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Investments (Tables) | 3 Months Ended
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Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract] |
Investments by contractual maturity |
|  | March 31, 2022
Available-for-Sale Securities |  | Amortized Cost |  | Estimated Fair Value
Within one year |  | $ | — |  |  | $ | — |
After one year through five years |  | 3,727 |  |  | 3,877 |
After five years through ten years |  | 98,715 |  |  | 92,825 |
After ten years |  | 346,536 |  |  | 321,685 |
|  | 448,978 |  |  | 418,387 |
Investment securities not due at a single maturity date: |  |  |  |
U.S. Government agencies |  | 356 |  |  | 344 |
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  | 226,466 |  |  | 221,304 |
Private label mortgage and asset backed securities |  | 508,430 |  |  | 475,813 |
Corporate debt securities |  | 47,500 |  |  | 45,908 |
Total available-for-sale |  | $ | 1,231,730 |  |  | $ | 1,161,756 |
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, 2022
Available-for-Sale Securities |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Debt securities: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 9,988 |  |  | $ | — |  |  | $ | (730) |  |  | $ | 9,258 |
U.S. Government agencies |  | 356 |  |  | — |  |  | (12) |  |  | 344 |
Obligations of states and political subdivisions |  | 438,990 |  |  | 1,543 |  |  | (31,404) |  |  | 409,129 |
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  | 226,466 |  |  | 329 |  |  | (5,491) |  |  | 221,304 |
Private label mortgage and asset backed securities |  | 508,430 |  |  | 308 |  |  | (32,925) |  |  | 475,813 |
Corporate debt securities |  | 47,500 |  |  | 205 |  |  | (1,797) |  |  | 45,908 |
Total available-for-sale |  | $ | 1,231,730 |  |  | $ | 2,385 |  |  | $ | (72,359) |  |  | $ | 1,161,756 |
|  | December 31, 2021
Available-for-Sale Securities |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Debt securities: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 9,988 |  |  | $ | — |  |  | $ | (63) |  |  | $ | 9,925 |
U.S. Government agencies |  | 373 |  |  | 6 |  |  | — |  |  | 379 |
Obligations of states and political subdivisions |  | 512,952 |  |  | 16,703 |  |  | (3,188) |  |  | 526,467 |
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  | 213,471 |  |  | 2,245 |  |  | (1,277) |  |  | 214,439 |
Private label mortgage and asset backed securities |  | 317,089 |  |  | 824 |  |  | (4,693) |  |  | 313,220 |
Corporate debt securities |  | 44,500 |  |  | 595 |  |  | (317) |  |  | 44,778 |
Total available-for-sale |  | $ | 1,098,373 |  |  | $ | 20,373 |  |  | $ | (9,538) |  |  | $ | 1,109,208 |
Realized gains and losses | Proceeds and gross realized gains (losses) from the sales or calls of investment securities for the periods ended March 31, 2022 and 2021 are shown below (in thousands):
|  |  |  | For the Three Months Ended March 31,
Available-for-Sale Securities |  |  |  |  |  | 2022 |  | 2021
Proceeds from sales or calls |  |  |  |  |  | $ | 132,991 |  |  | $ | — |
Gross realized gains from sales or calls |  |  |  |  |  | 206 |  |  | — |
Gross realized losses from sales or calls |  |  |  |  |  | — |  |  | — |

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