Loans Receivable - Aging Summary of Non-PCI Loans Held for Investment (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Loan receivable past due	$ (910,006)
Current or less than 30 days past due
Financing Receivable, Past Due [Line Items]
Current or less than 30 days past due	45,012
30-59 days past due
Financing Receivable, Past Due [Line Items]
Loan receivable past due	0
60-89 days past due
Financing Receivable, Past Due [Line Items]
Loan receivable past due	0
90 days or more past due or nonaccrual
Financing Receivable, Past Due [Line Items]
Total past due loans receivables	(955,018)
Non-PCI Loans
Financing Receivable, Past Due [Line Items]
Loan receivable past due		$ 1,352,476
Non-PCI Loans | Current or less than 30 days past due
Financing Receivable, Past Due [Line Items]
Loan receivable past due		1,042,260
Non-PCI Loans | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Loan receivable past due		0
Non-PCI Loans | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Loan receivable past due		0
Non-PCI Loans | 90 days or more past due or nonaccrual
Financing Receivable, Past Due [Line Items]
Loan receivable past due		$ 310,216
Fair Value
Financing Receivable, Past Due [Line Items]
Loan receivable past due	1,588,427
Fair Value | Current or less than 30 days past due
Financing Receivable, Past Due [Line Items]
Current or less than 30 days past due	1,060,721
Fair Value | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Loan receivable past due	0
Fair Value | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Loan receivable past due	0
Fair Value | 90 days or more past due or nonaccrual
Financing Receivable, Past Due [Line Items]
Total past due loans receivables	527,706
Carrying Value
Financing Receivable, Past Due [Line Items]
Loan receivable past due	2,498,433
Carrying Value | Current or less than 30 days past due
Financing Receivable, Past Due [Line Items]
Current or less than 30 days past due	1,015,709
Carrying Value | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Loan receivable past due	0
Carrying Value | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Loan receivable past due	0
Carrying Value | 90 days or more past due or nonaccrual
Financing Receivable, Past Due [Line Items]
Total past due loans receivables	$ 1,482,724