| Amortized Cost and Fair Values of Investment Securities Available-for-sale |
The following tables present amortized cost and fair values of investment securities available-for-sale as of the periods shown: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | September 30, 2022 | | (Dollars in thousands) | | Amortized Cost | | Unrealized Gain | | Unrealized Loss | | Fair Value | | United States government agency securities | | $ | 52,276 | | | $ | 20 | | | $ | (6,148) | | | $ | 46,148 | | | United States sponsored mortgage-backed securities | | 69,708 | | | — | | | (11,879) | | | 57,829 | | | United States treasury securities | | 121,479 | | | — | | | (10,447) | | | 111,032 | | | Municipal securities | | 156,765 | | | 2,860 | | | (23,867) | | | 135,758 | | | Corporate debt securities | | 7,654 | | | — | | | (14) | | | 7,640 | | | Other debt securities | | 7,500 | | | — | | | — | | | 7,500 | | | Total debt securities | | 415,382 | | | 2,880 | | | (52,355) | | | 365,907 | | | Other securities | | 835 | | | — | | | — | | | 835 | | | Total investment securities available-for-sale | | $ | 416,217 | | | $ | 2,880 | | | $ | (52,355) | | | $ | 366,742 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2021 | | (Dollars in thousands) | | Amortized Cost | | Unrealized Gain | | Unrealized Loss | | Fair Value | | United States government agency securities | | $ | 41,105 | | | $ | 228 | | | $ | (896) | | | $ | 40,437 | | | United States sponsored mortgage-backed securities | | 77,519 | | | 222 | | | (1,633) | | | 76,108 | | | United States treasury securities | | 112,133 | | | — | | | (1,744) | | | 110,389 | | | Municipal securities | | 171,044 | | | 4,334 | | | (366) | | | 175,012 | | | Corporate debt securities | | 11,093 | | | 49 | | | — | | | 11,142 | | | Other debt securities | | 7,500 | | | — | | | — | | | 7,500 | | | Total debt securities | | 420,394 | | | 4,833 | | | (4,639) | | | 420,588 | | | Other securities | | 878 | | | — | | | — | | | 878 | | | Total investment securities available-for-sale | | $ | 421,272 | | | $ | 4,833 | | | $ | (4,639) | | | $ | 421,466 | |
The following table presents amortized cost and fair values of available-for-sale debt securities by contractual maturity as of the period shown: | | | | | | | | | | | | | | | | | September 30, 2022 | | (Dollars in thousands) | | Amortized Cost | | Fair Value | | Within one year | | $ | — | | | $ | — | | | After one year, but within five years | | 133,910 | | | 123,295 | | | After five years, but within ten years | | 40,660 | | | 36,742 | | | After ten years | | 240,812 | | | 205,870 | | | Total | | $ | 415,382 | | | $ | 365,907 | |
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| Investments in an Unrealized Loss Position |
The following tables disclose the length of time that investments have remained in an unrealized loss position at September 30, 2022 and December 31, 2021: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | September 30, 2022 | | (Dollars in thousands) | | Less than 12 months | | 12 months or more | | Description and number of positions | | Fair Value | | Unrealized Loss | | Fair Value | | Unrealized Loss | United States government agency securities (31) | | $ | 22,001 | | | $ | (1,818) | | | $ | 19,638 | | | $ | (4,330) | | United States sponsored mortgage-backed securities (51) | | 15,078 | | | (2,437) | | | 42,750 | | | (9,442) | | United States treasury securities (28) | | 9,507 | | | (95) | | | 101,525 | | | (10,352) | | Municipal securities (214) | | 86,671 | | | (18,089) | | | 23,978 | | | (5,778) | | Corporate debt securities (3) | | 2,386 | | | (14) | | | — | | | — | | | | | | | | | | | | Total | | $ | 135,643 | | | $ | (22,453) | | | $ | 187,891 | | | $ | (29,902) | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2021 | | (Dollars in thousands) | | Less than 12 months | | 12 months or more | | Description and number of positions | | Fair Value | | Unrealized Loss | | Fair Value | | Unrealized Loss | United States government agency securities (21) | | $ | 5,101 | | | $ | (77) | | | $ | 21,770 | | | $ | (819) | | United States sponsored mortgage-backed securities (30) | | 55,354 | | | (1,346) | | | 7,845 | | | (287) | | United States treasury securities (24) | | 110,389 | | | (1,744) | | | — | | | — | | Municipal securities (53) | | 32,221 | | | (270) | | | 7,001 | | | (96) | | | | | | | | | | | | Total | | $ | 203,065 | | | $ | (3,437) | | | $ | 36,616 | | | $ | (1,202) | |
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| Realized Gain (Loss) on Investments |
The following table summarizes investment sales, related gains and losses and unrealized holding gains for the periods shown: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended September 30, | | Nine Months Ended September 30, | | (Dollars in thousands) | | 2022 | | 2021 | | 2022 | | 2021 | | Proceeds from sales of available-for-sale securities | | $ | — | | | $ | 28,049 | | | $ | 60,635 | | | $ | 103,365 | | | Gains, gross | | — | | | 547 | | | 717 | | | 3,411 | | | Losses, gross | | — | | | 18 | | | 67 | | | 31 | | | | | | | | | | | | Proceeds from sales of equity securities | | $ | 161 | | | $ | — | | | $ | 1,261 | | | $ | 61 | | | Gain, gross | | 58 | | | — | | | 158 | | | 5 | | | Losses, gross | | 214 | | | — | | | 214 | | | — | | | | | | | | | | | | Unrealized holding gains (losses) on equity securities | | (61) | | | 536 | | | (146) | | | 1,750 | |
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