notional amount	$ 236,800	$ 288,700	$ 236,800	$ 288,700
Average maturity			37 months	44 months
Average interest receive rate	2.70%	2.50%	2.70%	2.50%
Average interest pay rate	5.60%	5.60%	5.60%	5.60%