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INVESTMENT SECURITIES (Tables)
12 Months Ended
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 CostUnrealized GainUnrealized LossFair Value
United States government agency securities$41,105 $228 $(896)$40,437 
United States sponsored mortgage-backed securities77,519 222 (1,633)76,108 
United States treasury securities112,133 — (1,744)110,389 
Municipal securities171,044 4,334 (366)175,012 
Corporate debt securities11,093 49 — 11,142 
Other debt securities7,500 — — 7,500 
Total debt securities420,394 4,833 (4,639)420,588 
Other securities878 — — 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 CostUnrealized GainUnrealized LossFair Value
United States government agency securities$53,207 $872 $(210)$53,869 
United States sponsored mortgage-backed securities94,968 972 (171)95,769 
United States treasury securities3,000 123 — 3,123 
Municipal securities223,642 8,327 (82)231,887 
Corporate debt securities17,473 146 (71)17,548 
Other debt securities7,500 — — 7,500 
Total debt securities399,790 10,440 (534)409,696 
Other securities928 — — 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 CostFair Value
Within one year$994 $1,006 
After one year, but within five years120,932 119,219 
After five years, but within ten years33,898 34,495 
After ten years264,570 265,868 
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 months12 months or more
Description and number of positionsFair ValueUnrealized LossFair ValueUnrealized 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 months12 months or more
Description and number of positionsFair ValueUnrealized LossFair ValueUnrealized 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)202120202019
Sales of available-for-sale investments$146,011 $54,023 $31,220 
Gross gains3,944 948 105 
Gross losses69 34 271 
Sales of equity investments$543 $4,622 $5,968 
Gross gains3,501 — 
Gross losses— —