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Securities - Amortized Cost and Estimated Fair Value of Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Securities available-for-sale: |  |
Amortized Cost | $ 230,012 | $ 402,537
Gross Unrealized Gains | 5,762 | 2,459
Gross Unrealized (Losses) |  | (171)
Estimated Fair Value | 235,774 | 404,825
Agency mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 170,215 | 283,598
Gross Unrealized Gains | 5,111 | 934
Gross Unrealized (Losses) |  | (171)
Estimated Fair Value | 175,326 | 284,361
U.S. Treasury |  |
Securities available-for-sale: |  |
Amortized Cost | 59,797 | 118,939
Gross Unrealized Gains | 651 | 1,525
Estimated Fair Value | $ 60,448 | $ 120,464

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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