SECURITIES (Narrative) (Detail) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Schedule of Investments [Line Items]
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds	$ 18,324,000	$ 4,875,000	$ 31,364,000
Unrealized gains on securities available-for-sale included in accumulated other comprehensive income, net of deferred taxes		(2,590,000)		12,943,000
Unrealized gains on securities available-for-sale included in accumulated other comprehensive income, deferred taxes		(1,400,000)		7,000,000
Investment securities with unrealized losses that are considered temporary		476,398,000		124,054,000
Unrealized losses		13,514,000		896,000
Carrying amount of investment securities sold		4,900,000
Security pledged as collateral, amortized cost		440,100,000		465,000,000
Security pledged as collateral, fair value		443,100,000		482,400,000
Available-for-sale Securities, Gross Realized Gains	951,000	138,000	1,104,000
Available-for-sale Securities, Gross Realized Losses	(200,000)		(203,000)
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities			(29,000)
Fair Value - 12 Months of More		5,985,000		8,174,000
Collateralized mortgage obligations
Schedule of Investments [Line Items]
Investment securities with unrealized losses that are considered temporary		298,708,000		73,098,000
Unrealized losses		7,840,000		120,000
Private issue collateralized mortgage obligations
Schedule of Investments [Line Items]
Investment securities with unrealized losses that are considered temporary		6,124,000		8,174,000
Unrealized losses		273,000		697,000
Fair Value - 12 Months of More		$ 5,985,000		$ 8,174,000