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Borrowings - Narrative (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Oct. 01, 2022
USD ($)
item
Assets Sold under Agreements to Repurchase [Line Items]        
Amount of repurchase agreements $ 19,600   $ 19,600  
Fair Value 685,666   628,829  
Remaining balance on the note 54,278   54,200  
Federal home loan bank, advances, general debt obligations, maximum amount available 1,800,000      
Loans receivable 7,471,445   7,600,811  
Interest expense related to FHLB advances 3,200 $ 7,100    
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 | Securities Sold under Agreements to Repurchase [Member]        
Assets Sold under Agreements to Repurchase [Line Items]        
Fair Value $ 30,100   $ 30,400  
Financing Receivable, Pledging Purpose [Extensible Enumeration] Noninterest-bearing Deposit Liabilities   Noninterest-bearing Deposit Liabilities  
Excess collateral pledged $ 10,400   $ 10,800  
Asset Pledged as Collateral | Federal Home Loan Bank Advances [Member]        
Assets Sold under Agreements to Repurchase [Line Items]        
Fair Value $ 0   $ 0  
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
Fair value adjustment from the acquisition 400   500  
Remaining balance on the note 14,600   14,500  
Fixed-To-Floating Rate Note, Maturing June 2031 | Other liabilities | Bank of Jackson Hole        
Assets Sold under Agreements to Repurchase [Line Items]        
Interest expense 100 100    
Line of credit [Member]        
Assets Sold under Agreements to Repurchase [Line Items]        
FHLB advances 0   340,000  
Subordinated Debt [Member] | 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 39,700   39,700  
Debt issuance costs $ 300   $ 300  
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 [Member] | Fixed-To-Floating Rate Note, Maturing November 2031 | Other liabilities        
Assets Sold under Agreements to Repurchase [Line Items]        
Interest expense $ 300 $ 300    
Subordinated Debt [Member] | 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%