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Investment Securities (Gross Realized Gains and Losses by Category) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract] |  |
Sale Price | $ 0 | $ 320,984
Book Value at Sale |  | 316,256
Gross Gains |  | 4,728
Gross Losses |  | 0
FNMA and FHLMC [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Investments, Debt and Equity Securities [Abstract] |  |
Sale Price |  | 229,571
Book Value at Sale |  | 227,213
Gross Gains |  | 2,358
Gross Losses |  | 0
GNMA [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Investments, Debt and Equity Securities [Abstract] |  |
Sale Price |  | 91,413
Book Value at Sale |  | 89,043
Gross Gains |  | 2,370
Gross 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=121553693&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=121586364&loc=d3e3179-108585 + Details
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