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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value
Less Than 12 Months	$ 1,377,901	$ 109,214
12 Months or Longer	457,632	470,240
Total	1,835,533	579,454
Gross Unrealized Losses
Less Than 12 Months	(9,613)	(301)
12 Months or Longer	(24,723)	(15,302)
Total	(34,336)	(15,603)
SBA loan pool securities
Fair Value
Less Than 12 Months	0
12 Months or Longer	910
Total	910
Gross Unrealized Losses
Less Than 12 Months	0
12 Months or Longer	(1)
Total	(1)
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities
Fair Value
Less Than 12 Months	13,494	4,880
12 Months or Longer	423,916	470,092
Total	437,410	474,972
Gross Unrealized Losses
Less Than 12 Months	(133)	(35)
12 Months or Longer	(24,412)	(15,301)
Total	(24,545)	(15,336)
Non-agency residential mortgage-backed securities
Fair Value
Less Than 12 Months	90	0
12 Months or Longer	16	148
Total	106	148
Gross Unrealized Losses
Less Than 12 Months	0	0
12 Months or Longer	0	(1)
Total	0	(1)
Collateralized loan obligations
Fair Value
Less Than 12 Months	1,364,317	104,334
12 Months or Longer	32,790	0
Total	1,397,107	104,334
Gross Unrealized Losses
Less Than 12 Months	(9,480)	(266)
12 Months or Longer	(310)	0
Total	$ (9,790)	$ (266)

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