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Investment Securities (Gross Realized Gains and Losses by Category) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract] |  |
Sale Price | $ 320,984 | $ 0
Book Value | 316,256 |
Available-For-Sale Securities, Gross Realized Gains | 4,728 |
Available-For-Sale, Securities Gross Realized Losses | 0 |
FNMA and FHLMC [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Investments, Debt and Equity Securities [Abstract] |  |
Sale Price | 229,571 |
Book Value | 227,213 |
Available-For-Sale Securities, Gross Realized Gains | 2,358 |
Available-For-Sale, Securities Gross Realized Losses | 0 |
GNMA [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Investments, Debt and Equity Securities [Abstract] |  |
Sale Price | 91,413 |
Book Value | 89,043 |
Available-For-Sale Securities, Gross Realized Gains | 2,370 |
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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