SECURITIES - Schedule of Unrealized Loss and Fair Value on Investments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Fair Value
Less than 12 months	$ 335,813	$ 430,644
12 months or longer	219,047	80,700
Total	554,860	511,344
Unrealized Losses
Less than 12 months	(3,150)	(15,561)
12 months or longer	(7,884)	(4,442)
Total	(11,034)	(20,003)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value
Less than 12 months	45,308	33,425
12 months or longer	28,272	35,043
Total	73,580	68,468
Unrealized Losses
Less than 12 months	(176)	(2,045)
12 months or longer	(640)	(2,144)
Total	(816)	(4,189)
Collateralized Mortgage Obligations Of Us Government Sponsored Entities [Member]
Fair Value
Less than 12 months	186,842	287,312
12 months or longer	160,278	45,657
Total	347,120	332,969
Unrealized Losses
Less than 12 months	(2,085)	(12,450)
12 months or longer	(6,937)	(2,297)
Total	(9,022)	(14,747)
Private mortage backed securities [Member]
Fair Value
Less than 12 months		29,573
12 months or longer		0
Total		29,573
Unrealized Losses
Less than 12 months		(226)
12 months or longer		0
Total		(226)
Private collaterlized mortgage obligations [Member]
Fair Value
Less than 12 months	6,763	47,653
12 months or longer	10,758	0
Total	17,521	47,653
Unrealized Losses
Less than 12 months	(108)	(413)
12 months or longer	(136)	0
Total	(244)	(413)
Collateralized Loan Obligations [Member]
Fair Value
Less than 12 months	96,900	32,179
12 months or longer	19,739	0
Total	116,639	32,179
Unrealized Losses
Less than 12 months	(781)	(413)
12 months or longer	(171)	0
Total	(952)	(413)
Obligations of state and political subdivisions [Member]
Fair Value
Less than 12 months		502
12 months or longer		0
Total		502
Unrealized Losses
Less than 12 months		(14)
12 months or longer		(1)
Total		$ (15)