SECURITIES (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months	$ 19,027	$ 386,967
Unrealized Losses - Less Than 12 Months	(60)	(11,942)
Fair Value - 12 Months of More	378,533	122,236
Unrealized Losses - 12 Months or More	(9,935)	(7,834)
Fair Value	397,560	509,203
Unrealized losses	(9,995)	(19,776)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3,664
Held to Maturity Securities Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated in Investments	(27)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Held to Maturity Securities Continues Unrealized Loss Position of 12 Months or Longer Aggregate Losses Accumulated in Investments	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	3,664
Held to Maturity Securities Gross Unrealized Loss Accumulated in Investments	(27)
US Government-sponsored Enterprises Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months	14,043	145,424
Unrealized Losses - Less Than 12 Months	(11)	(4,189)
Fair Value - 12 Months of More	132,457	43,915
Unrealized Losses - 12 Months or More	(2,798)	(2,845)
Fair Value	146,500	189,339
Unrealized losses	(2,809)	(7,034)
Collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months	4,984	239,278
Unrealized Losses - Less Than 12 Months	(49)	(7,738)
Fair Value - 12 Months of More	246,076	73,376
Unrealized Losses - 12 Months or More	(7,137)	(4,586)
Fair Value	251,060	312,654
Unrealized losses	(7,186)	(12,324)
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months		2,143
Unrealized Losses - Less Than 12 Months		(11)
Fair Value - 12 Months of More		0
Unrealized Losses - 12 Months or More		0
Fair Value		2,143
Unrealized losses		(11)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3,664
Held to Maturity Securities Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated in Investments	(27)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Held to Maturity Securities Continues Unrealized Loss Position of 12 Months or Longer Aggregate Losses Accumulated in Investments	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	3,664
Held to Maturity Securities Gross Unrealized Loss Accumulated in Investments	(27)
Private issue collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months		122
Unrealized Losses - Less Than 12 Months		(4)
Fair Value - 12 Months of More		4,945
Unrealized Losses - 12 Months or More		(403)
Fair Value		5,067
Unrealized losses		$ (407)