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Securities - Additional Information (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) Investment | Dec. 31, 2018 USD ($) Investment | Dec. 31, 2017 USD ($)
Schedule of Investments [Line Items] |  |  |  |
Federal Home Loan Bank stock, at cost | [1] | $ 647,562 | $ 644,590 |
Amortized cost from sales of held to maturity securities |  |  |  | $ 521,000
Proceeds from sales of held to maturity securities |  |  |  | 547,925
Gross realized gains from sales of held to maturity securities |  |  |  | 26,900
Securities transferred from held to maturity to available for sale |  |  |  | 3,040,305
Unrealized gain on securities transferred from held to maturity to available for sale |  |  |  | $ 82,800
Investment securities designated as having a continuous loss position for twelve months or more, unrealized losses |  | $ 14,800 | $ 22,500 |
Investment securities designated as having a continuous loss position for twelve months or more, percentage below collective amortized cost |  | 2.30% | 2.90% |
Investment securities designated as having a continuous loss position for twelve months or more, amortized cost |  | $ 642,300 | $ 782,400 |
Equity Securities, FV-NI, Unrealized Gain |  | $ 2,300 | $ 2,000 |
Mortgage-Related Securities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of investment securities designated as having a continuous loss position for twelve months or more | Investment |  | 3 | 9 |
Capital trust notes |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of investment securities designated as having a continuous loss position for twelve months or more | Investment |  | 5 | 5 |
Municipal bonds |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of investment securities designated as having a continuous loss position for twelve months or more | Investment |  | 1 | 3 |
Mutual Fund |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of investment securities designated as having a continuous loss position for twelve months or more | Investment |  | 1 | 1 |
US Government agencies securities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of investment securities designated as having a continuous loss position for twelve months or more | Investment |  | 7 | 9 |
Collateralized mortgage obligations |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of investment securities designated as having a continuous loss position for twelve months or more | Investment |  | 3 | 7 |
Corporate bonds |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of investment securities designated as having a continuous loss position for twelve months or more | Investment |  | 2 |  |
Asset-backed Securities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of investment securities designated as having a continuous loss position for twelve months or more | Investment |  | 3 |  |
[1] | Carrying value and estimated fair value are at cost.

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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
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