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SALE OF BUSINESS UNIT (DISCONTINUED OPERATIONS) - Summary of net gain on disposal of discontinued operations (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2018 | Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Net cash proceeds |  |  |  | $ 0 | $ 56,076,000 |  |
Book value of MSRs sold |  | $ 0 | $ 0 | (28,549,000) | (39,186,000) |  |
Net gain on disposal |  | 0 | 211,000 | 1,275,000 | 13,749,000 |  |
Banc Home Loan | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from the transaction |  | 0 | (14,000) | 0 | 63,054,000 |  | $ 63,054,000
Compensation expense related to the transaction |  | 0 | 0 | 1,003,000 | (3,500,000) |  | (2,497,000)
Other transaction costs |  | 0 | 225,000 | 272,000 | (3,478,000) |  | (3,159,000)
Net cash proceeds |  | 0 | 211,000 | 1,275,000 | 56,076,000 |  | 57,398,000
Book value of certain assets sold | $ (2,500,000) | 0 | (2,455,000) | 0 | (2,455,000) |  |
Book value of MSRs sold | $ (37,800,000) | 0 | 0 | 0 | (37,772,000) |  | (37,772,000)
Goodwill |  | 0 | (2,100,000) | 0 | (2,100,000) |  |
Net gain on disposal |  | $ 0 | $ 211,000 | $ 1,275,000 | $ 13,749,000 | $ 15,100,000 | $ 15,071,000

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- Definition Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109222160&loc=d3e957-107759 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=109222160&loc=SL51721525-107759 + Details
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