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Securities | 12 Months Ended
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Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |
Securities | Securities The amortized cost, gross unrealized gains and losses, and fair value of available-for-sale and held-to-maturity debt securities by type follows as of December 31,:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
2023 |  |  |  |  |  |  |
Available-for-sale: |  |  |  |  |  |  |
U.S. treasury | $ | 58,468 |  |  | $ | — |  |  | $ | (4,234) |  |  | $ | 54,234 |
U.S. agency | 1,872 |  |  | — |  |  | (33) |  |  | 1,839 |
Obligations of states and political subdivisions | 29,979 |  |  | — |  |  | (4,009) |  |  | 25,970 |
Mortgage backed - residential | 121,288 |  |  | 119 |  |  | (14,974) |  |  | 106,433 |
Collateralized mortgage obligations | 203,394 |  |  | — |  |  | (21,861) |  |  | 181,533 |
Mortgage backed - commercial | 145,062 |  |  | 497 |  |  | (14,367) |  |  | 131,192 |
Other debt | 16,792 |  |  | — |  |  | (1,236) |  |  | 15,556 |
Total available-for-sale | $ | 576,855 |  |  | $ | 616 |  |  | $ | (60,714) |  |  | $ | 516,757 |
Held-to-maturity: |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 25,542 |  |  | $ | 3 |  |  | $ | (3,987) |  |  | $ | 21,558 |
Mortgage backed - residential | 7,548 |  |  | 2 |  |  | (560) |  |  | 6,990 |
Collateralized mortgage obligations | 3,893 |  |  | — |  |  | (260) |  |  | 3,633 |
Total held-to-maturity | $ | 36,983 |  |  | $ | 5 |  |  | $ | (4,807) |  |  | $ | 32,181 |
2022 |  |  |  |  |  |  |
Available-for-sale: |  |  |  |  |  |  |
U.S. treasury | 62,010 |  |  | — |  |  | (5,361) |  |  | 56,649 |
U.S. agency | $ | 2,881 |  |  | $ | — |  |  | $ | (47) |  |  | $ | 2,834 |
Obligations of states and political subdivisions | 29,897 |  |  | — |  |  | (4,998) |  |  | 24,899 |
Mortgage backed - residential | 129,955 |  |  | 6 |  |  | (13,826) |  |  | 116,135 |
Collateralized mortgage obligations | 225,559 |  |  | — |  |  | (21,294) |  |  | 204,265 |
Mortgage backed - commercial | 130,997 |  |  | — |  |  | (13,661) |  |  | 117,336 |
Other debt | 16,774 |  |  | — |  |  | (1,919) |  |  | 14,855 |
Total available-for-sale | $ | 598,073 |  |  | $ | 6 |  |  | $ | (61,106) |  |  | $ | 536,973 |
Held-to-maturity: |  |  |  |  |  |  |
Obligations of states and political subdivisions | 25,378 |  |  | 5 |  |  | (4,891) |  |  | 20,492 |
Mortgage backed - residential | 8,705 |  |  | 4 |  |  | (511) |  |  | 8,198 |
Collateralized mortgage obligations | 4,818 |  |  | — |  |  | (290) |  |  | 4,528 |
Total held-to-maturity | $ | 38,901 |  |  | $ | 9 |  |  | $ | (5,692) |  |  | $ | 33,218 |
There was no allowance for credit losses related to our investment securities as of December 31, 2023. As of December 31, 2023 and 2022, there were no holdings of securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of stockholders’ equity. Fair value and unrealized losses on debt securities by type and length of time in a continuous unrealized loss position without an allowance for credit losses were as follows as of December 31,:
| Less than 12 months |  | 12 months or longer |  | Total
| Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Number of Securities
2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury | $ | — |  |  | $ | — |  |  | $ | 54,234 |  |  | $ | (4,234) |  |  | $ | 54,234 |  |  | $ | (4,234) |  |  | 9 |
U.S. agency | — |  |  | — |  |  | 1,839 |  |  | (33) |  |  | 1,839 |  |  | (33) |  |  | 7 |
Obligations of states and political subdivisions | — |  |  | — |  |  | 25,970 |  |  | (4,009) |  |  | 25,970 |  |  | (4,009) |  |  | 19 |
Mortgage backed - residential | — |  |  | — |  |  | 100,571 |  |  | (14,974) |  |  | 100,571 |  |  | (14,974) |  |  | 83 |
Collateralized mortgage obligations | — |  |  | — |  |  | 181,533 |  |  | (21,861) |  |  | 181,533 |  |  | (21,861) |  |  | 65 |
Mortgage backed - commercial | 4,721 |  |  | (27) |  |  | 114,625 |  |  | (14,340) |  |  | 119,346 |  |  | (14,367) |  |  | 24 |
Other debt | — |  |  | — |  |  | 15,556 |  |  | (1,236) |  |  | 15,556 |  |  | (1,236) |  |  | 9 |
Total available-for-sale | $ | 4,721 |  |  | $ | (27) |  |  | $ | 494,328 |  |  | $ | (60,687) |  |  | $ | 499,049 |  |  | $ | (60,714) |  |  | 216 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | — |  |  | $ | — |  |  | $ | 21,223 |  |  | $ | (3,987) |  |  | $ | 21,223 |  |  | $ | (3,987) |  |  | 8
Mortgage backed - residential | — |  |  | — |  |  | 6,845 |  |  | (560) |  |  | 6,845 |  |  | (560) |  |  | 10
Collateralized mortgage obligations | — |  |  | — |  |  | 3,633 |  |  | (260) |  |  | 3,633 |  |  | (260) |  |  | 5
Total held-to-maturity | $ | — |  |  | $ | — |  |  | $ | 31,701 |  |  | $ | (4,807) |  |  | $ | 31,701 |  |  | $ | (4,807) |  |  | 23
| Less than 12 months |  | 12 months or longer |  | Total
| Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Number of Securities
2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury | $ | 25,702 |  |  | $ | (967) |  |  | $ | 30,947 |  |  | $ | (4,394) |  |  | $ | 56,649 |  |  | $ | (5,361) |  |  | 10
U.S. agency | — |  |  | — |  |  | 2,834 |  |  | (47) |  |  | 2,834 |  |  | (47) |  |  | 7 |
Obligations of states and political subdivisions | 21,676 |  |  | (3,784) |  |  | 2,753 |  |  | (1,214) |  |  | 24,429 |  |  | (4,998) |  |  | 18 |
Mortgage backed - residential | 51,921 |  |  | (2,939) |  |  | 63,691 |  |  | (10,887) |  |  | 115,612 |  |  | (13,826) |  |  | 87 |
Collateralized mortgage obligations | 111,360 |  |  | (4,631) |  |  | 92,905 |  |  | (16,663) |  |  | 204,265 |  |  | (21,294) |  |  | 66 |
Mortgage backed - commercial | 70,710 |  |  | (6,475) |  |  | 46,626 |  |  | (7,186) |  |  | 117,336 |  |  | (13,661) |  |  | 22 |
Other debt | 14,855 |  |  | (1,919) |  |  | — |  |  | — |  |  | 14,855 |  |  | (1,919) |  |  | 9 |
Total available-for-sale | $ | 296,224 |  |  | $ | (20,715) |  |  | $ | 239,756 |  |  | $ | (40,391) |  |  | $ | 535,980 |  |  | $ | (61,106) |  |  | 219 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 20,153 |  |  | $ | (4,891) |  |  | $ | — |  |  | $ | — |  |  | $ | 20,153 |  |  | $ | (4,891) |  |  | 8
Mortgage backed - residential | 7,993 |  |  | (511) |  |  | — |  |  | — |  |  | 7,993 |  |  | (511) |  |  | 10
Collateralized mortgage obligations | 4,127 |  |  | (275) |  |  | 401 |  |  | (15) |  |  | 4,528 |  |  | (290) |  |  | 5
Total held-to-maturity | $ | 32,273 |  |  | $ | (5,677) |  |  | $ | 401 |  |  | $ | (15) |  |  | $ | 32,674 |  |  | $ | (5,692) |  |  | 23
We do not consider the unrealized losses to be credit-related, as these unrealized losses primarily relate to changes in interest rates and market spreads subsequent to purchase. We do not have plans to sell any of the available-for-sale debt securities with unrealized losses as of December 31, 2023, and we believe it is more likely than not that we would not be required to sell such available-for-sale debt securities before recovery of their amortized cost. We continue to monitor unrealized loss positions for potential credit impairments. During the year ended December 31, 2023, there were no credit impairments related to our investment securities. The amortized cost and fair value of our debt securities by contractual maturity as of December 31, 2023 are summarized in the following table. Maturities are based on the final contractual payment dates and do not reflect the impact of prepayments or earlier redemptions that may occur.
| Amortized Cost |  | Estimated Fair Value
Available-for-sale: |  |  |
Due within 1 year | $ | 23,215 |  |  | $ | 22,802 |
Due after 1 year through 5 years | 55,359 |  |  | 50,882 |
Due after 5 years through 10 years | 152,454 |  |  | 138,464 |
Due after 10 years | 345,827 |  |  | 304,609 |
Total available-for-sale | $ | 576,855 |  |  | $ | 516,757 |
Held-to-maturity: |  |  |
Due after 1 year through 5 years | $ | 988 |  |  | $ | 963 |
Due after 5 years through 10 years | 737 |  |  | 713 |
Due after 10 years | 35,258 |  |  | 30,505 |
Total held-to-maturity | $ | 36,983 |  |  | $ | 32,181 |
Securities with a carrying value of $468,679 and $428,721 were pledged to secure public deposits, securities sold under agreements to repurchase and borrowed funds at December 31, 2023 and 2022, respectively. There were no proceeds from sales and calls of securities for the year ended December 31, 2023. There were proceeds from sales and calls of securities of $81,016 for the year ended December 31, 2022. For the years ended December 31, 2023, 2022 and 2021 there were no gross investment gains or losses resulting from the sale of securities.

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