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Allowance for Credit Losses - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Allowance For Loan And Lease Losses [Line Items]      
Charge-offs, net $ 1,100 $ 1,800  
Increase in allowance for credit losses 8,400 39,900  
Provision for credit loss expense (release) 8,295 36,729 $ (9,293)
Accrued interest receivable $ 42,400 31,800  
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Financing Receivable, Allowance for Credit Losses    
Rock Canyon Bank And Bank Of Jackson Hole      
Allowance For Loan And Lease Losses [Line Items]      
Provision expense (release) for credit losses   21,200  
Provision for credit loss expense (release)   $ 6,200