SECURITIES - Schedule of Unrealized Loss and Fair Value on Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair Value
Less than 12 months	$ 135,412	$ 443,830
12 months or longer	204,738	254,229
Total	340,150	698,059
Unrealized Losses
Less than 12 months	(1,259)	(6,030)
12 months or longer	(3,356)	(6,673)
Total	(4,615)	(12,703)
Collateralized Loan Obligations [Member]
Fair Value
Less than 12 months	0	101,601
12 months or longer	51,460	60,922
Total	51,460	162,523
Unrealized Losses
Less than 12 months	0	(1,642)
12 months or longer	(1,141)	(1,612)
Total	(1,141)	(3,254)
Mortgage-backed securities of U.S. Government Sponsored Entities [Member]
Fair Value
Less than 12 months	5,241	112,236
12 months or longer	5,735	14,508
Total	10,976	126,744
Unrealized Losses
Less than 12 months	(9)	(1,082)
12 months or longer	(87)	(256)
Total	(96)	(1,338)
Collateralized Mortgage Obligations Of US Government Sponsored Entities [Member]
Fair Value
Less than 12 months	96,741	97,512
12 months or longer	72,794	147,266
Total	169,535	244,778
Unrealized Losses
Less than 12 months	(492)	(973)
12 months or longer	(892)	(4,333)
Total	(1,384)	(5,306)
Private mortgage backed securities [Member]
Fair Value
Less than 12 months	15,007	31,792
12 months or longer	17,025	0
Total	32,032	31,792
Unrealized Losses
Less than 12 months	(520)	(766)
12 months or longer	(168)	0
Total	(688)	(766)
Private collateralized mortgage obligations [Member]
Fair Value
Less than 12 months	3,588	19,939
12 months or longer	43,918	31,533
Total	47,506	51,472
Unrealized Losses
Less than 12 months	(141)	(321)
12 months or longer	(831)	(472)
Total	(972)	(793)
Obligations of state and political subdivisions [Member]
Fair Value
Less than 12 months	3,692	11,570
12 months or longer	0	0
Total	3,692	11,570
Unrealized Losses
Less than 12 months	(52)	(110)
12 months or longer	0	0
Total	(52)	(110)
Corporate and other debt securities [member]
Fair Value
Less than 12 months	8,192	31,342
12 months or longer	1,996	0
Total	10,188	31,342
Unrealized Losses
Less than 12 months	(35)	(416)
12 months or longer	(4)	0
Total	(39)	(416)
Commercial mortgage backed securities [Member]
Fair Value
Less than 12 months	2,951	37,838
12 months or longer	11,810	0
Total	14,761	37,838
Unrealized Losses
Less than 12 months	(10)	(720)
12 months or longer	(233)	0
Total	$ (243)	$ (720)