Investment Securities Available for Sale (Tables)

12 Months Ended

Dec. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Carrying Amount and Fair Values of Investment Securities Available For Sale

The carrying amount of securities and their approximate fair values as of December 31, 2022 and 2021 are as follows:

	December 31, 2022
(Dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized  Losses		Estimated Fair Value
Securities available-for-sale:
State and municipal securities	$	422	$	—	$	5	$	417
Mortgage-backed securities and other agency obligations		23,522		238		879		22,881
U.S. Treasury bonds		100,567		—		2,049		98,518
Corporate bonds		57,607		59		3,415		54,251
	$	182,118	$	297	$	6,348	$	176,067

	December 31, 2021
(Dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized  Losses		Estimated Fair Value
Securities Available-for-sale:
State and municipal securities	$	1,087	$	7	$	—	$	1,094
Mortgage-backed securities and other agency obligations		791		20		—		811
U.S. Treasury bonds		—		—		—		—
Corporate bonds		23,556		972		1		24,527
	$	25,434	$	999	$	1	$	26,432

Schedule of Amortized Cost and Fair Value of Securities by Contractual Maturity

The amortized cost and estimated fair value of securities available for sale at December 31, 2022, by contractual maturity, are shown below.

	December 31, 2022
	Securities Available for Sale
(Dollars in thousands)	Amortized Cost		Estimated Fair Value
Due in one year or less	$	100,990	$	98,935
Due from one year to five years		3,778		3,838
Due from five to ten years		53,828		50,413
		158,596		153,186
Mortgage-backed securities and other agency obligations		23,522		22,881
	$	182,118	$	176,067

Summary of Securities with Unrealized Losses

The following table summarizes securities with unrealized losses at December 31, 2022 and 2021, aggregated by major security type and length of time in a continuous unrealized loss position:

	December 31, 2022
(Dollars in thousands)	Less Than 12 Months in a Loss Position		Greater Than 12 Months in a  Loss Position		Total Unrealized Loss		Estimated Fair Value
Securities available-for-sale:
State and municipal securities	$	5	$	—	$	5	$	417
Mortgage-backed securities and other agency obligations		879		—		879		18,376
U.S. Treasury bonds		2,049		—		2,049		98,518
Corporate bonds		3,415		—		3,415		50,413
	$	6,348	$	—	$	6,348	$	167,724
	December 31, 2021
(Dollars in thousands)	Less Than 12 Months in a Loss Position		Greater Than 12 Months in a  Loss Position		Total Unrealized Loss		Estimated Fair Value
Securities available-for-sale:
State and municipal securities	$	—	$	—	$	—	$	—
Mortgage-backed securities and other agency obligations		—		—		—		—
U.S. Treasury bonds		—		—		—		—
Corporate bonds		—		1		1		3,999
	$	—	$	1	$	1	$	3,999