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Investment Securities (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Schedule of Investments [Line Items] |  |  |  |  |
Other than Temporary Impairment Losses, Investments |  |  | $ 0 | $ 0 |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,519,098,000 |  | 1,519,098,000 |  | $ 1,007,834,000
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | $ 0 |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% |  |
Debt Securities, Available for Sale, Sold at Gain, Amortized Cost Amount |  | $ 140,900,000 | $ 0 | 196,400,000 |
Debt Securities, Realized Gain (Loss) | 0 | (27,000) | 0 | 3,286,000 |
Debt Securities, Available for Sale, Sold at Loss, Amortized Cost Amount |  | 112,500,000 |  | 112,500,000 |
Debt Securities, Available-for-sale, Realized Gain |  | 37,000 |  | 3,400,000 |
Debt Securities, Available-for-sale, Realized Loss |  | $ 64,000 |  | $ 64,000 |
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 844,128,000 |  | 844,128,000 |  | 726,589,000
Collateral Pledged [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Restricted | $ 717,500,000 |  | $ 717,500,000 |  | $ 691,000,000

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