Net periodic benefit cost and other amounts recognized in other comprehensive income included the following components:


(Dollar amounts in thousands)	2023		2022		2021
Service cost - benefits earned	$	628	$	1,190	$	1,355
Interest cost on projected benefit obligation		3,824		2,826		2,632
Expected return on plan assets		(3,879)		(4,910)		(4,713)
Net amortization and deferral		752		1,259		2,072
Net periodic pension cost		1,325		365		1,346
Net loss (gain) during the period		(1,761)		(5,323)		(5,883)
Amortization of prior service cost		—		—		(1)
Amortization of unrecognized (gain) loss		(752)		(1,259)		(2,072)
Total recognized in other comprehensive (income) loss		(2,513)		(6,582)		(7,956)
Total recognized net periodic pension cost and other comprehensive income	$	(1,188)	$	(6,217)	$	(6,610)


	Balance at		Current Period		Balance at
(Dollar amounts in thousands)	1/1/2023		Change		12/31/2023
Unrealized gains (losses) on securities available-for-sale without other than temporary impairment	$	(131,135)	$	10,883	$	(120,252)
Unrealized gains (losses) on securities available-for-sale with other than temporary impairment		2,239		13		2,252
Total unrealized gain (loss) on securities available-for-sale	$	(128,896)	$	10,896	$	(118,000)
Unrealized gain (loss) on retirement plans		(11,078)		1,991		(9,087)
TOTAL	$	(139,974)	$	12,887	$	(127,087)


	Balance at		Current Period		Balance at
(Dollar amounts in thousands)	1/1/2022		Change		12/31/2022
Unrealized gains (losses) on securities available-for-sale without other than temporary impairment	$	13,155	$	(144,290)	$	(131,135)
Unrealized gains (losses) on securities available-for-sale with other than temporary impairment		2,519		(280)		2,239
Total unrealized income (loss) on securities available-for-sale	$	15,674	$	(144,570)	$	(128,896)
Unrealized gain (loss) on retirement plans		(18,100)		7,022		(11,078)
TOTAL	$	(2,426)	$	(137,548)	$	(139,974)

Estimated Future Payments — The following benefit payments, which reflect expected future service, are expected:

Estimated Future Payments — The following benefit payments, which reflect expected future service, are expected:

Amounts recognized in accumulated other comprehensive income at December 31, 2023 and 2022 consist of:

Post-retirement health benefit expense included the following components:


	Years Ended December 31,
(Dollar amounts in thousands)	2023		2022		2021
Service cost	$	21	$	34	$	43
Interest cost		153		111		103
Amortization of net actuarial loss (gain)		(53)		—		—
Net periodic benefit cost		121		145		146
Net loss (gain) during the period		34		(758)		(53)
Amortization of prior service cost		53		—		—
Total recognized in other comprehensive income (loss)		87		(758)		(53)
Total recognized net periodic benefit cost and other comprehensive income	$	208	$	(613)	$	93

Estimated Future Payments — The following benefit payments, which reflect expected future service, are expected: