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Securities - Amortized Cost and Estimated Fair Value of Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Securities available-for-sale: |  |
Amortized Cost | $ 314,905 | $ 402,537
Gross Unrealized Gains | 8,660 | 2,459
Gross Unrealized (Losses) |  | (171)
Allowances for Credit Losses |  | 404,825
Estimated Fair Value | 323,565 | 404,825
Agency mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 225,429 | 283,598
Gross Unrealized Gains | 6,906 | 934
Gross Unrealized (Losses) |  | (171)
Allowances for Credit Losses |  | 284,361
Estimated Fair Value | 232,335 | 284,361
U.S. Treasury |  |
Securities available-for-sale: |  |
Amortized Cost | 89,476 | 118,939
Gross Unrealized Gains | 1,754 | 1,525
Allowances for Credit Losses |  | 120,464
Estimated Fair Value | $ 91,230 | $ 120,464

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