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Business Combinations - Additional Information (Details) - USD ($) |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 20, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Business Acquisition [Line Items] |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 4 |  | $ 4 |
Allowance for credit losses |  | $ 67,936,000 | $ 58,223,000 | $ 68,675,000 | $ 59,093,000
Blackhawk Bancorp, Inc |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Percentage of issued and outstanding shares acquired | 100.00% |  |  |  |
Common stock, par value (in dollars per share) | $ 0.01 |  |  |  |
Share Price | $ 4 |  |  |  |
Consideration paid in cash | $ 1,928 |  |  |  |
Consideration paid in shares | 3,290,222 |  |  |  |
Conversion of common stock | 1.15 |  |  |  |
Goodwill acquired during period | $ 50,100,000 |  |  |  |
Pre-tax of acquisition costs |  | $ 2,200,000 | $ 93,000 |  |
Allowance for credit losses for loans identified as PCD | 3,791,000 |  |  |  |
Purchased credit deteriorated loans | 105,983,000 |  |  |  |
Blackhawk Bancorp, Inc | ASU 2016-13 |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Allowance for credit losses | 3,800,000 |  |  |  |
Allowance for credit losses on non-PCD loans | $ 618,330,000 |  |  |  |
Blackhawk Bancorp, Inc | Core Deposit Intangibles |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible asset estimated useful life | 10 years |  |  |  |
Blackhawk Bancorp, Inc | Fair Value Adjustments |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans, net | $ 722,866,000 |  |  |  |
Change in acquired time deposits | $ 1,194,972,000 |  |  |  |

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