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Basis of Presentation, Description of Business and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2023 | Apr. 01, 2022 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |  |  |  |
Loans, allowance for credit losses | $ 80,398,000 | $ 65,917,000 | $ 47,547,000 |  |  | $ 47,766,000
Deferred tax assets, net | 46,259,000 | 48,355,000 |  |  |  |
Cumulative reduction to retained earnings, net of tax | $ (457,522,000) | $ (357,797,000) |  |  |  |
Contractually Specified Servicing Fee Income, Statement of Income or Comprehensive Income [Extensible Enumeration] | Income from mortgage banking services, net | Income from mortgage banking services, net | Income from mortgage banking services, net |  |  |
Allowance for credit loss on outstanding servicer advances | $ 0 | $ 0 | $ 0 |  |  |
Goodwill impairment loss | 0 | 0 | 0 |  |  |
Impairment of long-lived assets | $ 0 | 720,000 | 0 |  |  |
Defined contribution plan, maximum annual contributions per employee, percent | 100.00% |  |  |  |  |
Defined contribution plan, employer matching contribution, percent of employees' elective deferrals | 100.00% |  |  |  |  |
Defined contribution plan, employer matching contribution, percent of match | 6.00% |  |  |  |  |
Employer discretionary contribution amount | $ 5,300,000 | 5,200,000 | $ 4,900,000 |  |  |
Core Deposits Intangibles |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible asset, useful life | 10 years |  |  |  |  |
Minimum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Mortgage Servicing Rights, base servicing fee as percentage of remaining outstanding principle balances of loans | 0.25% |  |  |  |  |
Promises and equipment, useful lives | 1 year |  |  |  |  |
Minimum | Customer Relationships |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible asset, useful life | 10 years |  |  |  |  |
Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Mortgage Servicing Rights, base servicing fee as percentage of remaining outstanding principle balances of loans | 0.50% |  |  |  |  |
Promises and equipment, useful lives | 39 years |  |  |  |  |
Maximum | Customer Relationships |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-lived intangible asset, useful life | 16 years |  |  |  |  |
Unfunded Loan Commitment |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Loans, allowance for credit losses | $ 2,309,000 | $ 1,313,000 |  |  |  |
Accounting Standards Update 2016-13 | Revision of Prior Period, Adjustment |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Loans, allowance for credit losses |  |  |  | $ 5,300,000 |  |
Deferred tax assets, net |  |  |  | 1,200,000 |  |
Cumulative reduction to retained earnings, net of tax |  |  |  | 3,800,000 |  |
Accounting Standards Update 2016-13 | Revision of Prior Period, Adjustment | Unfunded Loan Commitment |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Loans, allowance for credit losses |  |  |  | $ (200,000) |  |
FirstSun Capital Bancorp and Pioneer Bancshares, Inc. Merger |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Shares issuable in merger (in shares) |  |  |  |  | 1.0443 |

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