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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of 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, 2024
(Dollars in thousands)Amortized CostUnrealized GainUnrealized LossFair Value
United States government agency securities$45,715 $107 $(4,185)$41,637 
United States sponsored mortgage-backed securities115,279 946 (8,947)107,278 
United States treasury securities106,172 — (2,931)103,241 
Municipal securities115,593 238 (9,859)105,972 
Corporate debt securities8,583 15 (147)8,451 
Other debt securities7,500 — — 7,500 
Total available-for-sale debt securities398,842 1,306 (26,069)374,079 
Other securities749 — — 749 
Investment securities available-for-sale$399,591 $1,306 $(26,069)$374,828 
December 31, 2023
(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 available-for-sale debt securities376,984 1,000 (33,489)344,495 
Other securities780 — — 780 
Investment securities available-for-sale$377,764 $1,000 $(33,489)$345,275 

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, 2024
(Dollars in thousands)Amortized CostFair Value
Within one year$75,818 $74,094 
After one year, but within five years42,555 40,812 
After five years, but within ten years42,135 39,043 
After ten years238,334 220,130 
Total available-for-sale debt securities$398,842 $374,079 
Schedule of Allowance for credit Loss, Available-For-Sale Debt Securities
The following table summarizes the activity in the ACL related to available-for-sale debt securities during the three and nine months ended September 30, 2024. There was no activity in the ACL related to available-for-sale debt securities during the three and nine months ended September 30, 2023.
(Dollars in thousands)Three Months Ended September 30, 2024Nine Months Ended September 30, 2024
ACL, beginning of period$— $— 
Provision for credit losses500 500 
Charge-offs(500)(500)
ACL, end of period$— $— 
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 September 30, 2024 and December 31, 2023, aggregated by investment category and length of time that the individual securities have been in a continuous loss position:
September 30, 2024
(Dollars in thousands)Less than 12 months12 months or more
Description and number of positionsFair ValueUnrealized LossFair ValueUnrealized Loss
United States government agency securities (23)
$302 $(1)$34,215 $(4,184)
United States sponsored mortgage-backed securities (48)
4,842 (78)48,286 (8,869)
United States treasury securities (23)
— — 103,241 (2,931)
Municipal securities (191)
8,711 (827)86,256 (9,032)
Corporate debt securities (6)
— — 3,436 (147)
Total$13,855 $(906)$275,434 $(25,163)
December 31, 2023
(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)
Total$3,172 $(77)$293,311 $(33,412)
Schedule of Realized Gain (Loss) on Investments
The following table summarizes investment sales, related gains and losses and unrealized holding losses for the periods shown:
Three Months Ended September 30,Nine Months Ended September 30,
(Dollars in thousands)2024202320242023
Proceeds from sales of available-for-sale securities$— $— $24,327 $54,531 
Gains, gross— — 658 — 
Losses, gross— — — 1,536 
Proceeds from sales of equity securities$— $360 $39 $566 
Gain, gross— 25 103 25 
Losses, gross— — — 294 
Unrealized holding gains (losses) on equity securities$498 $219 $463 $71