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v3.23.3

Securities - Narrative (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) debt_security | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) debt_security | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Schedule of Investments [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | $ 0 |  | $ 0 |  | $ 0 |
Transferred Securities, Unrealized Loss, Before Tax | 115,600,000 |  | 115,600,000 |  | 121,500,000 |
Securities transferred, Unrealized Loss, Net of Tax | 91,300,000 |  | 91,300,000 |  | 96,000,000 |
Fair value of securities transferred from AFS to HTM |  |  | 0 |  | 1,250,000,000 |
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] |  |  |  |  |  |
Net gain (loss) on sale of securities AFS | 11,000 | $ (99,000) | (5,590,000) | $ (3,819,000) |  |
Gross realized gains on AFS securities |  |  | 1,400,000 | 584,000 |  |
Gross realized losses on AFS securities |  |  | 7,000,000 | 4,400,000 |  |
Equity investments | 9,454,000 |  | 9,454,000 |  | 11,181,000 |
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract] |  |  |  |  |  |
Sale of HTM portfolio | 0 | 0 | 0 | 0 |  |
Interest receivable | 39,646,000 |  | 39,646,000 |  | 49,350,000 |
Debt Securities, Held-to-maturity, Nonaccrual | 0 |  | 0 |  | 0 |
FHLB stock with other-than-temporary impairment | 0 |  | 0 |  |  |
Other-than-temporarily impaired equity investments | $ 0 |  | $ 0 |  |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | debt_security | 585 |  | 585 |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | $ 325,823,000 | 195,127,000 | $ 325,823,000 | 195,127,000 | 199,252,000 | $ 201,753,000
Less: Net gains recognized during the period on equity investments sold during the period | 0 | 0 | 5,058,000 | 0 |  |
Debt Securities, Available-for-Sale, Accrued Interest | 10,800,000 |  | 10,800,000 |  | 16,900,000 |
Debt Securities, Held-to-Maturity, Accrued Interest | 8,500,000 |  | 8,500,000 |  | 13,600,000 |
State and political subdivisions |  |  |  |  |  |
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract] |  |  |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Credit Loss Expense (Reversal) | 0 | 0 | 0 | 0 |  |
Corporate bonds and other |  |  |  |  |  |
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract] |  |  |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Credit Loss Expense (Reversal) | 0 | $ 0 | 0 | $ 0 |  |
Asset Pledged as Collateral |  |  |  |  |  |
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract] |  |  |  |  |  |
Debt Securities | 2,480,000,000 |  | 2,480,000,000 |  | 1,820,000,000 |
Financial Asset, Past Due |  |  |  |  |  |
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract] |  |  |  |  |  |
Securities held to maturity (estimated fair value of $138,879) | $ 0 |  | $ 0 |  | $ 0 |

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