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Business Combinations - Narrative (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2025 USD ($) branch $ / shares | Jul. 11, 2025 USD ($) branch $ / shares | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 754,645 |  | $ 754,645 |  |  | $ 732,417 |  |
Allowance for credit losses |  |  | 147,453 | $ 140,469 | 147,453 | $ 140,469 | $ 142,184 | $ 138,055 | $ 141,641 | $ 148,931
Allowance on PCD Loans Acquired During the Period |  |  | 106 |  | 106 |  |  |  |  |
Merger-related charges |  |  | $ 10,808 | $ 0 | $ 14,281 | $ 0 |  |  |  |
Heartland Bancshares, Inc |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |
Number of branches operated | branch |  | 4 |  |  |  |  |  |  |  |
Percentage of common stock acquired |  | 100.00% |  |  |  |  |  |  |  |
Total consideration |  | $ 111,224 |  |  |  |  |  |  |  |
Goodwill |  | 22,228 |  |  |  |  |  |  |  |
Book value of loans with deterioration of credit quality |  | 7,200 |  |  |  |  |  |  |  |
Fair value of loans with deterioration of credit quality |  | 6,400 |  |  |  |  |  |  |  |
Allowance for credit losses |  | 2,000 |  |  |  |  |  |  |  |
Allowance on PCD Loans Acquired During the Period |  | $ 100 |  |  |  |  |  |  |  |
Intangible assets weighted average useful life |  | 10 years |  |  |  |  |  |  |  |
Loans acquired |  | $ 153,294 |  |  |  |  |  |  |  |
Deposits acquired |  | $ 705,195 |  |  |  |  |  |  |  |
Per share cash consideration for shares receiving cash (in dollars per share) | $ / shares |  | $ 147.10 |  |  |  |  |  |  |  |
Per share exchange ratio for shares receiving stock |  | 4.9263 |  |  |  |  |  |  |  |
Heartland Bancshares, Inc | Acquired Non-PCD Loans |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | $ 1,900 |  |  |  |  |  |  |  |
Villages Bancorporation, Inc. | Subsequent Event |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |
Number of branches operated | branch | 19 |  |  |  |  |  |  |  |  |
Percentage of common stock acquired | 100.00% |  |  |  |  |  |  |  |  |
Total consideration | $ 829,145 |  |  |  |  |  |  |  |  |
Loans acquired | 1,300,000 |  |  |  |  |  |  |  |  |
Deposits acquired | $ 3,400,000 |  |  |  |  |  |  |  |  |
Per share cash consideration for shares receiving cash (in dollars per share) | $ / shares | $ 1,000 |  |  |  |  |  |  |  |  |
Per share exchange ratio for shares receiving stock | 38.5000 |  |  |  |  |  |  |  |  |
Acquiree shares receiving cash consideration | 25.00% |  |  |  |  |  |  |  |  |
Acquiree shares receiving stock consideration | 75.00% |  |  |  |  |  |  |  |  |
Common stock threshold of outstanding stock that will receive preferred stock | 9.75% |  |  |  |  |  |  |  |  |

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