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Investment Securities (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Schedule of Investments [Line Items] |  |  |  |  |
Other than Temporary Impairment Losses, Investments |  |  | $ 0 | $ 0 |
Asset backed securities mortgage portfolio, term |  |  | 15 years |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 980,047,000 |  | $ 980,047,000 |  | $ 1,187,499,000
Debt Securities, Available-for-sale, Realized Gain (Loss) | (27,000) | $ 186,000 | 3,286,000 | (421,000) |
Debt Securities, Available-for-sale, Realized Gain | 37,000 | 253,000 | 3,400,000 | 271,000 |
Debt Securities, Available-for-sale, Realized Loss | 64,000 | 67,000 | 64,000 | 692,000 |
Debt Securities, Held-to-maturity, Transfer, Amount |  |  |  | 373,900,000 |
Debt Securities, Available for Sale, Sold at Gain, Amortized Cost Amount | 140,900,000 | 23,800,000 | 196,400,000 | 29,100,000 |
Debt Securities, Available for Sale, Sold at Loss, Amortized Cost Amount | 112,500,000 | $ 10,700,000 | 112,500,000 | $ 62,400,000 |
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 698,237,000 |  | 698,237,000 |  | 884,571,000
Collateral Pledged [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Restricted | $ 688,000,000 |  | $ 688,000,000 |  | $ 585,000,000

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details
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