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Goodwill and Intangible Assets - Schedule of Reconciliation of Purchase Price Paid for Acquisition and Goodwill Recorded (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Mar. 31, 2022
Less purchase accounting adjustments: |  |  |  |  |
Resulting goodwill from acquisition | $ 196,461 |  |  | $ 140,412 |
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 | $ 50,100 |  |  |
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 |  | $ 6,000 |  |
Delta Bancshares Company |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Unallocated purchase price | 29,791 |  |  |  |
Less purchase accounting adjustments: |  |  |  |  |
Fair value of securities | (2,836) |  |  |  |
Fair value of loans, net | (3,399) |  |  |  |
Fair value of premises and equipment | 3,508 |  |  |  |
Fair value of time deposits | (1,759) |  |  |  |
Fair value of FHLB advances | (75) |  |  |  |
Core deposit intangible | 5,920 |  |  |  |
Other assets | (570) |  |  |  |
Other liabilities | 444 |  |  |  |
Goodwill, purchase accounting adjustments | 1,233 |  |  |  |
Resulting goodwill from acquisition | $ 28,558 |  |  |  | $ 28,600

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