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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