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Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2022

Non-contributory defined benefit pension plan

Retirement Plans

Schedule of expenses incurred and charged against operations with regard to all of the company's retirement plans

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​	​	​	​	​	​	​	​	​	​	​
​	​	Year Ended December 31,
(Dollars in thousands)	​	2022		​	2021		​	2020
Employee savings plan/ 401(k)	​	$	15,357	​	$	14,991	​	$	10,962	​
Supplemental executive retirement plan	​		(1,510)	​		3,475	​		2,862	​
Post-retirement benefits	​		(108)	​		67	​		43	​
​	​	$	13,739	​	$	18,533	​	$	13,867	​

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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