Fair Value Measurements - Schedule of Financial Assets and Financial Liabilities Measured at Fair Value (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gain (loss)	$ 1,923,000	$ (2,193,000)
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	$ 3,700,000		$ 3,400,000
Items measured on a recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available-for-sale	744,944,000		753,892,000
Equity investments	54,788,000		53,166,000
Interest rate derivative asset	104,149,000		87,776,000
Interest rate derivative liability	(105,118,000)		(87,848,000)
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	46,989,000		43,036,000
Equity investments	0		0
Interest rate derivative asset	0		0
Interest rate derivative liability	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	697,955,000		710,856,000
Equity investments	54,788,000		53,166,000
Interest rate derivative asset	104,149,000		87,776,000
Interest rate derivative liability	(105,118,000)		(87,848,000)
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
Equity investments	0		0
Interest rate derivative asset	0		0
Interest rate derivative liability	0		0
Items measured on a non-recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investments	48,413,000		46,997,000
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	22,206,000		18,509,000
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
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
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
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
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	44,738,000		43,576,000
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	22,206,000		18,509,000
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	44,700,000		43,600,000
Unrealized gain (loss)	$ 0		$ 0