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Investments (Tables) | 9 Months Ended
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Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Investments by contractual maturity |
|  | September 30, 2021
Available-for-Sale Securities |  | Amortized Cost |  | Estimated Fair Value
Within one year |  | $ | — |  |  | $ | — |
After one year through five years |  | 3,349 |  |  | 3,659 |
After five years through ten years |  | 94,640 |  |  | 97,424 |
After ten years |  | 406,424 |  |  | 416,847 |
|  | 504,413 |  |  | 517,930 |
Investment securities not due at a single maturity date: |  |  |  |
U.S. Government agencies |  | 489 |  |  | 505 |
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  | 226,027 |  |  | 228,045 |
Private label mortgage and asset backed securities |  | 255,324 |  |  | 253,756 |
Corporate debt securities |  | 59,500 |  |  | 60,126 |
Total available-for-sale |  | $ | 1,045,753 |  |  | $ | 1,060,362 |
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):
|  | September 30, 2021
Available-for-Sale Securities |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Debt securities: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 9,988 |  |  | $ | 22 |  |  | $ | — |  |  | $ | 10,010 |
U.S. Government agencies |  | 489 |  |  | 16 |  |  | — |  |  | 505 |
Obligations of states and political subdivisions |  | 494,425 |  |  | 15,844 |  |  | (2,349) |  |  | 507,920 |
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  | 226,027 |  |  | 2,837 |  |  | (819) |  |  | 228,045 |
Private label mortgage and asset backed securities |  | 255,324 |  |  | 1,184 |  |  | (2,752) |  |  | 253,756 |
Corporate debt securities |  | 59,500 |  |  | 878 |  |  | (252) |  |  | 60,126 |
Total available-for-sale |  | $ | 1,045,753 |  |  | $ | 20,781 |  |  | $ | (6,172) |  |  | $ | 1,060,362 |
|  | 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 September 30, 2021 and 2020 are shown below (in thousands):
|  | For the Three Months Ended September 30, |  | For the Nine Months Ended September 30,
Available-for-Sale Securities |  | 2021 |  | 2020 |  | 2021 |  | 2020
Proceeds from sales or calls |  | $ | 10,170 |  |  | $ | 25,442 |  |  | $ | 10,760 |  |  | $ | 147,811 |
Gross realized gains from sales or calls |  | 117 |  |  | 1,035 |  |  | 117 |  |  | 5,539 |
Gross realized losses from sales or calls |  | — |  |  | (978) |  |  | (79) |  |  | (1,342) |

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