DERIVATIVE INSTRUMENTS AND OFFSETTING ASSETS AND LIABILITIES (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Forward Commitments [Member]
Derivative [Line Items]
Notional amount	$ 212,700	$ 255,200	$ 212,700	$ 255,200
Difference in carrying value and fair value, reflecting a loss		1,800
Difference in carrying value and fair value, reflecting a gain	804
Fixed Rate Mortgage Loans [Member]
Derivative [Line Items]
Notional amount	173,100	216,500	173,100	216,500
Difference in carrying value and fair value, reflecting a gain		6,400	5,600
Loan/Lease Interest Rate Swaps [Member]
Derivative [Line Items]
Notional amount	$ 207,500	$ 243,200	$ 207,500	$ 243,200
Average maturity			27 months	39 months
Average interest receive rate	3.10%	2.70%	3.10%	2.70%
Average interest pay rate	5.70%	5.60%	5.70%	5.60%