FAIR VALUE ACCOUNTING AND MEASUREMENT (Unobservable Inputs Rollforward) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Junior Subordinated Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 84,694	$ 77,313	$ 78,001	$ 73,928
Liabilities (gains) losses	489	311	1,223	3,696
Purchases, issuances and settlements, including the Siuslaw acquisition	0		5,959
Sales, maturities and paydowns, net of discount amortization	0	0	0	0
Ending balance	85,183	77,624	85,183	77,624
TPS and TRUP CDOs [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	12,571	38,529	19,119	35,140
Assets gains (losses), including OTTI	(596)	1,969	1,475	5,389
Purchases, issuances and settlements, including the Siuslaw acquisition	6,338		6,338
Sales, maturities and paydowns, net of discount amortization	27	(11,485)	(8,592)	(11,516)
Ending balance	$ 18,340	$ 29,013	$ 18,340	$ 29,013