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Premises and Equipment - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) holding | Jun. 30, 2024 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Depreciation and amortization |  |  | $ 35,400 | $ 34,700 | $ 41,700 |
Gain (loss) on disposal of property and equipment |  | $ (700) | (1,700) | (4,600) | (6,300) |
Proceeds from sale of property and equipment |  |  | 6,769 | 6,894 | $ 300 |
Premises and equipment, net |  |  | 406,963 | 429,561 |  |
Number of locations closed | holding |  |  |  |  | 14 |
Reduction in real estate |  |  |  |  | 45.00% |
Cash proceeds from sale of business |  | $ 4,100 |  |  |  |
Manchester Property |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Gain (loss) on disposal of property and equipment |  |  | 900 |  |  |
Proceeds from sale of property and equipment |  |  | 1,600 |  |  |
Premises and equipment, net |  |  |  |  |  | $ 700
Yonkers Property |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Transfers from (to) property and equipment | $ 800 |  |  |  |  |
Write-downs | 400 |  |  |  |  |
Proceeds from sale of property and equipment | 700 |  |  |  |  |
Costs to sell | $ 100 |  |  |  |  |
New Britain, Connecticut Facility |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Write-down of real estate |  |  |  |  | $ 1,800 |
Assets held for disposition |  |  |  |  | $ 4,800 |
Disposal Group, Held-for-Sale, Not Discontinued Operations |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Gain (loss) on disposal of property and equipment |  |  | 400 | 1,100 |  |
Carrying amount of assets held for disposition |  |  | 5,100 | 3,700 |  |
Transfers from (to) property and equipment |  |  | 5,600 | 5,100 |  |
Write-downs |  |  | 300 | 100 |  |
Proceeds from sale of property and equipment |  |  | $ 4,400 | $ 2,700 |  |

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