FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Assets measured at Fair Value
Trading securities	$ 100	$ 100
Available-for-sale securities	1,211,759	1,132,064
Treasuries \| Fair value measured on recurring basis \| Significant Other Observable Inputs (Level 2)
Assets measured at Fair Value
Available-for-sale securities	21,975	15,824
Treasuries \| Fair value measured on recurring basis \| Total
Assets measured at Fair Value
Available-for-sale securities	21,975	15,824
Agencies \| Fair value measured on recurring basis \| Significant Other Observable Inputs (Level 2)
Assets measured at Fair Value
Available-for-sale securities	166,617	102,213
Agencies \| Fair value measured on recurring basis \| Total
Assets measured at Fair Value
Available-for-sale securities	166,617	102,213
Mortgage-backed \| Fair value measured on recurring basis \| Significant Other Observable Inputs (Level 2)
Assets measured at Fair Value
Trading securities	8	15
Available-for-sale securities	256,073	254,141
Mortgage-backed \| Fair value measured on recurring basis \| Total
Assets measured at Fair Value
Trading securities	8	15
Available-for-sale securities	256,073	254,141
ABS/CMO \| Fair value measured on recurring basis \| Significant Other Observable Inputs (Level 2)
Assets measured at Fair Value
Available-for-sale securities	62,584	49,915
ABS/CMO \| Fair value measured on recurring basis \| Total
Assets measured at Fair Value
Available-for-sale securities	62,584	49,915
Municipals \| Fair value measured on recurring basis \| Significant Other Observable Inputs (Level 2)
Assets measured at Fair Value
Available-for-sale securities	244,151	237,038
Municipals \| Fair value measured on recurring basis \| Total
Assets measured at Fair Value
Available-for-sale securities	244,151	237,038
Equity \| Fair value measured on recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets measured at Fair Value
Available-for-sale securities	331,301	321,897
Equity \| Fair value measured on recurring basis \| Total
Assets measured at Fair Value
Available-for-sale securities	331,301	321,897
Fair value measured on recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets measured at Fair Value
Available-for-sale securities	331,301	321,897
Total assets at fair value	331,301	321,897
Fair value measured on recurring basis \| Significant Other Observable Inputs (Level 2)
Assets measured at Fair Value
Trading securities	8	15
Available-for-sale securities	1,211,759	1,132,064
Total assets at fair value	1,211,767	1,132,079
Fair value measured on recurring basis \| Significant Other Observable Inputs (Level 2) \| Corporates
Assets measured at Fair Value
Available-for-sale securities	460,359	472,933
Fair value measured on recurring basis \| Total
Assets measured at Fair Value
Trading securities	8	15
Available-for-sale securities	1,543,060	1,453,961
Total assets at fair value	1,543,068	1,453,976
Fair value measured on recurring basis \| Total \| Corporates
Assets measured at Fair Value
Available-for-sale securities	$ 460,359	$ 472,933

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.

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 Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected.

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