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INVESTMENT SECURITIES - Composition, Repricing and Yield Information of Investment Securities (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items]
One year or less	$ 1,421,884
One year or less (percent)	4.44%
More than One Year through Five Years	$ 3,460
More than One Year through Five Years (percent)	3.32%
More than Five Years through Ten Years	$ 132,199
More than Five Years through Ten Years (percent)	3.75%
More than Ten Years	$ 434,957
More than Ten Years (percent)	3.23%
Total	$ 1,992,500
Total (percent)	4.13%
SBA loan pool securities
Debt Securities, Available-for-sale [Line Items]
One year or less	$ 0
One year or less (percent)	0.00%
More than One Year through Five Years	$ 0
More than One Year through Five Years (percent)	0.00%
More than Five Years through Ten Years	$ 0
More than Five Years through Ten Years (percent)	0.00%
More than Ten Years	$ 910
More than Ten Years (percent)	2.84%
Total	$ 910
Total (percent)	2.84%
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
One year or less	$ 279
One year or less (percent)	2.95%
More than One Year through Five Years	$ 3,460
More than One Year through Five Years (percent)	3.32%
More than Five Years through Ten Years	$ 0
More than Five Years through Ten Years (percent)	0.00%
More than Ten Years	$ 433,703
More than Ten Years (percent)	3.23%
Total	$ 437,442
Total (percent)	3.23%
Non-agency residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
One year or less	$ 83
One year or less (percent)	3.96%
More than One Year through Five Years	$ 0
More than One Year through Five Years (percent)	0.00%
More than Five Years through Ten Years	$ 0
More than Five Years through Ten Years (percent)	0.00%
More than Ten Years	$ 344
More than Ten Years (percent)	5.47%
Total	$ 427
Total (percent)	5.18%
Non-agency commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
One year or less	$ 0
One year or less (percent)	0.00%
More than One Year through Five Years	$ 0
More than One Year through Five Years (percent)	0.00%
More than Five Years through Ten Years	$ 132,199
More than Five Years through Ten Years (percent)	3.75%
More than Ten Years	$ 0
More than Ten Years (percent)	0.00%
Total	$ 132,199
Total (percent)	3.75%
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
One year or less	$ 1,421,522
One year or less (percent)	4.44%
More than One Year through Five Years	$ 0
More than One Year through Five Years (percent)	0.00%
More than Five Years through Ten Years	$ 0
More than Five Years through Ten Years (percent)	0.00%
More than Ten Years	$ 0
More than Ten Years (percent)	0.00%
Total	$ 1,421,522
Total (percent)	4.44%

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