SECURITIES - Schedule of Unrealized Loss and Fair Value on Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fair Value
Less than 12 months	$ 94,210	$ 443,830
12 months or longer	271,018	254,229
Total	365,228	698,059
Unrealized Losses
Less than 12 months	(2,292)	(6,030)
12 months or longer	(6,086)	(6,673)
Total	(8,378)	(12,703)
Collateralized Loan Obligations [Member]
Fair Value
Less than 12 months	41,111	101,601
12 months or longer	102,048	60,922
Total	143,159	162,523
Unrealized Losses
Less than 12 months	(1,444)	(1,642)
12 months or longer	(3,573)	(1,612)
Total	(5,017)	(3,254)
Mortgage-backed securities of U.S. Government Sponsored Entities [Member]
Fair Value
Less than 12 months	8,029	112,236
12 months or longer	6,046	14,508
Total	14,075	126,744
Unrealized Losses
Less than 12 months	(6)	(1,082)
12 months or longer	(93)	(256)
Total	(99)	(1,338)
Collateralized Mortgage Obligations Of US Government Sponsored Entities [Member]
Fair Value
Less than 12 months	0	97,512
12 months or longer	77,297	147,266
Total	77,297	244,778
Unrealized Losses
Less than 12 months	0	(973)
12 months or longer	(744)	(4,333)
Total	(744)	(5,306)
Private mortgage backed securities [Member]
Fair Value
Less than 12 months	27,424	31,792
12 months or longer	16,824	0
Total	44,248	31,792
Unrealized Losses
Less than 12 months	(539)	(766)
12 months or longer	(329)	0
Total	(868)	(766)
Private collateralized mortgage obligations [Member]
Fair Value
Less than 12 months	3,984	19,939
12 months or longer	49,650	31,533
Total	53,634	51,472
Unrealized Losses
Less than 12 months	(166)	(321)
12 months or longer	(1,035)	(472)
Total	(1,201)	(793)
Obligations of state and political subdivisions [Member]
Fair Value
Less than 12 months		11,570
12 months or longer		0
Total		11,570
Unrealized Losses
Less than 12 months		(110)
12 months or longer		0
Total		(110)
Corporate and other debt securities [member]
Fair Value
Less than 12 months	9,118	31,342
12 months or longer	2,150	0
Total	11,268	31,342
Unrealized Losses
Less than 12 months	(87)	(416)
12 months or longer	(7)	0
Total	(94)	(416)
Private commercial mortgage backed securities [Member]
Fair Value
Less than 12 months	4,544	37,838
12 months or longer	17,003	0
Total	21,547	37,838
Unrealized Losses
Less than 12 months	(50)	(720)
12 months or longer	(305)	0
Total	$ (355)	$ (720)