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Investments - Schedule of allowance for credit losses on investment securities (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2023	Mar. 31, 2023	Mar. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	$ 15,319	$ 15,319	$ 12,935
Provision for credit losses	0
Charge-offs		(119)	(46)
Recoveries		91	26
Ending balance		17,869	$ 13,017
Allowance for credit losses | Government Sector [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	0	0
Adjustment for the adoption of ASU 2016-13		0
Provision for credit losses		0
Allowance on purchased financial assets with credit deterioration		0
Charge-offs		0
Recoveries		0
Ending balance		0
Allowance for credit losses | Financial Services Sector [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	0	0
Adjustment for the adoption of ASU 2016-13		40
Provision for credit losses		0
Allowance on purchased financial assets with credit deterioration		0
Charge-offs		0
Recoveries		0
Ending balance		40
Allowance for credit losses | Securities issued by state and political subdivision
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	0	0
Adjustment for the adoption of ASU 2016-13		1
Provision for credit losses		0
Allowance on purchased financial assets with credit deterioration		0
Charge-offs		0
Recoveries		0
Ending balance		1
Allowance for credit losses | Corporate Securities [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	$ 0	0
Adjustment for the adoption of ASU 2016-13		409
Provision for credit losses		0
Allowance on purchased financial assets with credit deterioration		0
Charge-offs		0
Recoveries		0
Ending balance		$ 409

X

- Definition

Amount of increase in allowance for credit loss on financing receivable from purchase of loan. Excludes financing receivable purchased with credit deterioration, loan acquired through business combination or acquisition, and net investment in lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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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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Amount of increase (decrease) in allowance for credit loss on financing receivable.

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Amount of increase in allowance for credit loss on financing receivable from recovery.

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- Definition

Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amount of expense related to credit loss from transactions other than loan and lease transactions.

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