SECURITIES (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Schedule of Investments [Line Items]
Available-for-sale, Amortized Cost	$ 773,918	$ 820,728
Available-for-sale, Unrealized Gains	8,544	7,525
Available-for-sale, Unrealized Losses	(9,995)	(19,776)
Available-for-sale, Fair Value	772,467	808,477
Held-to-maturity Securities	9,798	0
Held to Maturity Securities Gross Unrealized Gain Accumulated in Investments	121
Held to Maturity Securities Gross Unrealized Loss Accumulated in Investments	(27)
Held-to-maturity Securities, Fair Value	9,892
US Government-sponsored Enterprises Debt Securities
Schedule of Investments [Line Items]
Available-for-sale, Amortized Cost	4,958
Available-for-sale, Unrealized Gains	58
Available-for-sale, Unrealized Losses	0
Available-for-sale, Fair Value	5,016
Obligations of states and political subdivisions
Schedule of Investments [Line Items]
Available-for-sale, Amortized Cost	27,242	30,143
Available-for-sale, Unrealized Gains	887	1,075
Available-for-sale, Unrealized Losses	0	(11)
Available-for-sale, Fair Value	28,129	31,207
Held-to-maturity Securities	9,798
Held to Maturity Securities Gross Unrealized Gain Accumulated in Investments	121
Held to Maturity Securities Gross Unrealized Loss Accumulated in Investments	(27)
Held-to-maturity Securities, Fair Value	9,892
Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises
Schedule of Investments [Line Items]
Available-for-sale, Amortized Cost	373,575	397,409
Available-for-sale, Unrealized Gains	6,407	5,528
Available-for-sale, Unrealized Losses	(2,809)	(7,034)
Available-for-sale, Fair Value	377,173	395,903
Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises
Schedule of Investments [Line Items]
Available-for-sale, Amortized Cost	361,617	385,847
Available-for-sale, Unrealized Gains	1,160	912
Available-for-sale, Unrealized Losses	(7,186)	(12,324)
Available-for-sale, Fair Value	355,591	374,435
Private issue collateralized mortgage obligations
Schedule of Investments [Line Items]
Available-for-sale, Amortized Cost	6,526	7,329
Available-for-sale, Unrealized Gains	32	10
Available-for-sale, Unrealized Losses	0	(407)
Available-for-sale, Fair Value	$ 6,558	$ 6,932