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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of 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, 2023 are summarized as follows:
(Dollars in thousands)Amortized CostUnrealized GainUnrealized LossFair Value
United States government agency securities$44,003 $8 $(5,603)$38,408 
United States sponsored mortgage-backed securities91,939 992 (10,549)82,382 
United States treasury securities106,401 — (6,045)100,356 
Municipal securities118,065 — (11,158)106,907 
Corporate debt securities9,076 — (134)8,942 
Other debt securities7,500 — — 7,500 
Total debt securities376,984 1,000 (33,489)344,495 
Other securities780 — — 780 
Total investment securities available-for-sale$377,764 $1,000 $(33,489)$345,275 

Amortized cost and fair values of investment securities available-for-sale at December 31, 2022 are summarized as follows:
(Dollars in thousands)Amortized CostUnrealized GainUnrealized LossFair Value
United States government agency securities$51,436 $15 $(6,637)$44,814 
United States sponsored mortgage-backed securities68,267 — (11,696)56,571 
United States treasury securities130,689 48 (9,828)120,909 
Municipal securities157,842 2,412 (21,618)138,636 
Corporate debt securities10,570 10 (20)10,560 
Other debt securities7,500 — — 7,500 
Total debt securities426,304 2,485 (49,799)378,990 
Other securities824 — — 824 
Total investment securities available-for-sale$427,128 $2,485 $(49,799)$379,814 
The following table summarizes amortized cost and fair values of debt securities by maturity:
December 31, 2023
Available for sale
(Dollars in thousands)Amortized CostFair Value
Within one year$4,785 $4,783 
After one year, but within five years112,009 105,897 
After five years, but within ten years41,860 37,866 
After ten years218,330 195,949 
Total$376,984 $344,495 
Schedule of Investments in an Unrealized Loss Position
The following tables show available-for-sale debt securities in an unrealized loss position for which an ACL has not been recorded as of December 31, 2023 and December 31, 2022, aggregated by investment category and length of time that the individual securities have been in a continuous loss position:

(Dollars in thousands)Less than 12 months12 months or more
Description and number of positionsFair ValueUnrealized LossFair ValueUnrealized Loss
United States government agency securities (25)
$316 $— $34,619 $(5,603)
United States sponsored mortgage-backed securities (47)
— — 50,345 (10,549)
United States treasury securities (23)
— — 100,354 (6,045)
Municipal securities (216)
847 (10)106,060 (11,148)
Corporate debt securities (7)
2,009 (67)1,933 (67)
$3,172 $(77)$293,311 $(33,412)

(Dollars in thousands)Less than 12 months12 months or more
Description and number of positionsFair ValueUnrealized LossFair ValueUnrealized Loss
United States government agency securities (32)
$21,287 $(1,937)$19,423 $(4,700)
United States sponsored mortgage-backed securities (51)
6,953 (852)49,618 (10,844)
United States treasury securities (29)
11,936 (130)102,092 (9,698)
Municipal securities (173)
65,930 (7,507)41,184 (14,111)
Corporate securities (3)
2,380 (20)— — 
$108,486 $(10,446)$212,317 $(39,353)
Schedule of Realized Gain (Loss) on Investments
The following table summarizes the investment sales and related gains and losses in 2023, 2022 and 2021:
(Dollars in thousands)202320222021
Proceeds from sales of available-for-sale securities$54,531 $60,635 $146,011 
Gains, gross— 717 3,944 
Losses, gross(1,536)(67)(69)
Proceeds from sales of equity securities$566 $1,356 $543 
Gains, gross25 158 5 
Losses, gross(294)(214)— 
Unrealized holding gains (losses) on equity securities$146 $(1,543)$3,776