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Loans and Investments - Charge-offs and Recoveries Narratives (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020 USD ($) loan	Jun. 30, 2020 USD ($) loan	Mar. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 loan
Loans and Investments
Provision for credit loss expense	$ 10,559	$ 64,400
Number of loans for which no provision for loan loss made | loan			0			0
Allowance for credit losses	$ 152,811	$ 152,811	$ 142,252	$ 71,069	$ 71,069
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	6
Unpaid principal balance on loans	$ 120,700	$ 120,700
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	5
Unpaid principal balance on loans	$ 111,300	$ 111,300
Weighted average accrual rate of interest (as a percent)		7.98%
Allowance for credit losses	71,400	$ 71,400		$ 61,400
Office
Loans and Investments
Provision for credit loss expense	2,436	6,745
Allowance for credit losses	8,532	8,532	6,096		$ 1,500
Hotel
Loans and Investments
Provision for credit loss expense	144	7,643
Allowance for credit losses	$ 7,672	$ 7,672	$ 7,528

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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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