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Borrowings - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Oct. 01, 2022
USD ($)
item
Assets Sold under Agreements to Repurchase [Line Items]        
Amount of repurchase agreements $ 18,900 $ 19,600 $ 20,200  
Fair Value 527,547 628,829    
Remaining balance on the note 54,511 54,200    
Federal home loan bank, advances, general debt obligations, maximum amount available 1,700,000      
Loans receivable 7,656,688 7,600,811    
Interest expense related to FHLB advances 4,600 22,000    
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    
Excess collateral pledged 12,400 10,800 11,800  
Asset Pledged as Collateral | Securities Sold under Agreements to Repurchase        
Assets Sold under Agreements to Repurchase [Line Items]        
Fair Value $ 31,300 $ 30,400 $ 32,000  
Financing Receivable, Pledging Purpose [Extensible Enumeration] Noninterest-bearing Deposit Liabilities Noninterest-bearing Deposit Liabilities Noninterest-bearing Deposit Liabilities  
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 $ 0  
Loans receivable 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
Fair value adjustment from the acquisition 300 500    
Remaining balance on the note 14,700 14,500    
Interest expense 600 600    
Line of credit        
Assets Sold under Agreements to Repurchase [Line Items]        
FHLB advances 50,000 340,000    
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 39,700    
Debt issuance costs 200 300    
Interest expense $ 1,200 1,200    
Interest rate (as a percent) 3.00%      
Variable rate basis (as a percent) 2.03%      
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) 3.06%      
Redemption price as a percent of principal 100.00%      
Maturity on Demand        
Assets Sold under Agreements to Repurchase [Line Items]        
Amount of repurchase agreements $ 0 $ 0 $ 0