Loans Portfolio - Schedule of Activity In Current Expected Credit Loss Reserve (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Financing Receivable Allowance For Credit Losses [Line Items]
Total current expected credit loss reserve, Balance		$ 67,010
Total current expected credit loss reserve, Balance		65,608
Current Expected Credit Losses
Financing Receivable Allowance For Credit Losses [Line Items]
Total current expected credit loss reserve, Balance		73,528	$ 6,000
Initial CECL allowance, January 1, 2021			78,251
Increase (reversal) in current credit loss reserve		2,102	(185)
Total current expected credit loss reserve, Balance		$ 75,630	84,066
Percent of Unpaid Principal Balance at March 31, 2022		1.00%
Current Expected Credit Losses | Specific C E C L Allowance
Financing Receivable Allowance For Credit Losses [Line Items]
Total current expected credit loss reserve, Balance	[1]	$ 6,333	6,000
Increase (reversal) in current credit loss reserve	[1]	(133)
Total current expected credit loss reserve, Balance	[1]	6,200	6,000
Current Expected Credit Losses | Loans Receivable Held For Investment
Financing Receivable Allowance For Credit Losses [Line Items]
Total current expected credit loss reserve, Balance		60,677
Initial CECL allowance, January 1, 2021			64,274
Increase (reversal) in current credit loss reserve		(1,269)	1,547
Total current expected credit loss reserve, Balance		59,408	65,821
Current Expected Credit Losses | Interests In Loans Receivable Held For Investment
Financing Receivable Allowance For Credit Losses [Line Items]
Total current expected credit loss reserve, Balance		14
Initial CECL allowance, January 1, 2021			406
Increase (reversal) in current credit loss reserve		28	(141)
Total current expected credit loss reserve, Balance		42	265
Current Expected Credit Losses | Accrued Interest Receivable
Financing Receivable Allowance For Credit Losses [Line Items]
Total current expected credit loss reserve, Balance		218
Initial CECL allowance, January 1, 2021			357
Increase (reversal) in current credit loss reserve		(218)	(14)
Total current expected credit loss reserve, Balance			343
Current Expected Credit Losses | Unfunded Loan Commitments
Financing Receivable Allowance For Credit Losses [Line Items]
Total current expected credit loss reserve, Balance	[2]	6,286
Initial CECL allowance, January 1, 2021	[2]		13,214
Increase (reversal) in current credit loss reserve	[2]	3,694	(1,577)
Total current expected credit loss reserve, Balance	[2]	$ 9,980	$ 11,637

[1] As of December 31, 2020, amounts represent specific loan loss provisions recorded on assets before the adoption of ASU 2016-13. After the adoption of ASU 2016-13 on January 1, 2021, amounts represent Specific CECL allowance

[2] The CECL allowance for unfunded commitments is included in other liabilities on the consolidated balance sheets