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Basis of Presentation, Description of Business and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 01, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2022
Business Acquisition [Line Items] |  |  |  |  |
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 |
Goodwill impairment loss |  | $ 0 | $ 0 | $ 0 |
Impairment of long-lived assets |  | $ 720,000 | 0 | 678,000 |
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 |  | $ 5,200,000 | 4,900,000 | $ 4,400,000 |
Right-of-use assets |  | 28,404,000 | $ 0 |  |
Lease liability |  | $ 31,267,000 |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Right-of-use assets |  |  |  |  | $ 35,200,000
Lease liability |  |  |  |  | $ 38,500,000
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 |  | 3 years |  |  |
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 |  |  |
FirstSun Capital Bancorp and Pioneer Bancshares, Inc. Merger |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Shares issuable in merger (in shares) | 1.0443 |  |  |  |

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