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Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Mar. 31, 2022
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill, net | $ 196,461 |  |  | $ 140,412 |
Principal balance of mortgage loans serviced for others | $ 641,200 |  |  | $ 73,600 |
Weighted average amortization period of intangibles | 3 years 9 months 10 days |  |  |  |
Core Deposit Intangibles |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted average amortization period of intangibles | 3 years 6 months 3 days |  |  |  |
Customer List Intangibles |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted average amortization period of intangibles | 4 years 6 months 21 days |  |  |  |
Blackhawk Bancorp, Inc |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill, net | $ 50,097 | $ 50,100 |  |  |
Purdum, Gray, Ingledue, Beck, Inc. |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill, net | 5,951 |  | $ 6,000 |  |
Delta Bancshares Company |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill, net | $ 28,558 |  |  |  | $ 28,600

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