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Significant Accounting Policies (Details) - USD ($) $ in Thousands		3 Months Ended
	Jun. 01, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Proceeds from loans held for sale previously classified as portfolio loans		$ 449	$ 25,038
Loans held for investment		13,117,392		$ 13,236,433
Opus Bank
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fair value of PCD loans	$ 841,200
Initial ACL Recorded for PCD Loans	$ 21,200
Commercial loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment		$ 2,070,047		$ 2,229,588
Min
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Weighted average useful life		6 years
Max
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Weighted average useful life		11 years