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Investments (Tables) | 9 Months Ended
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Sep. 30, 2021
Investments [Abstract] |
Debt Securities, Available-for-sale |
| September 30, 2021 | December 31, 2020
Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Estimated Fair Value | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Estimated Fair Value
Securities available-for-sale: |  |  |  |  |  |  |  |
Obligations of states and |  |  |  |  |  |  |  |
political subdivisions | $ | 267,923 |  | $ | 7,750 |  | $ | 589 |  | $ | 275,084 |  | $ | 266,483 |  | $ | 11,467 |  | $ | 139 |  | $ | 277,811 |
Mortgage-backed securities: |  |  |  |  |  |  |  |
U.S. government agencies | 1,038,806 |  | 20,906 |  | 5,289 |  | 1,054,423 |  | 815,682 |  | 34,807 |  | 105 |  | 850,384 |
Private label | 8,864 |  | 701 |  | — |  | 9,565 |  | 9,976 |  | 916 |  | — |  | 10,892 |
Trust preferred securities | 4,567 |  | — |  | 118 |  | 4,449 |  | 4,557 |  | — |  | 457 |  | 4,100 |
Corporate securities | 27,337 |  | 1,221 |  | 2 |  | 28,556 |  | 31,465 |  | 2,146 |  | 1 |  | 33,610 |
Total Securities Available-for-Sale | $ | 1,347,497 |  | $ | 30,578 |  | $ | 5,998 |  | $ | 1,372,077 |  | $ | 1,128,163 |  | $ | 49,336 |  | $ | 702 |  | $ | 1,176,797 |
Gross Unrealized Losses And Fair Value Of Investments | The following table shows the gross unrealized losses and fair value of the Company’s investments aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands):
| September 30, 2021
Less Than Twelve Months | Twelve Months or Greater | Total
Estimated Fair Value | Unrealized Loss | Estimated Fair Value | Unrealized Loss | Estimated Fair Value | Unrealized Loss
Securities available-for-sale: |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 58,991 |  | $ | 516 |  | $ | 2,410 |  | $ | 73 |  | $ | 61,401 |  | $ | 589 |
Mortgage-backed securities: |  |  |  |  |  |
U.S. Government agencies | 515,972 |  | 5,281 |  | 23,296 |  | 8 |  | 539,268 |  | 5,289 |
Trust preferred securities | — |  | — |  | 4,449 |  | 118 |  | 4,449 |  | 118 |
Corporate securities | 998 |  | 2 |  | — |  | — |  | 998 |  | 2 |
Total available-for-sale | $ | 575,961 |  | $ | 5,799 |  | $ | 30,155 |  | $ | 199 |  | $ | 606,116 |  | $ | 5,998 |
| December 31, 2020
Less Than Twelve Months | Twelve Months or Greater | Total
Estimated Fair Value | Unrealized Loss | Estimated Fair Value | Unrealized Loss | Estimated Fair Value | Unrealized Loss
Securities available-for-sale: |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 10,578 |  | $ | 139 |  | $ | — |  | $ | — |  | $ | 10,578 |  | $ | 139 |
Mortgage-backed securities: |  |  |  |  |  |
U.S. Government agencies | 62,412 |  | 105 |  | 35 |  | — |  | 62,447 |  | 105 |
Trust preferred securities | — |  | — |  | 4,100 |  | 457 |  | 4,100 |  | 457 |
Corporate securities | 488 |  | 1 |  | — |  | — |  | 488 |  | 1 |
Total available-for-sale | $ | 73,478 |  | $ | 245 |  | $ | 4,135 |  | $ | 457 |  | $ | 77,613 |  | $ | 702 |
Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity | The amortized cost and estimated fair value of debt securities at September 30, 2021, by contractual maturity, is shown in the following table (in thousands). Expected maturities will differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties. Mortgage-backed securities have been allocated to their respective maturity groupings based on their contractual maturity.
| Amortized Cost | Estimated Fair Value
Available-for-Sale Debt Securities |  |
Due in one year or less | $ | 3,829 |  | $ | 3,888 |
Due after one year through five years | 42,608 |  | 44,755 |
Due after five years through ten years | 248,098 |  | 259,506 |
Due after ten years | 1,052,962 |  | 1,063,928 |
Total | $ | 1,347,497 |  | $ | 1,372,077 |
Gross Gains And Losses Realized | Gross gains and gross losses recognized by the Company from investment security transactions are summarized in the table below (in thousands):
| Three months ended September 30, | Nine months ended September 30,
| 2021 | 2020 | 2021 | 2020
Gross realized gains on securities sold | $ | — |  | $ | — |  | $ | 312 |  | $ | 133 |
Gross realized losses on securities sold | — |  | — |  | — |  | (77) |
Net investment security gains (losses) | $ | — |  | $ | — |  | $ | 312 |  | $ | 56 |
Gross unrealized gains recognized on equity securities still held | $ | 100 |  | $ | 461 |  | $ | 481 |  | $ | 170 |
Gross unrealized losses recognized on equity securities still held | (7) |  | — |  | (29) |  | (1,868) |
Net unrealized gains (losses) recognized on equity securities still held | $ | 93 |  | $ | 461 |  | $ | 452 |  | $ | (1,698) |

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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563 + Details
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