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Investment Securities - Trust Preferred Securities (Detail) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) issuer | Dec. 31, 2020 USD ($)
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Total | $ 6,660,220 | $ 5,784,754
Fair Value | 6,724,530 | $ 5,970,115
Pooled Trust Preferred Securities |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Total | 13,753 |
Fair Value | 8,210 |
Unrealized Gain/ (Loss) | $ (5,543) |
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 | BB |
Total | $ 4,208 |
Fair Value | 2,415 |
Unrealized Gain/ (Loss) | $ (1,793) |
Number of Issuers Currently Performing | issuer | 32 |
Number of Issuers Currently Remaining | issuer | 41 |
Actual Deferrals and Defaults as a % of Original Collateral | 14.40% |
Expected Defaults as a % of Remaining Performing Collateral | 10.60% |
Excess Subordination as a % of Current Performing Collateral | 42.10% |
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 | A |
Total | $ 9,545 |
Fair Value | 5,795 |
Unrealized Gain/ (Loss) | $ (3,750) |
Number of Issuers Currently Performing | issuer | 39 |
Number of Issuers Currently Remaining | issuer | 41 |
Actual Deferrals and Defaults as a % of Original Collateral | 4.50% |
Expected Defaults as a % of Remaining Performing Collateral | 6.50% |
Excess Subordination as a % of Current Performing Collateral | 60.70% |
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 | $ 4,813 |
Fair Value | 4,554 |
Unrealized Gain/ (Loss) | (259) |
Trust Preferred Securities |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Total | 18,566 |
Fair Value | 12,764 |
Unrealized Gain/ (Loss) | $ (5,802) |

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