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SALES OF BRANCH, SUBSIDIARY AND BUSINESS UNITS - Banc Home Loans Sale Additional Information (Details) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
	Mar. 30, 2017	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
MSRs sold			$ 39,345	$ 5,382	$ 5,862
Net gain on disposal			13,796	0	0
Banc Home Loan | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash premium payment	$ 25,000
Book value of certain assets sold	2,500	$ 2,455	2,455
Income from earn-out		$ 1,100
MSRs sold	37,800		37,772
Net gain on disposal	13,800		$ 13,796	$ 0	$ 0
Buyout Option, Future Earn-Out Receivable | Banc Home Loan | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contingent consideration	35,000
Caliber
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Unpaid balances of conventional agency mortgage loans	$ 3,860,000

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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