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INVESTMENT SECURITIES - Composition, Repricing and Yield Information of Investment Securities Portfolio (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Debt Securities, Available-for-sale [Line Items]
Securities available-for-sale, one year or less, fair value	$ 737,511
Securities available-for-sale, one year or less, weighted average yield (percent)	3.71%
Securities available-for-sale, more than one year through five years, fair value	$ 3,069
Securities available-for-sale, more than one year through five years, weighted average yield (percent)	2.67%
Securities available-for-sale, more than five years through ten years, fair value	$ 0
Securities available-for-sale, more than five years through ten years, weighted average yield (percent)	0.00%
Securities available-for-sale, more than ten years, fair value	$ 427,107
Securities available-for-sale, more than ten years, weighted average yield (percent)	2.74%
Securities available-for-sale, fair value	$ 1,167,687
Securities available-for-sale, weighted average yield (percent)	3.35%
SBA loan pools securities
Debt Securities, Available-for-sale [Line Items]
Securities available-for-sale, one year or less, fair value	$ 0
Securities available-for-sale, one year or less, weighted average yield (percent)	0.00%
Securities available-for-sale, more than one year through five years, fair value	$ 0
Securities available-for-sale, more than one year through five years, weighted average yield (percent)	0.00%
Securities available-for-sale, more than five years through ten years, fair value	$ 0
Securities available-for-sale, more than five years through ten years, weighted average yield (percent)	0.00%
Securities available-for-sale, more than ten years, fair value	$ 853
Securities available-for-sale, more than ten years, weighted average yield (percent)	2.08%
Securities available-for-sale, fair value	$ 853
Securities available-for-sale, weighted average yield (percent)	2.08%
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Securities available-for-sale, one year or less, fair value	$ 243
Securities available-for-sale, one year or less, weighted average yield (percent)	2.36%
Securities available-for-sale, more than one year through five years, fair value	$ 3,069
Securities available-for-sale, more than one year through five years, weighted average yield (percent)	2.67%
Securities available-for-sale, more than five years through ten years, fair value	$ 0
Securities available-for-sale, more than five years through ten years, weighted average yield (percent)	0.00%
Securities available-for-sale, more than ten years, fair value	$ 426,035
Securities available-for-sale, more than ten years, weighted average yield (percent)	2.74%
Securities available-for-sale, fair value	$ 429,347
Securities available-for-sale, weighted average yield (percent)	2.74%
Non-agency residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Securities available-for-sale, one year or less, fair value	$ 66
Securities available-for-sale, one year or less, weighted average yield (percent)	3.23%
Securities available-for-sale, more than one year through five years, fair value	$ 0
Securities available-for-sale, more than one year through five years, weighted average yield (percent)	0.00%
Securities available-for-sale, more than five years through ten years, fair value	$ 0
Securities available-for-sale, more than five years through ten years, weighted average yield (percent)	0.00%
Securities available-for-sale, more than ten years, fair value	$ 219
Securities available-for-sale, more than ten years, weighted average yield (percent)	5.74%
Securities available-for-sale, fair value	$ 285
Securities available-for-sale, weighted average yield (percent)	5.16%
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Securities available-for-sale, one year or less, fair value	$ 737,202
Securities available-for-sale, one year or less, weighted average yield (percent)	3.71%
Securities available-for-sale, more than one year through five years, fair value	$ 0
Securities available-for-sale, more than one year through five years, weighted average yield (percent)	0.00%
Securities available-for-sale, more than five years through ten years, fair value	$ 0
Securities available-for-sale, more than five years through ten years, weighted average yield (percent)	0.00%
Securities available-for-sale, more than ten years, fair value	$ 0
Securities available-for-sale, more than ten years, weighted average yield (percent)	0.00%
Securities available-for-sale, fair value	$ 737,202
Securities available-for-sale, weighted average yield (percent)	3.71%

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