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INVESTMENT SECURITIES - Composition, Repricing and Yield Information of Investment Securities (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Debt Securities, Available-for-sale [Line Items]
One year or less	$ 799,708
One year or less (percent)	3.47%
More than One Year through Five Years	$ 13,579
More than One Year through Five Years (percent)	4.11%
More than Five Years through Ten Years	$ 9,952
More than Five Years through Ten Years (percent)	2.47%
More than Ten Years	$ 89,341
More than Ten Years (percent)	2.70%
Total	$ 912,580
Total (percent)	3.40%
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	$ 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	$ 36,456
More than Ten Years (percent)	2.56%
Total	$ 36,456
Total (percent)	2.56%
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
One year or less	$ 81,347
One year or less (percent)	2.28%
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	$ 9,952
More than Five Years through Ten Years (percent)	2.47%
More than Ten Years	$ 0
More than Ten Years (percent)	0.00%
Total	$ 91,299
Total (percent)	2.30%
Municipal 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	$ 52,689
More than Ten Years (percent)	2.79%
Total	$ 52,689
Total (percent)	2.79%
Non-agency residential 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	$ 0
More than Five Years through Ten Years (percent)	0.00%
More than Ten Years	$ 196
More than Ten Years (percent)	6.28%
Total	$ 196
Total (percent)	6.28%
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
One year or less	$ 718,361
One year or less (percent)	3.61%
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	$ 718,361
Total (percent)	3.61%
Corporate debt 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	$ 13,579
More than One Year through Five Years (percent)	4.11%
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	$ 13,579
Total (percent)	4.11%

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