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Borrowings - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Oct. 01, 2022
USD ($)
item
Assets Sold under Agreements to Repurchase [Line Items]            
Amount of repurchase agreements $ 21,300   $ 21,300   $ 18,900  
Fair value 612,719   612,719   527,547  
Federal home loan bank, advances, general debt obligations, maximum amount available 1,600,000   1,600,000      
Loans receivable 7,341,221   7,341,221   7,656,688  
Interest expense related to FHLB advances 400 $ 500 2,700 $ 3,800    
Remaining balance on the note 54,743   54,743   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   0  
Asset Pledged as Collateral | Securities Sold under Agreements to Repurchase            
Assets Sold under Agreements to Repurchase [Line Items]            
Fair value $ 28,400   $ 28,400   $ 31,300  
Financing Receivable, Pledging Purpose [Extensible Enumeration] Noninterest-bearing Deposit Liabilities   Noninterest-bearing Deposit Liabilities   Noninterest-bearing Deposit Liabilities  
Excess collateral pledged $ 7,100   $ 7,100   $ 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   Noninterest-bearing Deposit Liabilities  
Fair value of available-for-sale investment securities pledged as collateral $ 0   $ 0   $ 0  
Loans receivable 2,500,000   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 14,900   14,900   14,700  
Interest expense 100 $ 100 400 400    
Fair value adjustment from the acquisition 100   100   300  
Line of credit            
Assets Sold under Agreements to Repurchase [Line Items]            
FHLB advances 0   0   50,000  
Subordinated Debt            
Assets Sold under Agreements to Repurchase [Line Items]            
Debt issuance costs 100   100   200  
Subordinated Debt | Fixed-To-Floating Rate Note, Maturing November 2031            
Assets Sold under Agreements to Repurchase [Line Items]            
Subordinated note 40,000   40,000      
Remaining balance on the note $ 39,900   39,900   $ 39,800  
Interest expense     $ 300 $ 900    
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%