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Borrowings - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Oct. 01, 2022
USD ($)
item
Dec. 31, 2021
USD ($)
Assets Sold under Agreements to Repurchase [Line Items]        
Amount of repurchase agreements $ 19,600 $ 20,200   $ 22,800
Fair Value 628,829 706,289    
Remaining balance on the note 54,200 53,890    
Federal home loan bank, advances, general debt obligations, maximum amount available 1,700,000      
Loans receivable 7,600,811 7,130,916    
Interest expense related to FHLB advances 22,000 1,700    
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 10,800 11,800   6,100
Asset Pledged as Collateral | Securities Sold under Agreements to Repurchase [Member]        
Assets Sold under Agreements to Repurchase [Line Items]        
Fair Value $ 30,400 $ 32,000   $ 28,800
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 [Member]        
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 2,600,000 2,000,000   1,300,000
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 500      
Remaining balance on the note 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 600 200    
Line of credit [Member]        
Assets Sold under Agreements to Repurchase [Line Items]        
FHLB advances 340,000 385,000   0
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      
Debt issuance costs $ 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 $ 1,200 1,200    
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%      
Maturity on Demand [Member]        
Assets Sold under Agreements to Repurchase [Line Items]        
Amount of repurchase agreements $ 0 $ 0   $ 0