SECURITIES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013 item	Mar. 31, 2012 security item	Dec. 31, 2012
Available for sale securities
Amortized Cost	$ 872,982		$ 862,759
Gross Unrealized Gains	34,292		39,837
Gross Unrealized Losses	(878)		(255)
Fair Value	906,396		902,341
Available for Sale, Amortized Cost
Within one year	7,262
One through five years	54,150
Six through ten years	104,927
After ten years	152,863
Equity securities	4,939
Total available for sale securities	872,982		862,759
Available for Sale, Fair Value
Within one year	7,414
One through five years	56,878
Six through ten years	112,216
After ten years	166,830
Equity securities	4,939
Fair Value	906,396		902,341
Available for sale securities
Proceeds from sales of securities	77,390	19,956
Gross gains realized on sales	899	1,022
Gross losses realized on sales	55	35
Number of investments on which impairment loss was recognized		1
Impairment loss recognized		500
Cost basis of one of the equity holdings		250
Securities in a continuous unrealized loss position with unrealized losses presented by length of time
Less than 12 months, Fair Value	145,386		52,732
Less than 12 months, Unrealized Losses	(878)		(255)
Total Fair Value	145,386		52,732
Total Unrealized Losses	(878)		(255)
Other-Than-Temporary-Impairment
Number of general segments segregated in investment securities portfolio	2
Number of securities in the portfolio	1,007
Number of portfolio securities in unrealized loss position	80
Decline in fair value of security attributable to change in interest rates and illiquidity	173
Number of equity holdings determined to be other than temporarily impaired and partially written down		1
U. S. government agency
Available for sale securities
Amortized Cost	1,360		1,600
Gross Unrealized Gains	30		38
Fair Value	1,390		1,638
Available for Sale, Amortized Cost
Total available for sale securities	1,360		1,600
Available for Sale, Fair Value
Fair Value	1,390		1,638
State and municipal
Available for sale securities
Amortized Cost	314,292		310,552
Gross Unrealized Gains	24,388		27,484
Gross Unrealized Losses	(271)		(97)
Fair Value	338,409		337,939
Available for Sale, Amortized Cost
Total available for sale securities	314,292		310,552
Available for Sale, Fair Value
Fair Value	338,409		337,939
Securities in a continuous unrealized loss position with unrealized losses presented by length of time
Less than 12 months, Fair Value	18,870		6,646
Less than 12 months, Unrealized Losses	(271)		(97)
Total Fair Value	18,870		6,646
Total Unrealized Losses	(271)		(97)
Mortgage-backed securities-residential (Government Sponsored Entity)
Available for sale securities
Amortized Cost	211,112		219,352
Gross Unrealized Gains	6,221		7,711
Gross Unrealized Losses	(173)		(8)
Fair Value	217,160		227,055
Available for Sale, Amortized Cost
Debt securities without single maturity date	211,112
Total available for sale securities	211,112		219,352
Available for Sale, Fair Value
Debt securities without single maturity date	217,160
Fair Value	217,160		227,055
Securities in a continuous unrealized loss position with unrealized losses presented by length of time
Less than 12 months, Fair Value	16,847		12,766
Less than 12 months, Unrealized Losses	(173)		(8)
Total Fair Value	16,847		12,766
Total Unrealized Losses	(173)		(8)
Collateralized mortgage obligations (Government Sponsored Entity)
Available for sale securities
Amortized Cost	337,729		322,758
Gross Unrealized Gains	3,653		4,604
Gross Unrealized Losses	(423)		(139)
Fair Value	340,959		327,223
Available for Sale, Amortized Cost
Debt securities without single maturity date	337,729
Total available for sale securities	337,729		322,758
Available for Sale, Fair Value
Debt securities without single maturity date	340,959
Fair Value	340,959		327,223
Securities in a continuous unrealized loss position with unrealized losses presented by length of time
Less than 12 months, Fair Value	108,679		32,330
Less than 12 months, Unrealized Losses	(423)		(139)
Total Fair Value	108,679		32,330
Total Unrealized Losses	(423)		(139)
Other-Than-Temporary-Impairment
Other than temporary impairment	0
Equity securities
Available for sale securities
Amortized Cost	4,939		4,939
Fair Value	4,939		4,939
Available for Sale, Amortized Cost
Total available for sale securities	4,939		4,939
Available for Sale, Fair Value
Fair Value	4,939		4,939
Other securities
Available for sale securities
Amortized Cost	3,550		3,558
Gross Unrealized Losses	(11)		(11)
Fair Value	3,539		3,547
Available for Sale, Amortized Cost
Total available for sale securities	3,550		3,558
Available for Sale, Fair Value
Fair Value	3,539		3,547
Securities in a continuous unrealized loss position with unrealized losses presented by length of time
Less than 12 months, Fair Value	990		990
Less than 12 months, Unrealized Losses	(11)		(11)
Total Fair Value	990		990
Total Unrealized Losses	$ (11)		$ (11)
Other-Than-Temporary-Impairment
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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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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

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This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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+ References

No definition available.

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Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the available-for-sale investments determined to be temporarily impaired.

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The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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