Employee Benefit Plans - Endorsement Split-Dollar Life Insurance (Details Textual) - USD ($)	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2019
Compensation And Retirement Disclosure [Abstract]
Present value of future proceeds to be received under corporate life insurance policies, liability	$ 100,000	$ 100,000
Aggregate cash surrender value of underlying life insurance, net of policy loans	1,000,000.0	1,000,000.0
Gain (loss) recognized on corporate-owned life insurance policies	$ 31,000	$ 14,000	$ 15,000

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 4
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6812-107765

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_CashSurrenderValueOfLifeInsurance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant