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Borrowings - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Oct. 01, 2022
USD ($)
item
Assets Sold under Agreements to Repurchase [Line Items]            
Amount of repurchase agreements $ 20,300   $ 20,300   $ 20,200  
Fair Value 620,445   620,445   706,289  
Remaining balance on the note 54,123   54,123   53,890  
Debt issuance costs 300   300      
Federal home loan bank, advances, general debt obligations, maximum amount available 1,700,000   1,700,000      
Loans receivable 7,384,992   7,384,992   7,130,916  
Interest expense related to FHLB advances 4,400 $ 0 17,100 $ 0    
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 [Member]            
Assets Sold under Agreements to Repurchase [Line Items]            
Fair Value $ 29,900   $ 29,900   $ 32,000  
Financing Receivable, Pledging Purpose [Extensible Enumeration] Noninterest-bearing Deposit Liabilities   Noninterest-bearing Deposit Liabilities   Noninterest-bearing Deposit Liabilities  
Excess collateral pledged $ 9,600   $ 9,600   $ 11,800  
Asset Pledged as Collateral | Federal Home Loan Bank Advances [Member]            
Assets Sold under Agreements to Repurchase [Line Items]            
Fair Value $ 0   $ 0   0  
Financing Receivable, Pledging Purpose [Extensible Enumeration] Noninterest-bearing Deposit Liabilities   Noninterest-bearing Deposit Liabilities      
Loans receivable $ 2,500,000   $ 2,500,000   2,000,000  
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 39,700   39,700      
Fixed-To-Floating Rate Note, Maturing November 2031 | Other liabilities            
Assets Sold under Agreements to Repurchase [Line Items]            
Interest expense 300   900      
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   500      
Remaining balance on the note 14,500   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   400      
Line of credit [Member]            
Assets Sold under Agreements to Repurchase [Line Items]            
FHLB advances $ 316,800   $ 316,800   $ 385,000  
Subordinated Debt [Member] | Fixed-To-Floating Rate Note, Maturing November 2031            
Assets Sold under Agreements to Repurchase [Line Items]            
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 [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)     306.00%      
Redemption price as a percent of principal     100.00%