SECURITIES - Schedule of Unrealized Loss and Fair Value on Investments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value
Less than 12 months	$ 364,135	$ 430,644
12 months or longer	131,389	80,700
Total	495,524	511,344
Unrealized Losses
Less than 12 months	(9,740)	(15,561)
12 months or longer	(6,493)	(4,442)
Total	(16,233)	(20,003)
Mortgage-Backed Securities of U.S. Government Sponsored Entities [Member]
Fair Value
Less than 12 months	71,947	33,425
12 months or longer	28,370	35,043
Total	100,317	68,468
Unrealized Losses
Less than 12 months	(1,871)	(2,045)
12 months or longer	(1,665)	(2,144)
Total	(3,536)	(4,189)
Collateralized Mortgage Obligations of U.S. Government Sponsored Entities [Member]
Fair Value
Less than 12 months	201,523	287,312
12 months or longer	102,894	45,657
Total	304,417	332,969
Unrealized Losses
Less than 12 months	(6,782)	(12,450)
12 months or longer	(4,827)	(2,297)
Total	(11,609)	(14,747)
Private Mortgage-Backed Securities [Member]
Fair Value
Less than 12 months	29,495	29,573
12 months or longer	0	0
Total	29,495	29,573
Unrealized Losses
Less than 12 months	(343)	(226)
12 months or longer	0	0
Total	(343)	(226)
Private Collateralized Mortgage Obligations [Member]
Fair Value
Less than 12 months	28,443	47,653
12 months or longer	0	0
Total	28,443	47,653
Unrealized Losses
Less than 12 months	(331)	(413)
12 months or longer	0	0
Total	(331)	(413)
Collateralized Loan Obligations [Member]
Fair Value
Less than 12 months	32,215	32,179
12 months or longer	0	0
Total	32,215	32,179
Unrealized Losses
Less than 12 months	(409)	(413)
12 months or longer	0	0
Total	(409)	(413)
Obligations of State and Political Subdivisions [Member]
Fair Value
Less than 12 months	512	502
12 months or longer	125	0
Total	637	502
Unrealized Losses
Less than 12 months	(4)	(14)
12 months or longer	(1)	(1)
Total	$ (5)	$ (15)