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Fair Value Measurements - Schedule of Financial Assets and Financial Liabilities Measured at Fair Value (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unrealized gain (loss) | $ 1,452,000 | $ 3,362,000 | $ (446,000) | $ (8,853,000) |
Measurement Input, Discount Rate |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Minimum range of unobservable inputs |  |  | 0.00% |  | 0.00%
Maximum range of unobservable inputs |  |  | 8.00% |  | 8.00%
Measurement Input, Appraisal Adjustments |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Minimum range of unobservable inputs |  |  | 0.00% |  | 0.00%
Maximum range of unobservable inputs |  |  | 10.00% |  | 10.00%
Fair Value Measured at Net Asset Value Per Share |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Equity investment funds measured at NAV | 3,400,000 |  | $ 3,400,000 |  | $ 3,000,000
Items measured on a recurring basis |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt securities available-for-sale | 453,208,000 |  | 453,208,000 |  | 457,648,000
Equity investments | 50,945,000 |  | 50,945,000 |  | 61,942,000
Interest rate derivative asset | 137,090,000 |  | 137,090,000 |  | 113,420,000
Interest rate derivative liability | (138,806,000) |  | (138,806,000) |  | (113,473,000)
Items measured on a recurring basis | Level 1 Inputs |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt securities available-for-sale | 42,054,000 |  | 42,054,000 |  | 0
Equity investments | 0 |  | 0 |  | 430,000
Interest rate derivative asset | 0 |  | 0 |  | 0
Interest rate derivative liability | 0 |  | 0 |  | 0
Items measured on a recurring basis | Level 2 Inputs |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt securities available-for-sale | 411,154,000 |  | 411,154,000 |  | 457,648,000
Equity investments | 50,945,000 |  | 50,945,000 |  | 61,511,000
Interest rate derivative asset | 137,090,000 |  | 137,090,000 |  | 113,420,000
Interest rate derivative liability | (138,806,000) |  | (138,806,000) |  | (113,473,000)
Items measured on a recurring basis | Level 3 Inputs |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Debt securities available-for-sale | 0 |  | 0 |  | 0
Equity investments | 0 |  | 0 |  | 0
Interest rate derivative asset | 0 |  | 0 |  | 0
Interest rate derivative liability | 0 |  | 0 |  | 0
Items measured on a non-recurring basis |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Equity investments | 46,963,000 |  | 46,963,000 |  | 40,095,000
Items measured on a non-recurring basis | Loans measured for impairment based on the fair value of the underlying collateral |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Loans measured for impairment based on the fair value of the underlying collateral | 19,080,000 |  | 19,080,000 |  | 9,635,000
Items measured on a non-recurring basis | Level 1 Inputs |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Equity investments | 0 |  | 0 |  | 0
Items measured on a non-recurring basis | Level 1 Inputs | Loans measured for impairment based on the fair value of the underlying collateral |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Loans measured for impairment based on the fair value of the underlying collateral | 0 |  | 0 |  | 0
Items measured on a non-recurring basis | Level 2 Inputs |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Equity investments | 0 |  | 0 |  | 0
Items measured on a non-recurring basis | Level 2 Inputs | Loans measured for impairment based on the fair value of the underlying collateral |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Loans measured for impairment based on the fair value of the underlying collateral | 0 |  | 0 |  | 0
Items measured on a non-recurring basis | Level 3 Inputs |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Equity investments | 43,576,000 |  | 43,576,000 |  | 37,076,000
Items measured on a non-recurring basis | Level 3 Inputs | Loans measured for impairment based on the fair value of the underlying collateral |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Loans measured for impairment based on the fair value of the underlying collateral | 19,080,000 |  | 19,080,000 |  | 9,635,000
Items measured on a non-recurring basis | Fair Value Measured at Net Asset Value Per Share |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Equity investments | $ 43,600,000 |  | 43,600,000 |  | 37,100,000
Unrealized gain (loss) |  |  | $ 0 |  | $ 20,000,000

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