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Business Combinations - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 25, 2025 USD ($) shares | Sep. 24, 2025 USD ($) $ / shares | May 12, 2025 USD ($) | Apr. 30, 2025 USD ($) branch $ / shares shares | Jul. 31, 2024 USD ($) | Sep. 30, 2025 USD ($) $ / shares | Jun. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) $ / shares | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) $ / shares
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 136,620 |  |  | $ 136,620 |  | $ 128,160
Merger and acquisition |  |  |  |  |  | $ 233 |  | $ 109 | $ 11,558 | $ 109 |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 1.00 |  |  | $ 1.00 |  | $ 1.00
Commonwealth Benefits Group Aquisition |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  | $ 2,000 |  |  |  |  |  |
Additional consideration pursuant to earnout period |  |  |  |  | $ 800 |  |  |  |  |  |
Additional consideration earn out period (in years) |  |  |  |  | 3 years |  |  |  |  |  |
Goodwill |  |  |  |  | $ 1,100 |  |  |  |  |  |
Merger and acquisition |  |  |  |  |  |  |  |  |  |  | $ 545
Charis Insurance Group Inc |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  | $ 4,000 |  |  |  |  |  |  |  |
Goodwill |  |  | $ 1,600 |  |  |  |  |  |  |  |
Merger and acquisition |  |  |  |  |  |  |  |  | $ 164 |  |
William Penn Acquisition |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  | $ 103,213 |  |  |  |  |  |  |
Goodwill |  |  |  | $ 6,857 |  |  |  |  |  |  |
Merger and acquisition |  |  |  |  |  | $ 3 |  |  | 11,200 |  |
Percentage of voting interest acquired |  |  |  | 100.00% |  |  |  |  |  |  |
Additional branches | branch |  |  |  | 12 |  |  |  |  |  |  |
Closing price per share (in dollars per share) | $ / shares |  |  |  | $ 29.05 |  |  |  |  |  |  |
Equity interest issued or issuable, converted and issued (in shares) | shares |  |  |  | 0.426 |  |  |  |  |  |  |
Equity interest issued or issuable, number of shares (in shares) | shares |  |  |  | 3,506,795 |  |  |  |  |  |  |
Equity interest issued or issuable, additional number of shares (in shares) | shares |  |  |  | 538,447 |  |  |  |  |  |  |
Grant date fair value |  |  |  | $ 3,100 |  |  |  |  |  |  |
Amount at purchase price |  |  |  | 358 |  |  |  |  |  |  |
Discount (premium) |  |  |  | 15 |  |  |  |  |  |  |
Amount at par value |  |  |  | 343 |  |  |  |  |  |  |
Provision expense |  |  |  | 2,300 |  |  |  |  |  |  |
Revenue |  |  |  |  |  | 5,000 |  |  | 9,500 |  |
Net income (loss) |  |  |  |  |  | $ (255) |  |  | $ 438 |  |
William Penn Acquisition | Pre-Combination Vesting |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Grant date fair value |  |  |  | 1,300 |  |  |  |  |  |  |
William Penn Acquisition | Post-Combination Vesting |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Grant date fair value |  |  |  | $ 1,800 |  |  |  |  |  |  |
1st Colonial Bancorp, Inc. |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Closing price per share (in dollars per share) | $ / shares |  | $ 18.50 |  |  |  |  |  |  |  |  |
Business combination, price of acquisition, expected |  | $ 101,000 |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.0 |  |  |  |  |  |  |  |  |
Business combination, exchange ratio |  | 0.6945 |  |  |  |  |  |  |  |  |
Cumberland Advisors |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business combination, price of acquisition, expected | $ 5,500 |  |  |  |  |  |  |  |  |  |
Equity interest purchase price, percent | 70.00% |  |  |  |  |  |  |  |  |  |
Contingent consideration, maximum amount | $ 1,000 |  |  |  |  |  |  |  |  |  |
Annualized revenue |  |  |  |  |  |  | $ 9,000 |  |  |  |
Business combination, recognized asset acquired, asset, expected | $ 3,300,000 |  |  |  |  |  |  |  |  |  |
Cumberland Advisors | Stock Appreciation Rights (SARs) |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity interest issued or issuable, number of shares (in shares) | shares | 200,000 |  |  |  |  |  |  |  |  |  |
Maximum aggregate value | $ 1,200 |  |  |  |  |  |  |  |  |  |

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