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FAIR VLUE - Assets and Liabilites Measured at Fair Value on Recurring Basis Using Unobservable Inputs (Level 3) (Detail) $ in Thousands | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | ---
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale | $ 2,011,221 | $ 1,891,016
Minimum [Member] | Private label MBS [Member] | Measurement Input, Discount Rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.148 | 0.14
Minimum [Member] | Private label MBS [Member] | Measurement Input, Loss Severity [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0 | 0
Maximum [Member] | Private label MBS [Member] | Measurement Input, Discount Rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.148 | 0.14
Maximum [Member] | Private label MBS [Member] | Measurement Input, Loss Severity [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.078 | 0.068
Weighted Average [Member] | Private label MBS [Member] | Measurement Input, Discount Rate [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.148 | 0.14
Weighted Average [Member] | Private label MBS [Member] | Measurement Input, Loss Severity [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.04 | 0.03
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Private label MBS [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale | $ 14,571 | $ 17,060
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Private label MBS [Member] | Measurement Input, Discount Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.148 | 0.14
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | US States And Political Subdivisions Member [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale | $ 2,798 | $ 2,695
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | US States And Political Subdivisions Member [Member] | Measurement Input, Discount Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.059 | 0.0661
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | US States And Political Subdivisions Member [Member] | Measurement Input, Constant Prepayment Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.03 | 0.03
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Private label MBS [Member] | Measurement Input, Constant Prepayment Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.035 | 0.12
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Minimum [Member] | Private label MBS [Member] | Measurement Input, Loss Severity [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Private label MBS [Member] | Measurement Input, Constant Prepayment Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.225 | 0.29
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Maximum [Member] | Private label MBS [Member] | Measurement Input, Loss Severity [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.078 | 0.068
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Private label MBS [Member] | Measurement Input, Constant Prepayment Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.117 | 0.164
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Weighted Average [Member] | Private label MBS [Member] | Measurement Input, Loss Severity [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |
Debt Securities, Available-for-sale, Sale [Abstract] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.04 | 0.03

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