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SALE OF BUSINESS UNIT (DISCONTINUED OPERATIONS) - Banc Home Loans Sale Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended	15 Months Ended
	Mar. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018	Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
MSRs sold		$ 2,570	$ 0	$ 28,549	$ 39,186
Net gain on disposal		272	236	1,275	13,538
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
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	0	2,455	0	2,455		$ 0
Income from earn-out		777		1,400			2,500
MSRs sold	$ 37,800	0	0	0	37,772		37,772
Net gain on disposal		$ 272	$ 236	1,275	$ 13,538	$ 15,100	$ 15,071
Reversal of accrued liabilities				$ 1,000
Banc Home Loan | Discontinued Operations, Disposed of by Sale | Buyout Option, Future Earn-Out Receivable
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Earn-out performance period	38 months
Contingent consideration	$ 35,000

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