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Business Combinations - Summary of Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) | Mar. 20, 2023 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Assets |  |  |
Goodwill |  | $ 196,461,000 | $ 196,461,000
Blackhawk Bancorp, Inc |  |  |
Assets |  |  |
Goodwill |  | $ 50,097,000 |
Consideration paid |  |  |
Consideration payable in cash | $ 1,928 |  |
Total consideration paid | 93,510,000 |  |
Blackhawk Bancorp, Inc | Fair Value Adjustments |  |  |
Assets |  |  |
Cash and due from banks | 55,600,000 |  |
Loans held for sale | 3,222,000 |  |
Loans, net | 722,866,000 |  |
Investment securities | 377,969,000 |  |
Short-term investments | 869,000 |  |
FHLB stock | 1,737,000 |  |
Premises and equipment | 12,366,000 |  |
Accrued interest receivable | 4,029,000 |  |
Prepaid expenses | 1,182,000 |  |
Other assets | 20,742,000 |  |
Core deposit intangible | 34,590,000 |  |
Income tax receivable | 2,077,000 |  |
Deferred tax asset | 22,152,000 |  |
Mortgage servicing rights | 7,031,000 |  |
Total assets acquired | 1,266,432,000 |  |
Liabilities |  |  |
Deposits | 1,194,972,000 |  |
Subordinated and Junior Subordinated debt | 16,448,000 |  |
Accrued interest payable | 1,091,000 |  |
Accrued and other liabilities | 10,508,000 |  |
Total liabilities assumed | 1,223,019,000 |  |
Net assets acquired | 43,413,000 |  |
Consideration paid |  |  |
Total consideration paid | 93,510,000 |  |
Goodwill | $ 50,097,000 |  |

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