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LOAN SERVICING - Activity in MSR (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Servicing Assets at Fair Value [Line Items] |  |  |  |  |
Mortgage banking operations | $ 8.0 | $ 5.0 | $ 12.0 | $ 11.0 |
Mortgage Servicing Rights [Member] |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |
Mortgage loans sold with servicing retained | 4,333.0 |  | 4,333.0 |  | $ 3,968.0
Mortgage loans sold with servicing retained | 406.0 | 283.0 | 583.0 | 520.0 |
Pretax gains resulting from above loan sales | 9.0 | 5.0 | 13.0 | 9.0 |
Mortgage banking operations | 3.0 | 2.0 | 5.0 | 4.0 |
Valuation allowance for servicing rights | 3.1 |  | 3.1 |  |
Valuation allowance for servicing rights, increase |  |  | 2.6 |  |
Servicing Asset at Amortized Cost, Balance [Roll Forward] |  |  |  |  |
Balance at beginning of period | 36.4 | 30.8 | 36.8 | 29.1 |
Additions | 4.3 | 3.3 | 6.3 | 6.0 |
Payoffs and curtailments | (0.8) | (0.5) | (1.3) | (0.9) |
Impairment charge | (1.3) | 0.0 | (2.6) | 0.0 |
Amortization | (0.6) | (0.6) | (1.2) | (1.2) |
Balance at end of period | 38.0 | 33.0 | 38.0 | 33.0 |
Loan servicing rights, fair value, start | 40.3 | 36.4 | 41.1 | 32.4 |
Loan servicing rights, fair value, end | $ 39.8 | $ 38.6 | $ 39.8 | $ 38.6 |

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- Definition Income from mortgage banking activities (fees and commissions) and servicing real estate mortgages, credit cards, and other financial assets held by others net of any related impairment of capitalized service costs. Also includes any premiums received in lieu of regular servicing fees on such loans only as earned over the life of the loans. + References No definition available. + Details
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- Definition Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122739-111746 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 + Details
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