FAIR VALUE MEASUREMENTS (Details) (USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2013	Dec. 31, 2012
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	$ 558,875,000	$ 466,169,000
Derivative assets	13,269,000	14,746,000
Derivative liabilities	(26,562,000)	(29,814,000)
Unrealized losses on forward commitments	500,000	1,300,000
Municipal bonds and obligations
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	85,459,000	84,757,000
Government guaranteed residential mortgage-backed securities
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	43,640,000	43,092,000
Government-sponsored residential mortgage-backed securities
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	339,305,000	278,593,000
Corporate bonds
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	36,216,000	10,007,000
Trust preferred securities
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	18,377,000	20,957,000
Other bonds and obligations
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	3,382,000	3,472,000
Marketable equity securities
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	32,496,000	25,291,000
Level 1 Inputs
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	31,130,000	25,291,000
Derivative liabilities	33,000	282,000
Level 2 Inputs
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	526,077,000	439,993,000
Loans Held for sale	72,348,000	85,368,000
Derivative assets	13,269,000	14,746,000
Derivative liabilities	26,562,000	29,818,000
Level 3 Inputs
Assets and financial liabilities measured at fair value on a recurring basis
Trading account security	16,485,000	16,893,000
Available-for-sale securities:	1,668,000	885,000
Derivative assets	2,758,000	6,258,000
Derivative liabilities	517,000	1,055,000
Recurring basis
Assets and financial liabilities measured at fair value on a recurring basis
Transfers between levels	0
Recurring basis \| Level 1 Inputs
Assets and financial liabilities measured at fair value on a recurring basis
Derivative liabilities	33,000	282,000
Recurring basis \| Level 1 Inputs \| Marketable equity securities
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	31,130,000	25,291,000
Recurring basis \| Level 2 Inputs
Assets and financial liabilities measured at fair value on a recurring basis
Loans Held for sale	72,348,000	85,368,000
Derivative assets	13,269,000	14,746,000
Derivative liabilities	26,562,000	29,818,000
Recurring basis \| Level 2 Inputs \| Municipal bonds and obligations
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	85,459,000	84,757,000
Recurring basis \| Level 2 Inputs \| Government guaranteed residential mortgage-backed securities
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	43,640,000	43,091,000
Recurring basis \| Level 2 Inputs \| Government-sponsored residential mortgage-backed securities
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	339,305,000	278,593,000
Recurring basis \| Level 2 Inputs \| Corporate bonds
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	36,216,000	10,007,000
Recurring basis \| Level 2 Inputs \| Trust preferred securities
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	17,479,000	20,072,000
Recurring basis \| Level 2 Inputs \| Other bonds and obligations
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	3,382,000	3,472,000
Recurring basis \| Level 2 Inputs \| Marketable equity securities
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	596,000
Recurring basis \| Level 3 Inputs
Assets and financial liabilities measured at fair value on a recurring basis
Trading account security	16,485,000	16,893,000
Derivative assets	2,758,000	6,258,000
Derivative liabilities	517,000	1,055,000
Recurring basis \| Level 3 Inputs \| Trust preferred securities
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	898,000	885,000
Recurring basis \| Level 3 Inputs \| Marketable equity securities
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	770,000
Recurring basis \| Total Fair Value
Assets and financial liabilities measured at fair value on a recurring basis
Trading account security	16,485,000	16,893,000
Loans Held for sale	72,348,000	85,368,000
Derivative assets	16,027,000	21,004,000
Derivative liabilities	27,112,000	31,155,000
Recurring basis \| Total Fair Value \| Municipal bonds and obligations
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	85,459,000	84,757,000
Recurring basis \| Total Fair Value \| Government guaranteed residential mortgage-backed securities
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	43,640,000	43,091,000
Recurring basis \| Total Fair Value \| Government-sponsored residential mortgage-backed securities
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	339,305,000	278,593,000
Recurring basis \| Total Fair Value \| Corporate bonds
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	36,216,000	10,007,000
Recurring basis \| Total Fair Value \| Trust preferred securities
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	18,377,000	20,957,000
Recurring basis \| Total Fair Value \| Other bonds and obligations
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	3,382,000	3,472,000
Recurring basis \| Total Fair Value \| Marketable equity securities
Assets and financial liabilities measured at fair value on a recurring basis
Available-for-sale securities:	$ 32,496,000	$ 25,291,000

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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Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

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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