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Borrowings - Narrative (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Oct. 01, 2022
USD ($)
item
Assets Sold under Agreements to Repurchase [Line Items]        
Amount of repurchase agreements $ 20,700   $ 18,900  
Fair value 634,376   527,547  
Federal home loan bank, advances, general debt obligations, maximum amount available 1,700,000      
Loans receivable 7,556,104   7,656,688  
Interest expense related to FHLB advances 1,100 $ 3,200    
Remaining balance on the note 54,588   54,511  
Bank of Jackson Hole        
Assets Sold under Agreements to Repurchase [Line Items]        
Number of subordinated note purchase agreements assumed | item       3
Asset Pledged as Collateral        
Assets Sold under Agreements to Repurchase [Line Items]        
Fair value 0   0  
Asset Pledged as Collateral | Securities Sold under Agreements to Repurchase        
Assets Sold under Agreements to Repurchase [Line Items]        
Fair value $ 31,400   $ 31,300  
Financing Receivable, Pledging Purpose [Extensible Enumeration] Noninterest-bearing Deposit Liabilities   Noninterest-bearing Deposit Liabilities  
Excess collateral pledged $ 10,600   $ 12,400  
Asset Pledged as Collateral | Federal Home Loan Bank Advances        
Assets Sold under Agreements to Repurchase [Line Items]        
Financing Receivable, Pledging Purpose [Extensible Enumeration] Noninterest-bearing Deposit Liabilities   Noninterest-bearing Deposit Liabilities  
Fair value of available-for-sale investment securities pledged as collateral $ 0   $ 0  
Loans receivable 2,500,000   2,600,000  
Fixed-To-Floating Rate Note, Maturing June 2031 | Bank of Jackson Hole        
Assets Sold under Agreements to Repurchase [Line Items]        
Subordinated note       $ 15,000
Remaining balance on the note     14,700  
Interest expense 100 100    
Fair value adjustment from the acquisition 300      
Line of credit        
Assets Sold under Agreements to Repurchase [Line Items]        
FHLB advances 80,000   50,000  
Subordinated Debt        
Assets Sold under Agreements to Repurchase [Line Items]        
Debt issuance costs 200   200  
Subordinated Debt | Fixed-To-Floating Rate Note, Maturing November 2031        
Assets Sold under Agreements to Repurchase [Line Items]        
Subordinated note 40,000      
Remaining balance on the note 39,800   $ 39,800  
Interest expense $ 300 $ 300    
Interest rate (as a percent) 3.00%      
Variable rate basis (as a percent) 203.00%      
Redemption price as a percent of principal 100.00%      
Subordinated Debt | Fixed-To-Floating Rate Note, Maturing June 2031 | Bank of Jackson Hole        
Assets Sold under Agreements to Repurchase [Line Items]        
Interest rate (as a percent) 3.75%      
Variable rate basis (as a percent) 306.00%      
Redemption price as a percent of principal 100.00%