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Borrowings - Schedule of short-term borrowings (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
note
Dec. 31, 2022
USD ($)
note
Short-Term Debt [Line Items]    
Total short-term debt $ 615,881,000 $ 351,054,000
Weighted average rate for securities sold under agreements to repurchase 2.44% 1.91%
Weighted average maturity period for securities sold under agreements to repurchase 4 days 5 days
Federal funds purchased $ 0 $ 0
FHLB advances maturing in less than one year from date of origination, and the current portion of long-term FHLB advances due within 12 months    
Short-Term Debt [Line Items]    
Total short-term debt 603,881,000 339,054,000
Term Loan, current portion due within 12 months    
Short-Term Debt [Line Items]    
Total short-term debt $ 12,000,000 $ 12,000,000
Federal Home Loan Bank Certificates and Obligations (FHLB)    
Short-Term Debt [Line Items]    
Number of notes | note 4 4
Weighted average rate for securities sold under agreements to repurchase 4.81% 4.28%
Minimum    
Short-Term Debt [Line Items]    
Short-term borrowings, mature period 1 day  
Maximum    
Short-Term Debt [Line Items]    
Short-term borrowings, mature period 90 days