Fair Value Measurement and Fair Value of Financial Instruments - Increase (Decrease) in Value of Assets Measured on a Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loans held-for-investment
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in fair value of assets	$ (7,375)	$ (32,928)	$ (19,815)
Loans held-for-investment | Commercial Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in fair value of assets	(7,335)	(33,094)	(19,811)
Loans held-for-investment | Commercial Lending | C&I
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in fair value of assets	(6,152)	(25,996)	(9,580)
Loans held-for-investment | Commercial Lending | CRE
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in fair value of assets	(1,183)	(7,098)	(10,231)
Loans held-for-investment | Consumer Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in fair value of assets	(40)	166	(4)
Loans held-for-investment | Consumer Lending | HELOCs
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in fair value of assets	(40)	166	(4)
Investments in qualified affordable housing partnerships, tax credit and other investments, net
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in fair value of assets	(1,140)	469	877
Other nonperforming assets
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in fair value of assets	$ 0	$ (6,861)	$ (4,241)