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Goodwill and Intangible Assets - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) item | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) item | Dec. 31, 2023 USD ($)
Goodwill and Intangible Assets |  |  |  |  |
Goodwill acquired | $ 306,043 |  | $ 306,043 |  | $ 306,043
Goodwill Impairment |  |  | $ 0 |  | 0
Amortization period for acquired intangible assets |  |  | 9 years 9 months 18 days |  |
Mortgage loans serviced |  |  | $ 500,000 | $ 500,000 |
Mortgage service fees | 300 | $ 600 | 1,100 | 1,900 |
Loans | 7,619,448 |  | 7,619,448 |  | 7,600,811
Amortization expense | $ 1,977 | 2,008 | $ 5,962 | 5,378 |
Core deposit intangible |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |
Amortization period | 10 years |  | 10 years |  |
Other intangible assets |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |
Amortization expense | $ 2,000 | $ 2,000 | $ 6,000 | 5,400 |
MSRs |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |
Amortization expense |  |  | $ 356 | $ 675 |
MSRs | Discount rate | Minimum |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |
Servicing assets measurement input (as a percent) | 0.100 | 0.100 | 0.100 | 0.100 |
MSRs | Discount rate | Maximum |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |
Servicing assets measurement input (as a percent) | 0.105 | 0.105 | 0.105 | 0.105 |
MSRs | Constant prepayment speed | Minimum |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |
Servicing assets measurement input (as a percent) | 0.069 | 0.060 | 0.069 | 0.060 |
MSRs | Constant prepayment speed | Maximum |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |
Servicing assets measurement input (as a percent) | 0.176 | 0.106 | 0.176 | 0.106 |
Small Business Administration ("SBA") servicing rights |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |
Fee income | $ 100 | $ 100 | $ 200 | $ 700 |
Loans | $ 129,700 |  | 129,700 |  | $ 108,800
Amortization expense |  |  | $ 177 | $ 104 |
Small Business Administration ("SBA") servicing rights | Discount rate |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |
Servicing assets measurement input (as a percent) | 0.097 | 0.137 | 0.097 | 0.137 |
Small Business Administration ("SBA") servicing rights | Constant prepayment speed |  |  |  |  |
Goodwill and Intangible Assets |  |  |  |  |
Servicing assets measurement input (as a percent) | 0.156 | 0.141 | 0.156 | 0.141 |
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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