INVESTMENTS (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Available-for-sale
Cost or Amortized Cost	$ 1,243,615	$ 1,085,728
Gross Unrealized Gains	71,164	64,234
Gross Unrealized Losses	(1,940)	(3,645)
Fair Value	1,312,839	1,146,317
Held-to-maturity
Amortized Cost/Carrying Value	91,623	260,226
Gross Unrecognized Gains	419	1,219
Gross Unrecognized Losses	(6)	(464)
Fair Value	92,036	260,981
U.S. Agency
Available-for-sale
Cost or Amortized Cost	24,142	112,975
Gross Unrealized Gains	252	844
Gross Unrealized Losses	(1)
Fair Value	24,393	113,819
Held-to-maturity
Amortized Cost/Carrying Value	89,970	243,571
Gross Unrecognized Gains	314	1,085
Gross Unrecognized Losses	(6)
Fair Value	90,278	244,656
Corporate
Available-for-sale
Cost or Amortized Cost	512,298	439,079
Gross Unrealized Gains	36,243	31,640
Gross Unrealized Losses	(1,190)	(3,619)
Fair Value	547,351	467,100
Held-to-maturity
Amortized Cost/Carrying Value		15,000
Gross Unrecognized Losses		(464)
Fair Value		14,536
Mortgage-backed
Available-for-sale
Cost or Amortized Cost	250,903	233,134
Gross Unrealized Gains	16,664	15,852
Gross Unrealized Losses	(1)
Fair Value	267,566	248,986
ABS/CMO
Available-for-sale
Cost or Amortized Cost	84,328	54,325
Gross Unrealized Gains	3,016	2,628
Gross Unrealized Losses	(18)
Fair Value	87,326	56,953
Non-U.S. govt. & agency
Available-for-sale
Cost or Amortized Cost	8,408	6,403
Gross Unrealized Gains	653	294
Fair Value	9,061	6,697
U.S. Government
Available-for-sale
Cost or Amortized Cost	16,018	15,721
Gross Unrealized Gains	391	459
Gross Unrealized Losses	(9)	(8)
Fair Value	16,400	16,172
States, political subdivisions, and revenues
Available-for-sale
Cost or Amortized Cost	347,518	224,091
Gross Unrealized Gains	13,945	12,517
Gross Unrealized Losses	(721)	(18)
Fair Value	360,742	236,590
Held-to-maturity
Amortized Cost/Carrying Value	1,653	1,655
Gross Unrecognized Gains	105	134
Fair Value	1,758	1,789
Equities
Available-for-sale
Cost or Amortized Cost	269,301	269,400
Gross Unrealized Gains	138,727	121,833
Gross Unrealized Losses	(1,954)	(2,544)
Fair Value	$ 406,074	$ 388,689

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity. The held-to-maturity category is for those securities that the entity has the positive intent and ability to hold until maturity.

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This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity.

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As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain.

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As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss.

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