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INVESTMENT SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Amortized Cost and Fair Values of Investment Securities Available-for-sale | Amortized cost and fair values of investment securities available-for-sale at December 31, 2021 are summarized as follows:
(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 |
Amortized cost and fair values of investment securities available-for-sale at December 31, 2020 are summarized as follows:
(Dollars in thousands) |  | Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Fair Value
United States government agency securities |  | $ | 53,207 |  |  | $ | 872 |  |  | $ | (210) |  |  | $ | 53,869 |
United States sponsored mortgage-backed securities |  | 94,968 |  |  | 972 |  |  | (171) |  |  | 95,769 |
United States treasury securities |  | 3,000 |  |  | 123 |  |  | — |  |  | 3,123 |
Municipal securities |  | 223,642 |  |  | 8,327 |  |  | (82) |  |  | 231,887 |
Corporate debt securities |  | 17,473 |  |  | 146 |  |  | (71) |  |  | 17,548 |
Other debt securities |  | 7,500 |  |  | — |  |  | — |  |  | 7,500 |
Total debt securities |  | 399,790 |  |  | 10,440 |  |  | (534) |  |  | 409,696 |
Other securities |  | 928 |  |  | — |  |  | — |  |  | 928 |
Total investment securities available-for-sale |  | $ | 400,718 |  |  | $ | 10,440 |  |  | $ | (534) |  |  | $ | 410,624 |
The following table summarizes amortized cost and fair values of debt securities by maturity:
|  | December 31, 2021
|  | Available for sale
(Dollars in thousands) |  | Amortized Cost |  | Fair Value
Within one year |  | $ | 994 |  |  | $ | 1,006 |
After one year, but within five years |  | 120,932 |  |  | 119,219 |
After five years, but within ten years |  | 33,898 |  |  | 34,495 |
After ten years |  | 264,570 |  |  | 265,868 |
Total |  | $ | 420,394 |  |  | $ | 420,588 |
Investments in an Unrealized Loss Position | The following table discloses the length of time that investments have remained in an unrealized loss position at 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) |
|  | $ | 203,065 |  |  | $ | (3,437) |  |  | $ | 36,616 |  |  | $ | (1,202) |
The following table discloses the length of time that investments have remained in an unrealized loss position at December 31, 2020:
(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 (27) |  | $ | 19,021 |  |  | $ | (68) |  |  | $ | 12,574 |  |  | $ | (142) |
United States sponsored mortgage-backed securities (9) |  | 15,331 |  |  | (155) |  |  | 3,349 |  |  | (16) |
Municipal securities (14) |  | 11,856 |  |  | (82) |  |  | — |  |  | — |
Corporate debt securities (5) |  | 3,947 |  |  | (71) |  |  | — |  |  | — |
|  | $ | 50,155 |  |  | $ | (376) |  |  | $ | 15,923 |  |  | $ | (158) |
Realized Gain (Loss) on Investments | The following table summarizes the investment sales and related gains and losses in 2021, 2020 and 2019:
(Dollars in thousands) |  | 2021 |  | 2020 |  | 2019
Sales of available-for-sale investments |  | $ | 146,011 |  |  | $ | 54,023 |  |  | $ | 31,220 |
Gross gains |  | 3,944 |  |  | 948 |  |  | 105 |
Gross losses |  | 69 |  |  | 34 |  |  | 271 |
Sales of equity investments |  | $ | 543 |  |  | $ | 4,622 |  |  | $ | 5,968 |
Gross gains |  | 5 |  |  | 3,501 |  |  | — |
Gross losses |  | — |  |  | — |  |  | 7 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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