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		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Loans held-for-investment
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	$ (12,671)	$ (6,513)	$ (13,926)	$ (12,333)
Tax credit investments
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(961)	0	(787)	0
Other nonperforming assets
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	0	(6,861)	0	(6,861)
Commercial lending | Loans held-for-investment
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(12,671)	(6,595)	(13,926)	(12,418)
Commercial lending | Commercial and industrial (“C&I”) | Loans held-for-investment
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(10,419)	(6,054)	(11,674)	(14,740)
Commercial lending | CRE | Loans held-for-investment
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(2,252)	(533)	(2,252)	2,330
Commercial lending | Multifamily residential | Loans held-for-investment
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	0	(8)	0	(8)
Consumer lending | Loans held-for-investment
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	0	82	0	85
Consumer lending | HELOCs | Loans held-for-investment
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	$ 0	$ 82	$ 0	$ 85