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INVESTMENT SECURITIES - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Schedule Of Investments [Line Items] |  |  |  |  |
Percentage Of Debt Securities Government And Government Sponsored Agencies | 99.00% |  | 99.00% |  |
Amortized cost | $ 1,798,373,000 |  | $ 1,798,373,000 |  | $ 1,975,230,000
Fair value | 1,803,688,000 |  | 1,803,688,000 |  | $ 1,942,568,000
Available for sale Securities [Member] | Private label MBS [Member] |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses | 0 | $ 0 | $ 0 | $ 0 |
Loans Receivable, Description of Variable Rate Basis |  |  | The interest rate on these private-label MBS is variable, tied to 3-month LIBOR and limited to the weighted-average coupon on the underlying collateral. |  |
Available for sale Securities [Member] | Private label MBS [Member] | FICO Score, Greater than 700 [Member] | LTV Less than 80 Percent [Member] |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Financing Receivable, Credit Quality, Additional Information |  |  | The underlying mortgages are fixed-rate, single-family loans with original FICO scores (over 700) and moderate loan-to-value ratios (under 80%), as well as moderate delinquency levels. |  |
Available for sale Securities [Member] | PRHFA [Member] | Zero-coupon bonds [Member] |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Amortized cost | 8,300,000 |  | $ 8,300,000 |  |
Fair value | 7,000,000.0 |  | 7,000,000.0 |  |
Available for sale Securities [Member] | PRHFA [Member] | Zero-coupon bonds [Member] | Residential pass-through mortgage-backed securities [Member] |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Amortized cost | 4,300,000 |  | 4,300,000 |  |
Fair value | $ 2,900,000 |  | $ 2,900,000 |  |
Held-to-maturity Securities [Member] |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Percentage Of Held To Maturity Securities | 70.00% |  | 70.00% |  |

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