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INVESTMENT SECURITIES - Composition, Repricing and Yield Information of Investment Securities Portfolio (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Debt Securities, Available-for-sale [Line Items]
Securities available-for-sale, one year or less, fair value	$ 1,036,034
Securities available-for-sale, one year or less, weighted average yield (percent)	4.25%
Securities available-for-sale, more than one year through five years, fair value	$ 3,317
Securities available-for-sale, more than one year through five years, weighted average yield (percent)	3.16%
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	$ 431,952
Securities available-for-sale, more than ten years, weighted average yield (percent)	3.03%
Securities available-for-sale, fair value	$ 1,471,303
Securities available-for-sale, weighted average yield (percent)	3.89%
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	$ 820
Securities available-for-sale, more than ten years, weighted average yield (percent)	3.06%
Securities available-for-sale, fair value	$ 820
Securities available-for-sale, weighted average yield (percent)	3.06%
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	$ 267
Securities available-for-sale, one year or less, weighted average yield (percent)	2.71%
Securities available-for-sale, more than one year through five years, fair value	$ 3,317
Securities available-for-sale, more than one year through five years, weighted average yield (percent)	3.16%
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	$ 430,877
Securities available-for-sale, more than ten years, weighted average yield (percent)	3.06%
Securities available-for-sale, fair value	$ 434,461
Securities available-for-sale, weighted average yield (percent)	3.03%
Non-agency residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Securities available-for-sale, one year or less, fair value	$ 76
Securities available-for-sale, one year or less, weighted average yield (percent)	3.96%
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	$ 255
Securities available-for-sale, more than ten years, weighted average yield (percent)	5.57%
Securities available-for-sale, fair value	$ 331
Securities available-for-sale, weighted average yield (percent)	5.20%
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Securities available-for-sale, one year or less, fair value	$ 1,035,691
Securities available-for-sale, one year or less, weighted average yield (percent)	4.25%
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	$ 1,035,691
Securities available-for-sale, weighted average yield (percent)	4.25%

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