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Business Combinations - Additional Information (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 20, 2023 | Feb. 14, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2021
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  | $ 4 |  | $ 4 |  | $ 4 |  |  |
Allowance for credit losses |  |  | $ 68,241,000 | $ 58,777,000 | $ 68,241,000 | $ 58,777,000 | $ 59,093,000 | $ 58,719,000 | $ 59,075,000 | $ 54,655,000
Delta Bancshare Company |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of issued and outstanding shares acquired |  | 100.00% |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 10.00 |  |  |  |  |  |  |  |
Share Price |  | $ 4.00 |  |  |  |  |  |  |  |
Consideration paid in cash |  | $ 15,150,000 |  |  |  |  |  |  |  |
Consideration paid in shares |  | 2,292,270 |  |  |  |  |  |  |  |
Goodwill acquired during period |  | $ 28,200,000 |  |  |  |  |  |  |  |
Pre-tax of acquisition costs |  |  | 2,600,000 |  | 2,600,000 |  |  |  |  |
Pre-tax of acquisition costs |  |  |  |  |  |  | $ 2,100,000 |  |  |
Loans |  | 418,509,000 |  |  |  |  |  |  |  |
Accreted to interest income over the remaining term of loans |  | 8,200,000 |  |  |  |  |  |  |  |
Elimination of deferred fees and unearned discounts previously recorded by Jefferson Bank |  |  |  |  | 300,000 |  |  |  |  |
Allowance for credit losses for loans identified as PCD |  | 863,000 |  |  |  |  |  |  |  |
Change in acquired time deposits |  | 560,378,000 |  |  |  |  |  |  |  |
Change in FHLB advances |  | 45,075,000 |  |  |  |  |  |  |  |
Allowance for credit losses |  | (863,000) |  |  |  |  |  |  |  |
Delta Bancshare Company | Core Deposit Intangibles |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible asset fair value |  | $ 5,920,000 |  |  |  |  |  |  |  |
Intangible asset estimated useful life |  | 10 years |  |  |  |  |  |  |  |
Delta Bancshare Company | Fair Value Adjustments |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | $ (7,924,000) |  |  |  |  |  |  |  |
Change in acquired time deposits |  | 1,759,000 |  |  |  |  |  |  |  |
Change in FHLB advances |  | 75,000 |  |  |  |  |  |  |  |
Allowance for credit losses |  | 4,525,000 |  |  |  |  |  |  |  |
Delta Bancshare Company | Fair Value Adjustments | Core Deposit Intangibles |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible asset fair value |  | 5,920,000 |  |  |  |  |  |  |  |
Delta Bancshare Company | Acquired Book Value |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Loans |  | 426,433,000 |  |  |  |  |  |  |  |
Purchased credit deteriorated loans |  | 18,800,000 |  |  |  |  |  |  |  |
Change in acquired time deposits |  | 558,619,000 |  |  |  |  |  |  |  |
Change in FHLB advances |  | 45,000,000 |  |  |  |  |  |  |  |
Allowance for credit losses |  | (5,388,000) |  |  |  |  |  |  |  |
Delta Bancshare Company | Acquired Book Value | Core Deposit Intangibles |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible asset fair value |  | $ 0 |  |  |  |  |  |  |  |
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 |  |  | $ 2,100,000 | $ 0 | $ 2,600,000 | $ 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] |  |  |  |  |  |  |  |  |  |
Loans | $ 722,866,000 |  |  |  |  |  |  |  |  |
Change in acquired time deposits | $ 1,194,972,000 |  |  |  |  |  |  |  |  |

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