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Investments | 6 Months Ended
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Jun. 30, 2024
Investments [Abstract] |
Investments | Investments The aggregate carrying and approximate fair values of investment securities follow (in thousands). Fair values are based on quoted market prices, where available. If quoted market prices are not available, fair values are based on quoted market prices of comparable financial instruments.
| June 30, 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 | $ | 226,055 |  | $ | 154 |  | $ | 18,423 |  | $ | 207,786 |  | $ | 228,456 |  | $ | 371 |  | $ | 16,089 |  | $ | 212,738 |
Mortgage-backed securities: |  |  |  |  |  |  |  |
U.S. government agencies | 1,348,238 |  | 1,027 |  | 137,752 |  | 1,211,513 |  | 1,211,484 |  | 2,362 |  | 125,753 |  | 1,088,093 |
Private label | 6,709 |  | — |  | 262 |  | 6,447 |  | 6,997 |  | — |  | 293 |  | 6,704 |
Trust preferred securities | 4,602 |  | — |  | 9 |  | 4,593 |  | 4,599 |  | — |  | 321 |  | 4,278 |
Corporate securities | 27,932 |  | 31 |  | 1,617 |  | 26,346 |  | 28,009 |  | 137 |  | 1,822 |  | 26,324 |
Total Securities Available-for-Sale | $ | 1,613,536 |  | $ | 1,212 |  | $ | 158,063 |  | $ | 1,456,685 |  | $ | 1,479,545 |  | $ | 2,870 |  | $ | 144,278 |  | $ | 1,338,137 |
The Company's other investment securities include marketable equity securities and non-marketable equity securities held for investment. At June 30, 2024 and December 31, 2023, the Company held $7.6 million and $7.5 million, respectively, in marketable equity securities. Changes in the fair value of the marketable equity securities are recorded in "unrealized (losses) gains recognized on equity securities still held" in the consolidated statements of income. The Co mpany's non-marketable securities consist of securities with limited marketability, such as stock in the Federal Reserve Bank ("FRB") or the Federal Home Loan Bank ("FHLB"). At June 30, 2024 and December 31, 2023, the Company held $23.6 million and $23.5 million, respectively, in non-marketable equity securities. These securities are carried at cost due to the restrictions placed on their transferability. The Company held no certificates of deposits for investment at June 30, 2024 and at December 31, 2023. The majority of the Company's investment securities are mortgage-backed. These securities are collateralized by both residential and commercial properties. The mortgage-backed securities in which the Company has invested are predominantly issued by government-sponsored agencies such as Fannie Mae, Freddie Mac, and Ginnie Mae. At June 30, 2024 and December 31, 2023 there were no securities of any non-governmental issuer whose aggregate carrying value or estimated fair value exceeded 10% of shareholders' equity. Certain investment securities owned by the Company were in an unrealized loss position (i.e., amortized cost basis exceeded the estimated fair value of the securities) as of June 30, 2024 and December 31, 2023. 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):
| June 30, 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 | $ | 17,733 |  | $ | 505 |  | $ | 179,538 |  | $ | 17,918 |  | $ | 197,271 |  | $ | 18,423 |
Mortgage-backed securities: |  |  |  |  |  |
U.S. Government agencies | 102,346 |  | 10,002 |  | 708,833 |  | 127,750 |  | 811,179 |  | 137,752 |
Private label | 1,586 |  | 15 |  | 4,861 |  | 247 |  | 6,447 |  | 262 |
Trust preferred securities | — |  | — |  | 4,593 |  | 9 |  | 4,593 |  | 9 |
Corporate securities | — |  | — |  | 24,719 |  | 1,617 |  | 24,719 |  | 1,617 |
Total available-for-sale | $ | 121,665 |  | $ | 10,522 |  | $ | 922,544 |  | $ | 147,541 |  | $ | 1,044,209 |  | $ | 158,063 |
| 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 |  | 740,914 |  | 115,482 |  | 742,960 |  | 125,753 |
Private label | — |  | — |  | 4,835 |  | 293 |  | 4,835 |  | 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 |
As of June 30, 2024, management does not intend to sell any impaired security and it is not more than likely that it will be required to sell any impaired security before the recovery of its amortized cost basis. The unrealized losses on debt securities are primarily the result of interest rate changes, credit spread fluctuations on agency-issued mortgage-related securities, general financial market uncertainty and market volatility. These conditions should not prohibit the Company from receiving its contractual principal and interest payments on its debt securities. The fair value is expected to recover as the securities a pproach their maturity date or repricing date. Due to the previously mentioned factors, as of June 30, 2024, management believes the unrealized losses detailed in the table above are temporary and therefore no allowance for credit losses has been recognized on the Company’s securities. Should the impairment of any of these securities become other-than-temporary, the cost basis of the investment will be reduced and the resulting loss will be recognized in net income in the period the other-than-temporary impairment is identified, while any noncredit loss will be recognized in other comprehensive income. During the three and six months ended June 30, 2024 and 2023, the Company had no credit-related net investment impairment losses. The amortized cost and estimated fair value of debt securities at June 30, 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.
| Amortized Cost | Estimated Fair Value
Available-for-Sale Debt Securities |  |
Due in one year or less | $ | 3,078 |  | $ | 3,046 |
Due after one year through five years | 119,763 |  | 113,772 |
Due after five years through ten years | 388,186 |  | 358,188 |
Due after ten years | 1,102,509 |  | 981,679 |
Total | $ | 1,613,536 |  | $ | 1,456,685 |
Proceeds from sales, gross gains and gross losses recognized by the Company from investment security transactions are summarized in the table below (in thousands):
|  | Three months ended June 30, |  | Six months ended June 30,
|  | 2024 | 2023 |  | 2024 | 2023
Proceeds on sales of available for sale securities |  | $ | — |  | $ | — |  |  | $ | — |  | $ | 85,559 |
Gross realized gains on securities sold |  | $ | — |  | $ | — |  |  | $ | — |  | $ | 975 |
Gross realized losses on securities sold |  | — |  | — |  |  | (1) |  | (202) |
Net realized investment security gains |  | $ | — |  | $ | — |  |  | $ | (1) |  | $ | 773 |
Gross unrealized gains recognized on equity securities still held |  | $ | 375 |  | $ | 8 |  |  | $ | 247 |  | $ | 368 |
Gross unrealized losses recognized on equity securities still held |  | (11) |  | (302) |  |  | (35) |  | (301) |
Net unrealized (losses) gains recognized on equity securities still held |  | $ | 364 |  | $ | (294) |  |  | $ | 212 |  | $ | 67 |
The carrying value of securities pledged to secure public deposits and for other purposes as required or permitted by law approximated $700 million and $709 million at June 30, 2024 and December 31, 2023, respectively.

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- Definition The entire disclosure for investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/320/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Topic 321 -Publisher FASB -URI https://asc.fasb.org/321/tableOfContent Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Topic 325 -Publisher FASB -URI https://asc.fasb.org/325/tableOfContent + Details
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