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Business Combinations - Additional Information (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 20, 2023 | Sep. 30, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Business Acquisition [Line Items] |  |  |  |  |
Common stock, par value (in dollars per share) |  |  | $ 4 | $ 4 |
Intangible asset estimated useful life |  |  | 15 years |  |
Blackhawk Bancorp, Inc |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Conversion of Stock, Shares Issued | 1.15 |  |  |  |
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 | $ 2,000 |  |  |  |
Purchase price | $ 93,510,000 |  |  |  |
Consideration paid in shares | 3,290,222 |  |  |  |
Goodwill acquired during period | $ 50,100,000 | $ 50,100,000 |  |  |
Pre-tax of acquisition costs |  |  | $ 2,500,000 | $ 8,200,000 | $ 0
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] |  |  |  |  |
Purchase price | $ 93,510,000 |  |  |  |
Loans, net | 722,866,000 |  |  |  |
Change in acquired time deposits | $ 1,194,972,000 |  |  |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479405/805-10-25-23 + Details
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