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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Operating Loss Carryforwards [Line Items] |  |  |
Net unrealized losses resulting in deferred tax asset | $ 207,300,000 | $ 212,700,000 |
Deferred tax assets from unrealized losses on certain investments in debt securities | 49,446,000 | 50,817,000 |
Net deferred tax assets | 102,989,000 | 113,232,000 |
Deferred tax assets | 102,989,000 | 113,232,000 |
Accrual for income tax interest or penalties | 0 |  |
Income tax expense (benefit) related to share-based compensation | $ 200,000 | $ (500,000) | $ (1,100,000)
Investment Program Proportional Amortization Method Elected Income Tax Credit And Other Income Tax Benefit Before Amortization Statement Of Cash Flows Extensible Enumeration Not Disclosed Flag | amortization | amortization |
Investment Program Proportional Amortization Method Applied Income Tax Credit And Other Tax Benefit Amortization Statement Of Cash Flows Extensible Enumeration Not Disclosed Flag | amortization | amortization |
Amortization reflected as income expense related to affordable housing project investments | $ 3,200,000 | $ 2,800,000 | $ 2,500,000
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] | Provision for income tax expense | Provision for income tax expense | Provision for income tax expense
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration] | Provision for income tax expense | Provision for income tax expense | Provision for income tax expense
Affordable housing project tax credits | $ 3,000,000 | $ 2,700,000 | $ 2,000,000
Affordable housing project tax benefits | 800,000 | 1,500,000 | $ 1,000,000
Carrying value of affordable housing tax credits | 36,300,000 | 39,500,000 |
Affordable housing tax credits, unfunded amounts | 18,300,000 | 26,300,000 |
Unrecognized income tax benefits | 0 |  |
U.S. Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net deferred tax assets | 87,000,000 | 91,000,000 |
Deferred tax assets | 2,400,000 |  |
State |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net deferred tax assets | 20,700,000 | $ 22,200,000 |
Deferred tax assets | $ 1,200,000 |  |

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