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Investment Securities (Gross Realized Gains and Losses by Category) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |  |  |
Sale Price | $ 680,466 | $ 17,837 | $ 256,996
Book Value | 672,192 | 17,837 | 250,100
Available-For-Sale Securities, Gross Realized Gains | 8,274 | 0 | 6,896
Available-For-Sale, Securities Gross Realized Losses | 0 | 0 | 0
Securities Investment [Member] |  |  |
Investments, Debt and Equity Securities [Abstract] |  |  |
Book Value |  |  | 84,100
FNMA and FHLMC [Member] | Collateralized Mortgage Backed Securities [Member] |  |  |
Investments, Debt and Equity Securities [Abstract] |  |  |
Sale Price | 451,081 |  | 107,510
Book Value | 447,305 |  | 102,311
Available-For-Sale Securities, Gross Realized Gains | 3,776 |  | 5,199
Available-For-Sale, Securities Gross Realized Losses | 0 |  | 0
GNMA [Member] |  |  |
Investments, Debt and Equity Securities [Abstract] |  |  |
Book Value |  | 17,800 | 166,000
GNMA [Member] | Collateralized Mortgage Backed Securities [Member] |  |  |
Investments, Debt and Equity Securities [Abstract] |  |  |
Sale Price | 229,385 | 17,837 | 65,284
Book Value | 224,887 | 17,837 | 63,704
Available-For-Sale Securities, Gross Realized Gains | 4,498 | 0 | 1,580
Available-For-Sale, Securities Gross Realized Losses | $ 0 | $ 0 | 0
US Treasury Securities [Member] | Securities Investment [Member] |  |  |
Investments, Debt and Equity Securities [Abstract] |  |  |
Sale Price |  |  | 84,202
Book Value |  |  | 84,085
Available-For-Sale Securities, Gross Realized Gains |  |  | 117
Available-For-Sale, Securities Gross Realized Losses |  |  | $ 0

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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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