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Borrowed Funds - Narrative (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
May 03, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Short-Term Debt [Line Items] |  |  |  |
Short-term borrowings |  | $ 365,000,000 | $ 272,000,000 |
Outstanding amount for short-term debt |  | 422,500,000 | 293,900,000 |
Unused funds for short-term debt |  | 4,100,000,000 |  |
Securities and loans pledged |  | 3,100,000,000 | 797,800,000 |
Issuance of common stock |  | 3,242,000 | 0 | $ 0
Subordinated debentures owed to unconsolidated subsidiary trusts |  | 17,013,000 | $ 0 |
SFG Capital Trust I |  |  |  |
Short-Term Debt [Line Items] |  |  |  |
Subordinated debentures owed to unconsolidated subsidiary trusts | $ 3,600,000 |  |  |
SFG Capital Trust II |  |  |  |
Short-Term Debt [Line Items] |  |  |  |
Subordinated debentures owed to unconsolidated subsidiary trusts | 7,700,000 |  |  |
SFG Capital Trust III |  |  |  |
Short-Term Debt [Line Items] |  |  |  |
Subordinated debentures owed to unconsolidated subsidiary trusts | 8,300,000 |  |  |
SFG Capital Trust I |  |  |  |
Short-Term Debt [Line Items] |  |  |  |
SFG capital trust issued | 3,500,000 |  |  |
Issuance of common stock | 109,000 |  |  |
SFG Capital Trust II |  |  |  |
Short-Term Debt [Line Items] |  |  |  |
SFG capital trust issued | 7,500,000 |  |  |
Issuance of common stock | 232,000 |  |  |
SFG Capital Trust III |  |  |  |
Short-Term Debt [Line Items] |  |  |  |
SFG capital trust issued | 8,000,000 |  |  |
Issuance of common stock | $ 248,000 |  |  |
SFG Capital Trust I |  |  |  |
Short-Term Debt [Line Items] |  |  |  |
Subsidiary, ownership percentage, parent (as a percent) | 100.00% |  |  |
SFG Capital Trust II |  |  |  |
Short-Term Debt [Line Items] |  |  |  |
Subsidiary, ownership percentage, parent (as a percent) | 100.00% |  |  |
SFG Capital Trust III |  |  |  |
Short-Term Debt [Line Items] |  |  |  |
Subsidiary, ownership percentage, parent (as a percent) | 100.00% |  |  |
Subordinated debentures |  |  |  |
Short-Term Debt [Line Items] |  |  |  |
Subordinated debentures, net |  | 105,000,000 |  |
Subordinated debentures owed to unconsolidated subsidiary trusts |  |  |  |
Short-Term Debt [Line Items] |  |  |  |
Subordinated debentures, net |  | 19,589,000 |  |
Subordinated debentures owed to unconsolidated subsidiary trusts | SFG Capital Trust I |  |  |  |
Short-Term Debt [Line Items] |  |  |  |
Basis points | 3.45% |  |  |
Subordinated debentures owed to unconsolidated subsidiary trusts | SFG Capital Trust II |  |  |  |
Short-Term Debt [Line Items] |  |  |  |
Basis points | 2.80% |  |  |
Subordinated debentures owed to unconsolidated subsidiary trusts | SFG Capital Trust III |  |  |  |
Short-Term Debt [Line Items] |  |  |  |
Basis points | 1.45% |  |  |
Subordinated Debentures, Issued in Fourth Quarter of 2021 | Subordinated debentures |  |  |  |
Short-Term Debt [Line Items] |  |  |  |
Debt instrument, face amount | $ 75,000,000 |  |  |
Debt instrument, fair value | 61,500,000 |  |  |
Amortization of debt discount (premium) | $ 13,500,000 |  |  |
Subordinated debentures, net |  | 65,000,000 |  |
Number of maturity (in years) | 5 years |  |  |
Tier 2 capital reduction (as a percent) | 20.00% |  |  |
Subordinated borrowing bears interest (as a percent) | 3.25% |  |  |
Basis points | 2.30% |  |  |
Debt instrument, term (in years) | 10 years |  |  |
Number of years not pre payable issuance | 5 years |  |  |
Subordinated Debentures, Issued in Third Quarter of 2020 | Subordinated debentures |  |  |  |
Short-Term Debt [Line Items] |  |  |  |
Debt instrument, face amount | $ 30,000,000 |  |  |
Debt instrument, fair value | 29,800,000 |  |  |
Amortization of debt discount (premium) | $ 200,000 |  |  |
Subordinated debentures, net |  | $ 29,900,000 |  |
Number of maturity (in years) | 5 years |  |  |
Tier 2 capital reduction (as a percent) | 20.00% |  |  |
Subordinated borrowing bears interest (as a percent) | 5.00% |  |  |
Basis points | 4.87% |  |  |
Debt instrument, term (in years) | 10 years |  |  |
Number of years not pre payable issuance | 5 years |  |  |
Minimum |  |  |  |
Short-Term Debt [Line Items] |  |  |  |
Interest rate for short-term debt |  | 4.43% | 4.38% |
Maximum |  |  |  |
Short-Term Debt [Line Items] |  |  |  |
Interest rate for short-term debt |  | 4.57% | 5.57% |

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