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Goodwill and Intangible Assets - Schedule of Reconciliation of Purchase Price Paid for Acquisition and Goodwill Recorded (Details) - USD ($) $ in Thousands | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023
Less purchase accounting adjustments: |  |  |  |
Goodwill | $ 196,461 | $ 196,461 |  |
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 |  |  |
Goodwill | 5,951 |  |  | $ 6,000
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) |  |  |
Goodwill | $ 50,097 |  | $ 50,100 |

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