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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

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