SECURITIES (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months	$ 146,417	$ 386,967
Unrealized Losses - Less Than 12 Months	(917)	(11,942)
Fair Value - 12 Months of More	322,592	122,236
Unrealized Losses - 12 Months or More	(10,810)	(7,834)
Fair Value	469,009	509,203
Unrealized losses	(11,727)	(19,776)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3,401
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(41)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	3,401
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(41)
US Government-sponsored Enterprises Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months	61,223	145,424
Unrealized Losses - Less Than 12 Months	(460)	(4,189)
Fair Value - 12 Months of More	127,219	43,915
Unrealized Losses - 12 Months or More	(3,819)	(2,845)
Fair Value	188,442	189,339
Unrealized losses	(4,279)	(7,034)
Collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months	80,475	239,278
Unrealized Losses - Less Than 12 Months	(393)	(7,738)
Fair Value - 12 Months of More	195,373	73,376
Unrealized Losses - 12 Months or More	(6,991)	(4,586)
Fair Value	275,848	312,654
Unrealized losses	(7,384)	(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	3,401
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(41)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	3,401
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(41)
Private issue collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Fair Value - Less Than 12 Months	4,719	122
Unrealized Losses - Less Than 12 Months	(64)	(4)
Fair Value - 12 Months of More	0	4,945
Unrealized Losses - 12 Months or More	0	(403)
Fair Value	4,719	5,067
Unrealized losses	$ (64)	$ (407)