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Investments (Tables) | 12 Months Ended
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Dec. 31, 2024
Investments [Abstract] |
Investment |
| December 31, 2024 | December 31, 2023
| 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 | $ | 199,131 |  | $ | 139 |  | $ | 15,519 |  | $ | 183,751 |  | $ | 228,456 |  | $ | 371 |  | $ | 16,089 |  | $ | 212,738 |
Mortgage-backed securities: |  |  |  |  |  |  |  |
U.S. government agencies | 1,334,755 |  | 1,993 |  | 134,667 |  | 1,202,081 |  | 1,211,484 |  | 2,362 |  | 125,753 |  | 1,088,093 |
Private label | 5,096 |  | — |  | 163 |  | 4,933 |  | 6,997 |  | — |  | 293 |  | 6,704 |
Trust preferred securities | 4,605 |  | 141 |  | — |  | 4,746 |  | 4,599 |  | — |  | 321 |  | 4,278 |
Corporate securities | 26,862 |  | 144 |  | 1,211 |  | 25,795 |  | 28,009 |  | 137 |  | 1,822 |  | 26,324 |
Total Securities |  |  |  |  |  |  |  |
Available-for-Sale | $ | 1,570,449 |  | $ | 2,417 |  | $ | 151,560 |  | $ | 1,421,306 |  | $ | 1,479,545 |  | $ | 2,870 |  | $ | 144,278 |  | $ | 1,338,137 |
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):
| December 31, 2024
| 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 | $ | 19,724 |  | $ | 422 |  | $ | 151,508 |  | $ | 15,097 |  | $ | 171,232 |  | $ | 15,519 |
Mortgage-backed securities: |  |  |  |  |  |
U.S. Government agencies | 114,560 |  | 12,669 |  | 710,651 |  | 121,998 |  | 825,211 |  | 134,667 |
Private Label | — |  | — |  | 4,933 |  | 163 |  | 4,933 |  | 163 |
Trust preferred securities | — |  | — |  | — |  | — |  | — |  | — |
Corporate securities | — |  | — |  | 24,035 |  | 1,211 |  | 24,035 |  | 1,211 |
Total available-for-sale | $ | 134,284 |  | $ | 13,091 |  | $ | 891,127 |  | $ | 138,469 |  | $ | 1,025,411 |  | $ | 151,560 |
| December 31, 2023
| 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 | $ | 7,591 |  | $ | 66 |  | $ | 180,560 |  | $ | 16,023 |  | $ | 188,151 |  | $ | 16,089 |
Mortgage-backed securities: |  |  |  |  |  |
U.S. Government agencies | 2,046 |  | 10,271 |  | 741,011 |  | 115,482 |  | 743,057 |  | 125,753 |
Private Label | — |  | — |  | 4,738 |  | 293 |  | 4,738 |  | 293 |
Trust preferred securities | — |  | — |  | 4,278 |  | 321 |  | 4,278 |  | 321 |
Corporate securities | — |  | — |  | 24,609 |  | 1,822 |  | 24,609 |  | 1,822 |
Total available-for-sale | $ | 9,637 |  | $ | 10,337 |  | $ | 955,196 |  | $ | 133,941 |  | $ | 964,833 |  | $ | 144,278 |
Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity | The amortized cost and estimated fair value of debt securities at December 31, 2024, 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.
| Cost | Estimated Fair Value
Securities Available-for-Sale |  |
Due in one year or less | $ | 15,521 |  | $ | 15,409 |
Due after one year through five years | 153,680 |  | 145,551 |
Due after five years through ten years | 316,167 |  | 293,665 |
Due after ten years | 1,085,081 |  | 966,681 |
| $ | 1,570,449 |  | $ | 1,421,306 |
Gross Gains And Losses Realized |
| For the year ended December 31,
| 2024 | 2023 | 2022
Proceeds on sales of available for sale securities | $ | 33,394 |  | $ | 205,627 |  | $ | — |
Gross unrealized gains recognized on equity securities still held | $ | 517 |  | $ | 769 |  | $ | 38 |
Gross unrealized losses recognized on equity securities still held | (342) |  | (337) |  | (1,623) |
Net unrealized gains (losses) recognized on equity securities still held | $ | 175 |  | $ | 432 |  | $ | (1,585) |
Gross realized gains | $ | 5 |  | $ | 996 |  | $ | 4 |
Gross realized losses | (2,830) |  | (5,904) |  | — |
Net realized investment security (losses) gains | $ | (2,825) |  | $ | (4,908) |  | $ | 4 |

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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + Details
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