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Securities - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Proceeds from sale of available-for-sale debt securities, including legacy securities | $ 0 | $ 0 | $ 0 | $ 86,800,000 |
Gross losses from sale of securities |  |  |  | 3,800,000 |
Unrealized losses on mortgage backed securities of government sponsored entities | 173,426,000 |  | 173,426,000 |  | $ 211,338,000
Fair value of securities in unrealized loss position | 1,395,953,000 |  | 1,395,953,000 |  | 1,696,572,000
Held-to-maturity securities, allowance for credit loss | 0 |  | 0 |  |
Federal home loan bank and federal reserve stock recorded in other assets | 100,200,000 |  | 100,200,000 |  | 77,300,000
Accrued interest receivable on AFS debt securities | 11,500,000 |  | 11,500,000 |  | 9,200,000
Accrued interest receivable on HTM debt securities | 1,000,000.0 |  | 1,000,000.0 |  | 1,000,000.0
Asset Pledged as Collateral |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fair value of debt securities pledged as collateral | 1,400,000,000 |  | 1,400,000,000 |  |
CRA - Qualified Mutual Fund |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Gross losses from sale of securities |  | $ 44,000 |  | $ 200,000 |
Gross gains from sale of securities | 39,000 |  | 200,000 |  |
Investment in mutual fund carried at fair value | 13,800,000 |  | 13,800,000 |  | 13,500,000
U.S. Treasury securities and obligations of U.S. government agencies |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Unrealized losses on mortgage backed securities of government sponsored entities | 377,000 |  | 377,000 |  | 522,000
Fair value of securities in unrealized loss position | 15,864,000 |  | 15,864,000 |  | 22,885,000
Allowance for credit losses on AFS debt securities | 0 |  | 0 |  |
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Unrealized losses on mortgage backed securities of government sponsored entities | 164,800,000 |  | 164,800,000 |  |
Fair value of securities in unrealized loss position | 1,200,000,000 |  | 1,200,000,000 |  |
Allowance for credit losses on AFS debt securities | 0 |  | 0 |  |
Private mortgage-backed securities and collateralized mortgage obligations |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Unrealized losses on mortgage backed securities of government sponsored entities | 6,289,000 |  | 6,289,000 |  | 8,382,000
Fair value of securities in unrealized loss position | 89,909,000 |  | 89,909,000 |  | 108,420,000
Allowance for credit losses on AFS debt securities | $ 0 |  | $ 0 |  |
Average credit support percentage | 22.00% |  | 22.00% |  |
CLOs |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Unrealized losses on mortgage backed securities of government sponsored entities | $ 597,000 |  | $ 597,000 |  | 166,000
Fair value of securities in unrealized loss position | 116,206,000 |  | 116,206,000 |  | 51,006,000
Allowance for credit losses on AFS debt securities | $ 0 |  | $ 0 |  |
CLOs | Standard & Poor's, AAA Rating |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Number of positions held, percentage of total | 37.00% |  | 37.00% |  |
CLOs | Standard & Poor's, AA Rating |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Number of positions held, percentage of total | 26.00% |  | 26.00% |  |
Obligations of state and political subdivisions |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Unrealized losses on mortgage backed securities of government sponsored entities | $ 1,400,000 |  | $ 1,400,000 |  | 1,449,000
Fair value of securities in unrealized loss position | 5,741,000 |  | 5,741,000 |  | $ 5,690,000
Allowance for credit losses on AFS debt securities | $ 0 |  | $ 0 |  |

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