FAIR VALUE MEASUREMENT (Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financial Assets:
Loans held for sale	$ 2,826
Fair Value, Measurements, Recurring
Financial Assets:
Trading account assets	2,281	2,300
Customer interest rate swap agreements	193	496
Financial Liabilities:
Interest rate swap agreements	6,437	11,580
Fair Value, Measurements, Recurring \| Obligations of states and political subdivisions
Financial Assets:
Securities available-for-sale	30,489	33,040
Fair Value, Measurements, Recurring \| Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises
Financial Assets:
Securities available-for-sale	348,778	358,148
Fair Value, Measurements, Recurring \| Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises
Financial Assets:
Securities available-for-sale	402,257	381,688
Fair Value, Measurements, Recurring \| Private issue collateralized mortgage obligations
Financial Assets:
Securities available-for-sale	7,845	8,174
Readily Available Market Prices (Level 1) \| Fair Value, Measurements, Recurring
Financial Assets:
Trading account assets	2,281	2,300
Observable Market Data (Level 2)
Financial Assets:
Securities available-for-sale	789,369	781,050
Loans held for sale	2,826
Customer interest rate swap agreements	193	496
Financial Liabilities:
Interest rate swap agreements	6,437	11,580
Observable Market Data (Level 2) \| Fair Value, Measurements, Recurring
Financial Assets:
Customer interest rate swap agreements	193	496
Financial Liabilities:
Interest rate swap agreements	6,437	11,580
Observable Market Data (Level 2) \| Fair Value, Measurements, Recurring \| Obligations of states and political subdivisions
Financial Assets:
Securities available-for-sale	30,489	33,040
Observable Market Data (Level 2) \| Fair Value, Measurements, Recurring \| Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises
Financial Assets:
Securities available-for-sale	348,778	358,148
Observable Market Data (Level 2) \| Fair Value, Measurements, Recurring \| Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises
Financial Assets:
Securities available-for-sale	402,257	381,688
Observable Market Data (Level 2) \| Fair Value, Measurements, Recurring \| Private issue collateralized mortgage obligations
Financial Assets:
Securities available-for-sale	$ 7,845	$ 8,174

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 values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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- Definition

Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date.

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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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