v3.21.2

Investment in Securities (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | $ 19,200,000 |  | $ 19,200,000 |  | $ 24,900,000
Debt Securities, Available-for-sale, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  |  |  |  | 2,600,000
Available-for-sale securities Realizes Losses - Write offs | (300,000) | $ (2,500,000) | (1,500,000) | $ (16,300,000) |
Catch-up premium amortization adjustment | (2,900,000) | 300,000 | 10,000 | (4,400,000) |
Residential mortgage loans | Loans held-for-investment [Member] |  |  |  |  |
Securities, Available-for-sale [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 1,500,000 |  | 1,500,000 |  | $ 2,200,000
Realized Losses, Write offs on loans |  | $ (51,000) | $ (33,000) | $ (500,000) |

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- Definition For securities whose cash flows vary depending on prepayments, an effective yield retroactive to the time of purchase is periodically recomputed based on actual prepayments and changes in projected prepayment activity, and a catch-up adjustment, or "Catch-up Premium Amortization Adjustment," is made to amortization to reflect the cumulative impact of the change in effective yield. + References No definition available. + Details
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