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Goodwill and Intangible Assets - Narrative (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 03, 2023 USD ($) | Sep. 30, 2023 USD ($) item | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) item | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Sep. 01, 2022
Goodwill and Intangible Assets |  |  |  |  |  |  |
Goodwill acquired |  | $ 306,043,000 |  | $ 306,043,000 |  | $ 279,132,000 |
Goodwill Impairment |  |  |  | $ 0 |  | 0 |
Amortization period for acquired intangible assets |  |  |  | 9 years 9 months 18 days |  |  |
Mortgage loans serviced |  |  |  | $ 500,000,000 | $ 1,000,000,000.0 |  |
Mortgage service fees |  | 600,000 | $ 700,000 | 1,900,000 | 1,800,000 |  |
Loans |  | 7,384,992,000 |  | 7,384,992,000 |  | $ 7,130,916,000 |
Amortization expense |  | $ 2,008,000 | 383,000 | $ 5,378,000 | 975,000 |  |
Cambr Solutions, LLC ("Cambr") |  |  |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |  |  |
Goodwill acquired | $ 26,911,000 |  |  |  |  |  |
Acquired through acquisition | 18,000,000.0 |  |  |  |  |  |
Core deposit intangible |  |  |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |  |  |
Amortization period |  | 10 years |  | 10 years |  |  | 10 years
Core deposit intangible | Cambr Solutions, LLC ("Cambr") |  |  |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |  |  |
Acquired through acquisition | 1,700,000,000 |  |  |  |  |  |
Other intangible assets |  |  |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |  |  |
Amortization expense |  | $ 2,000,000.0 | $ 400,000 | $ 5,400,000 | 1,000,000.0 |  |
Other intangible assets | Cambr Solutions, LLC ("Cambr") |  |  |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |  |  |
Acquired through acquisition | $ 18,000,000.0 |  |  |  |  |  |
Amortization period for acquired intangible assets | 9 years 4 months 24 days |  |  |  |  |  |
MSRs |  |  |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |  |  |
Amortization expense |  |  |  | $ 675,000 | $ 713,000 |  |
MSRs | Discount Rate | Minimum |  |  |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |  |  |
Servicing assets measurement input (as a percent) |  | 0.100 | 0.095 | 0.100 | 0.095 |  |
MSRs | Discount Rate | Maximum |  |  |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |  |  |
Servicing assets measurement input (as a percent) | item |  | 0.105 |  | 0.105 |  |  |
MSRs | Constant Prepayment Speed | Minimum |  |  |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |  |  |
Servicing assets measurement input (as a percent) |  | 0.060 | 0.076 | 0.060 | 0.076 |  |
MSRs | Constant Prepayment Speed | Maximum |  |  |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |  |  |
Servicing assets measurement input (as a percent) |  | 0.106 | 0.078 | 0.106 | 0.078 |  |
Small Business Administration ("SBA") servicing rights |  |  |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |  |  |
Fee income |  | $ 100,000 |  | $ 700,000 |  |  |
Loans |  | $ 108,200,000 |  | 108,200,000 |  |  |
Amortization expense |  |  |  | $ 104,000 |  |  |
Small Business Administration ("SBA") servicing rights | Discount Rate |  |  |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |  |  |
Servicing assets measurement input (as a percent) |  | 0.1374 |  | 0.1374 |  |  |
Small Business Administration ("SBA") servicing rights | Constant Prepayment Speed |  |  |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |  |  |
Servicing assets measurement input (as a percent) |  | 0.1408 |  | 0.1408 |  |  |
Customer relationship intangible |  |  |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |  |  |
Amortization period |  | 10 years |  | 10 years |  |  |
Internally developed technology |  |  |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |  |  |
Amortization period |  | 5 years |  | 5 years |  |  |

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