SECURITIES - Schedule of Unrealized Loss and Fair Value on Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fair Value
Less than 12 months	$ 310,854	$ 301,040
12 months or longer	199,834	226,642
Total	510,688	527,682
Unrealized Losses
Less than 12 months	(3,182)	(3,672)
12 months or longer	(4,813)	(6,354)
Total	(7,995)	(10,026)
Collateralized Loan Obligations [Member]
Fair Value
Less than 12 months	37,325	100,714
12 months or longer	24,635	24,511
Total	61,960	125,225
Unrealized Losses
Less than 12 months	(291)	(1,769)
12 months or longer	(283)	(403)
Total	(574)	(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	71,485	36,890
12 months or longer	9,516	21,640
Total	81,001	58,530
Unrealized Losses
Less than 12 months	(581)	(153)
12 months or longer	(201)	(271)
Total	(782)	(424)
Collateralized Mortgage Obligations Of US Government Sponsored Entities [Member]
Fair Value
Less than 12 months	91,107	100,148
12 months or longer	150,895	170,400
Total	242,002	270,548
Unrealized Losses
Less than 12 months	(732)	(833)
12 months or longer	(4,072)	(5,523)
Total	(4,804)	(6,356)
Private mortage backed securities [Member]
Fair Value
Less than 12 months	16,677
12 months or longer	0
Total	16,677
Unrealized Losses
Less than 12 months	(304)
12 months or longer	0
Total	(304)
Private collaterlized mortgage obligations [Member]
Fair Value
Less than 12 months	46,084	61,554
12 months or longer	14,788	10,091
Total	60,872	71,645
Unrealized Losses
Less than 12 months	(730)	(914)
12 months or longer	(257)	(157)
Total	(987)	(1,071)
Obligations of state and political subdivisions [Member]
Fair Value
Less than 12 months	13,256	1,734
12 months or longer	0	0
Total	13,256	1,734
Unrealized Losses
Less than 12 months	(276)	(3)
12 months or longer	0	0
Total	(276)	$ (3)
Corporate and other debt securities [member]
Fair Value
Less than 12 months	21,276
12 months or longer	0
Total	21,276
Unrealized Losses
Less than 12 months	(211)
12 months or longer	0
Total	(211)
Private commercial mortgage backed securities [Member]
Fair Value
Less than 12 months	13,644
12 months or longer	0
Total	13,644
Unrealized Losses
Less than 12 months	(57)
12 months or longer	0
Total	$ (57)