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Securities Held-to-Maturity (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Held-to-Maturity |  |  |
Carrying Value | $ 88,699 | $ 76,363 |
Held-to-Maturity |  |  |
Held-to-Maturity |  |  |
Face Value | 111,028 | 103,515 |
Carrying Value | 88,699 | 76,363 |
Unrealized Gain | 3,039 | 2,734 |
Estimated Fair Value | 91,738 | 79,097 |
Impairment charges | 0 |  |
Interest income (including the amortization of discount) | $ 9,900 | $ 5,800 | $ 1,800
Held-to-Maturity | Seven B Piece Bonds |  |  |
Held-to-Maturity |  |  |
Bonds retained percentage | 49.00% |  |
Discounted value of bonds purchased | $ 74,700 |  |
Remaining of B Piece bond sold to the third party at par | 51.00% |  |
Estimated weighted average remaining maturity period | 5 years 9 months 18 days |  |
Initial face value of bonds purchased | $ 106,200 |  |
Held-to-Maturity | Agency B Piece Bonds |  |  |
Held-to-Maturity |  |  |
Weighted average variable interest rate (as a percent) | 3.74% |  |
Weighted average effective interest rate (as a percent) | 10.85% | 10.94% |
Held-to-maturity securities, estimated fiscal year |  |  |
Within one year | $ 14,200 |  |
After one year through five years | 40,800 |  |
After five years through ten years | 20,600 |  |
After ten years | 15,400 |  |
Held-to-Maturity | SFR bonds |  |  |
Held-to-Maturity |  |  |
Initial face value of bonds purchased | $ 20,000 |  |
Securities maturity term | 6 months |  |
Weighted average fixed interest rate | 4.58% |  |
Held-to-maturity securities, estimated fiscal year |  |  |
Within one year | $ 18,700 |  |
After one year through five years | $ 1,300 |  |

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