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Goodwill and Intangible Assets - Schedule of Reconciliation of Purchase Price Paid for Acquisition and Goodwill Recorded (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Less purchase accounting adjustments: |  |  |  |  |
Resulting goodwill from acquisition |  |  |  | $ 203,391 | $ 196,461
Mid Rivers |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Unallocated purchase price | $ 10,059 |  |  |  |
Less purchase accounting adjustments: |  |  |  |  |
Insurance Company intangible | 4,305 |  |  |  |
Other liabilities | (1,176) |  |  |  |
Goodwill, purchase accounting adjustments | 3,129 |  |  |  |
Resulting goodwill from acquisition | $ 6,930 |  |  |  |
Blackhawk Bancorp, Inc |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Unallocated purchase price |  | $ 26,955 |  |  |
Less purchase accounting adjustments: |  |  |  |  |
Fair value of securities |  | (25,521) |  |  |
Fair value of loans, net |  | (43,477) |  |  |
Fair value of premises and equipment |  | (3,856) |  |  |
Fair value of time deposits |  | 2,311 |  |  |
Fair value of subordinated and jr subordinated debentures |  | 3,707 |  |  |
Increase in core deposit intangible |  | 33,731 |  |  |
Increase in mortgage servicing rights |  | 3,344 |  |  |
Other assets |  | 6,619 |  |  |
Goodwill, purchase accounting adjustments |  | (23,142) |  |  |
Resulting goodwill from acquisition |  | $ 50,097 |  |  |
Purdum, Gray, Ingledue, Beck, Inc. |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Unallocated purchase price |  |  | $ 10,145 |  |
Less purchase accounting adjustments: |  |  |  |  |
Insurance Company intangible |  |  | 5,770 |  |
Other liabilities |  |  | (1,576) |  |
Goodwill, purchase accounting adjustments |  |  | 4,194 |  |
Resulting goodwill from acquisition |  |  | $ 5,951 |  |

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