INVESTMENT SECURITIES (Gains (Losses) and Proceeds on Sale of Securities) (Details) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2014	Jun. 30, 2013
Available-for-sale Securities, Gross Realized Gain (Loss), Disclosures [Abstract]
Proceeds from the sales of available-for-sale securities	$ 201,768,000	$ 3,107,987,000		$ 289,881,000	$ 5,695,170,000
Gross realized gains	9,472,000	41,657,000		11,416,000	115,181,000
Gross realized losses	(67,000)	(18,984,000)		(67,000)	(18,986,000)
OTTI	0	(63,630,000)	0	0	(63,630,000)
Net realized gains/(losses)	9,405,000	(40,957,000)		11,349,000	32,565,000
State and municipal securities [Member]
Available-for-sale Securities, Gross Realized Gain (Loss), Disclosures [Abstract]
Investment securities sold during the period	89,000,000			89,000,000
Realized investment gain	5,200,000			5,200,000
Corporate debt securities [Member]
Available-for-sale Securities, Gross Realized Gain (Loss), Disclosures [Abstract]
Investment securities sold during the period	63,200,000			346,400,000	905,700,000
Realized investment gain	2,700,000			4,600,000	34,700,000
MBS [Member]
Available-for-sale Securities, Gross Realized Gain (Loss), Disclosures [Abstract]
Investment securities sold during the period	21,600,000			21,600,000
Realized investment gain	1,300,000			1,300,000
Collateralized mortgage obligations [Member]
Available-for-sale Securities, Gross Realized Gain (Loss), Disclosures [Abstract]
Investment securities sold during the period		2,700,000,000			4,100,000,000
Realized investment gain		$ 35,700,000			$ 69,000,000