SECURITIES - Schedule of Unrealized Loss and Fair Value on Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value
Less than 12 months	$ 260,146	$ 301,040
12 months or longer	242,423	0
Total	502,569	527,682
Unrealized Losses
Less than 12 months	(2,241)	(3,672)
12 months or longer	(3,975)	0
Total	(6,216)	(10,026)
Collateralized Loan Obligations [Member]
Fair Value
Less than 12 months	87,328	100,714
12 months or longer	47,245	24,511
Total	134,573	125,225
Unrealized Losses
Less than 12 months	(828)	(1,769)
12 months or longer	(691)	(403)
Total	(1,519)	(2,172)
U.S. Treasury securities and obligations of U.S. Government Sponsored Entities [Member]
Fair Value
Less than 12 months		100
12 months or longer		0
Total		100
Unrealized Losses
Less than 12 months		0
12 months or longer		0
Total		0
Mortgage-backed Securities, US Government Sponsored Enterprises [Member]
Fair Value
Less than 12 months	26,443	36,890
12 months or longer	12,366	21,640
Total	38,809	58,530
Unrealized Losses
Less than 12 months	(127)	(153)
12 months or longer	(120)	(271)
Total	(247)	(424)
Collateralized Mortgage Obligations Of US Government Sponsored Entities [Member]
Fair Value
Less than 12 months	43,963	100,148
12 months or longer	146,322	170,400
Total	190,285	270,548
Unrealized Losses
Less than 12 months	(136)	(833)
12 months or longer	(2,628)	(5,523)
Total	(2,764)	(6,356)
Private mortage backed securities [Member]
Fair Value
Less than 12 months	16,724
12 months or longer	3,287
Total	20,011
Unrealized Losses
Less than 12 months	(295)
12 months or longer	0
Total	(295)
Private collaterlized mortgage obligations [Member]
Fair Value
Less than 12 months	20,939	61,554
12 months or longer	33,203	10,091
Total	54,142	71,645
Unrealized Losses
Less than 12 months	(323)	(914)
12 months or longer	(536)	(157)
Total	(859)	(1,071)
Obligations of state and political subdivisions [Member]
Fair Value
Less than 12 months	10,716	1,734
12 months or longer	0	0
Total	10,716	1,734
Unrealized Losses
Less than 12 months	(58)	(3)
12 months or longer	0	0
Total	(58)	$ (3)
Corporate and other debt securities [member]
Fair Value
Less than 12 months	22,455
12 months or longer	0
Total	22,455
Unrealized Losses
Less than 12 months	(191)
12 months or longer	0
Total	(191)
Private commercial mortgage backed securities [Member]
Fair Value
Less than 12 months	31,578
12 months or longer	0
Total	31,578
Unrealized Losses
Less than 12 months	(283)
12 months or longer	0
Total	$ (283)