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FAIR VALUE - Impairment of Valuation Adjustments were Recorded for Assets Recognized at Fair Value (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Servicing Asset at Fair Value, Amount | $ 32,304 |  | $ 32,304 |  | $ 27,191 | $ 25,255 | $ 26,502 | $ 26,244
Fair Value Measurements Nonrecurring [Member] | OREO [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets Fair Value Adjustment | (3,244) | $ (818) | (9,817) | $ (7,563) |  |  |  |
Fair Value Measurements Nonrecurring [Member] | Mortgage Servicing Rights [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets Fair Value Adjustment |  | (690) |  | (1,047) |  |  |  |
Fair Value Measurements Nonrecurring [Member] | Loans Held For Sale [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets Fair Value Adjustment | (10,102) |  | (14,642) |  |  |  |  |
Fair Value Measurements Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Assets Fair Value Adjustment | (7,967) | (686) | (20,622) | (23,467) |  |  |  |
Fair Value Inputs Level 1 [Member] | Fair Value Measurements Nonrecurring [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 0 | 0 | 0 | 0 |  |  |  |
Other Real Estate Owned | 0 | 0 | 0 | 0 |  |  |  |
Servicing Asset at Fair Value, Amount |  | 0 |  | 0 |  |  |  |
Loans held for sale | 0 |  | 0 |  |  |  |  |
Fair Value Inputs Level 2 [Member] | Fair Value Measurements Nonrecurring [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 0 | 0 | 0 | 0 |  |  |  |
Other Real Estate Owned | 0 | 0 | 0 | 0 |  |  |  |
Servicing Asset at Fair Value, Amount |  | 0 |  | 0 |  |  |  |
Loans held for sale | 0 |  | 0 |  |  |  |  |
Fair Value Inputs Level 3 [Member] | Fair Value Measurements Nonrecurring [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 442,248 | 374,740 | 442,248 | 374,740 |  |  |  |
Other Real Estate Owned | 135,218 | 152,977 | 135,218 | 152,977 |  |  |  |
Servicing Asset at Fair Value, Amount |  | $ 25,999 |  | $ 25,999 |  |  |  |
Loans held for sale | $ 44,177 |  | $ 44,177 |  |  |  |  |

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