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Investment Securities - Trust Preferred Securities (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) issuer | Dec. 31, 2020 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |
Total | $ 6,964,566 | $ 5,784,754
Fair Value | 7,027,950 | $ 5,970,115
Pooled Trust Preferred Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 13,751 |
Fair Value | 9,367 |
Unrealized Gain/ (Loss) | $ (4,384) |
Pooled Trust Preferred Securities | Pretsl XXVII LTD |  |
Debt Securities, Available-for-sale [Line Items] |  |
Pooled trust preferred securities, Class | B |
Lowest Credit Rating | BB |
Total | $ 4,197 |
Fair Value | 2,920 |
Unrealized Gain/ (Loss) | $ (1,277) |
Number of Issuers Currently Performing | issuer | 31 |
Number of Issuers Currently Remaining | issuer | 40 |
Actual Deferrals and Defaults as a % of Original Collateral | 12.30% |
Expected Defaults as a % of Remaining Performing Collateral | 13.50% |
Excess Subordination as a % of Current Performing Collateral | 40.80% |
Pooled Trust Preferred Securities | Trapeza Ser 13A |  |
Debt Securities, Available-for-sale [Line Items] |  |
Pooled trust preferred securities, Class | A2A |
Lowest Credit Rating | A |
Total | $ 9,554 |
Fair Value | 6,447 |
Unrealized Gain/ (Loss) | $ (3,107) |
Number of Issuers Currently Performing | issuer | 38 |
Number of Issuers Currently Remaining | issuer | 40 |
Actual Deferrals and Defaults as a % of Original Collateral | 4.50% |
Expected Defaults as a % of Remaining Performing Collateral | 6.20% |
Excess Subordination as a % of Current Performing Collateral | 61.20% |
Single Issuer Trust Preferred Securities | JP Morgan Chase & Co |  |
Debt Securities, Available-for-sale [Line Items] |  |
Lowest Credit Rating | BBB- |
Total | $ 4,819 |
Fair Value | 4,633 |
Unrealized Gain/ (Loss) | (186) |
Trust Preferred Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 18,570 |
Fair Value | 14,000 |
Unrealized Gain/ (Loss) | $ (4,570) |

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