Fair Value Measurement and Fair Value of Financial Instruments - Increase (Decrease) in Fair Value of Assets Measured on a Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Loans held-for-investment
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	$ (10,088)	$ (21,233)	$ (14,891)	$ (33,572)
Loans held-for-investment | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(10,047)	(21,314)	(14,850)	(33,738)
Loans held-for-investment | Commercial lending | Commercial and industrial (“C&I”)
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	366	(15,265)	(4,437)	(30,011)
Loans held-for-investment | Commercial lending | CRE
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	0	(118)	0	2,212
Loans held-for-investment | Commercial lending | Multifamily residential
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	0	(5,931)	0	(5,939)
Loans held-for-investment | Commercial lending | Construction and land
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(10,413)	0	(10,413)	0
Loans held-for-investment | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(41)	81	(41)	166
Loans held-for-investment | Consumer lending | HELOCs
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(41)	81	(41)	166
Tax credit investments
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(790)	0	(1,577)	0
Other nonperforming assets
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	$ 0	$ 0	$ 0	$ (6,861)