SECURITIES - Schedule of Unrealized Loss and Fair Value on Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value
Less than 12 months	$ 211,968	$ 443,830
12 months or longer	256,947	254,229
Total	468,915	698,059
Unrealized Losses
Less than 12 months	(6,411)	(6,030)
12 months or longer	(5,860)	(6,673)
Total	(12,271)	(12,703)
Collateralized Loan Obligations [Member]
Fair Value
Less than 12 months	98,879	101,601
12 months or longer	59,826	60,922
Total	158,705	162,523
Unrealized Losses
Less than 12 months	(4,479)	(1,642)
12 months or longer	(2,767)	(1,612)
Total	(7,246)	(3,254)
Mortgage-backed Securities, US Government Sponsored Enterprises [Member]
Fair Value
Less than 12 months	30,876	112,236
12 months or longer	6,201	14,508
Total	37,077	126,744
Unrealized Losses
Less than 12 months	(231)	(1,082)
12 months or longer	(118)	(256)
Total	(349)	(1,338)
Collateralized Mortgage Obligations Of US Government Sponsored Entities [Member]
Fair Value
Less than 12 months	4,005	97,512
12 months or longer	126,260	147,266
Total	130,265	244,778
Unrealized Losses
Less than 12 months	(46)	(973)
12 months or longer	(1,485)	(4,333)
Total	(1,531)	(5,306)
Private mortage backed securities [Member]
Fair Value
Less than 12 months	17,252	31,792
12 months or longer	14,359	0
Total	31,611	31,792
Unrealized Losses
Less than 12 months	(668)	(766)
12 months or longer	(330)	0
Total	(998)	(766)
Private collateralized mortgage obligations [Member]
Fair Value
Less than 12 months	11,883	19,939
12 months or longer	50,301	31,533
Total	62,184	51,472
Unrealized Losses
Less than 12 months	(232)	(321)
12 months or longer	(1,160)	(472)
Total	(1,392)	(793)
Obligations of state and political subdivisions [Member]
Fair Value
Less than 12 months	3,012	11,570
12 months or longer	0	0
Total	3,012	11,570
Unrealized Losses
Less than 12 months	(18)	(110)
12 months or longer	0	0
Total	(18)	(110)
Corporate and other debt securities [member]
Fair Value
Less than 12 months	16,713	31,342
12 months or longer	0	0
Total	16,713	31,342
Unrealized Losses
Less than 12 months	(204)	(416)
12 months or longer	0	0
Total	(204)	(416)
Private commercial mortgage backed securities [Member]
Fair Value
Less than 12 months	29,348	37,838
12 months or longer	0	0
Total	29,348	37,838
Unrealized Losses
Less than 12 months	(533)	(720)
12 months or longer	0	0
Total	$ (533)	$ (720)