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Loans and Investments - Charge-offs and Recoveries Narratives (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($) loan	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) loan	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)
Loans and Investments
Number of loans for which no provision for loan loss made | loan	0		0
Allowance for credit losses	$ 138,447	$ 147,300	$ 148,329	$ 152,811	$ 142,252	$ 152,811
Unfunded commitments related to structured loans and investments	$ 524,700		353,800
Six loans collateralized by a land development project | Maturity date of March 2020
Loans and Investments
Number of loans with unpaid principal balance | loan	6
Unpaid principal balance on loans	$ 121,300
Five loans collateralized by a land development project | Maturity date of March 2020
Loans and Investments
Number of loans with unpaid principal balance | loan	5
Unpaid principal balance on loans	$ 112,000
Weighted average accrual rate of interest (as a percent)	7.91%
Allowance for credit losses	$ 71,400		71,400
Hotel
Loans and Investments
Allowance for credit losses	$ 225	$ 7,754	$ 7,759	$ 7,672	$ 7,528

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Represents the weighted average accrual rate of interest of impaired financing receivables.

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Represents the amount of outstanding unfunded commitments related to loans and investments that the entity is obligated to fund as the borrowers meet certain requirements.

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Represents the number of loans for which the value of the collateral securing the loan was less than the carrying value of the loan for which the entity has not recorded a provision for loan loss.

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Number of loans with principal due that have been delinquent.

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Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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