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Investment Securities - Trust Preferred Securities (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) security | Dec. 31, 2019 USD ($)
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Total | $ 5,784,754 | $ 5,313,209
Fair Value | 5,970,115 | $ 5,385,091
Pooled Trust Preferred Securities |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Total | 13,763 |
Fair Value | 7,913 |
Available-for-Sale, Unrealized Gain/ (Loss) | $ (5,850) |
Pooled Trust Preferred Securities | Pretsl XXVII LTD |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Pooled trust preferred securities, Class | B |
Lowest Credit Rating | B |
Total | $ 4,223 |
Fair Value | 2,331 |
Available-for-Sale, Unrealized Gain/ (Loss) | $ (1,892) |
Number of Issuers Currently Performing | security | 32 |
Number Of Issuers Currently Remaining | security | 41 |
Actual Deferrals and Defaults as a Percent of Original Collateral | 14.40% |
Expected Defaults as a % of Remaining Performing Collateral | 10.80% |
Excess Subordination as a % of Current Performing Collateral | 35.10% |
Pooled Trust Preferred Securities | Trapeza Ser 13A |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Pooled trust preferred securities, Class | A2A |
Lowest Credit Rating | BBB |
Total | $ 9,540 |
Fair Value | 5,582 |
Available-for-Sale, Unrealized Gain/ (Loss) | $ (3,958) |
Number of Issuers Currently Performing | security | 39 |
Number Of Issuers Currently Remaining | security | 41 |
Actual Deferrals and Defaults as a Percent of Original Collateral | 4.50% |
Expected Defaults as a % of Remaining Performing Collateral | 6.40% |
Excess Subordination as a % of Current Performing Collateral | 52.00% |
Single Issuer Trust Preferred Securities | JP Morgan Chase & Co |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Lowest Credit Rating | BBB- |
Total | $ 4,809 |
Fair Value | 4,463 |
Available-for-Sale, Unrealized Gain/ (Loss) | (346) |
Trust Preferred Securities |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Total | 18,572 |
Fair Value | 12,376 |
Available-for-Sale, Unrealized Gain/ (Loss) | $ (6,196) |

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