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Investments (Tables) | 3 Months Ended
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Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Investments by contractual maturity |
|  | March 31, 2021
Available-for-Sale Securities |  | Amortized Cost |  | Estimated Fair Value
Within one year |  | $ | 301 |  |  | $ | 305 |
After one year through five years |  | 3,285 |  |  | 3,612 |
After five years through ten years |  | 24,932 |  |  | 26,876 |
After ten years |  | 379,670 |  |  | 382,690 |
|  | 408,188 |  |  | 413,483 |
Investment securities not due at a single maturity date: |  |  |  |
U.S. Government agencies |  | 644 |  |  | 655 |
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  | 212,364 |  |  | 214,386 |
Private label mortgage and asset backed securities |  | 108,053 |  |  | 107,920 |
Corporate debt securities |  | 32,000 |  |  | 32,275 |
Total available-for-sale |  | $ | 761,249 |  |  | $ | 768,719 |
Available-for-sale securities reconciliation | The following table sets forth the carrying values and estimated fair values of our investment securities portfolio at the dates indicated (in thousands):
|  | March 31, 2021
Available-for-Sale Securities |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Debt securities: |  |  |  |  |  |  |  |
U.S. Government agencies |  | $ | 644 |  |  | $ | 11 |  |  | $ | — |  |  | $ | 655 |
Obligations of states and political subdivisions |  | 408,188 |  |  | 10,458 |  |  | (5,163) |  |  | 413,483 |
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  | 212,364 |  |  | 3,186 |  |  | (1,164) |  |  | 214,386 |
Private label mortgage and asset backed securities |  | 108,053 |  |  | 1,263 |  |  | (1,396) |  |  | 107,920 |
Corporate debt securities |  | 32,000 |  |  | 444 |  |  | (169) |  |  | 32,275 |
Total available-for-sale |  | $ | 761,249 |  |  | $ | 15,362 |  |  | $ | (7,892) |  |  | $ | 768,719 |
|  | December 31, 2020
Available-for-Sale Securities |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Debt securities: |  |  |  |  |  |  |  |
U.S. Government agencies |  | $ | 651 |  |  | $ | 29 |  |  | $ | — |  |  | $ | 680 |
Obligations of states and political subdivisions |  | 361,734 |  |  | 18,170 |  |  | (339) |  |  | 379,565 |
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  | 214,203 |  |  | 3,575 |  |  | (1,480) |  |  | 216,298 |
Private label mortgage and asset backed securities |  | 82,413 |  |  | 1,337 |  |  | (242) |  |  | 83,508 |
Corporate debt securities |  | 30,000 |  |  | 260 |  |  | (219) |  |  | 30,041 |
Total available-for-sale |  | $ | 689,001 |  |  | $ | 23,371 |  |  | $ | (2,280) |  |  | $ | 710,092 |
Realized gains and losses | Proceeds and gross realized gains (losses) from the sales or calls of investment securities for the periods ended March 31, 2021 and 2020 are shown below (in thousands):
|  |  |  | For the Three Months Ended March 31,
Available-for-Sale Securities |  |  |  |  |  | 2021 |  | 2020
Proceeds from sales or calls |  |  |  |  |  | $ | — |  |  | $ | 106,037 |
Gross realized gains from sales or calls |  |  |  |  |  | — |  |  | 4,198 |
Gross realized losses from sales or calls |  |  |  |  |  | — |  |  | — |

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