Short-term Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Short-term Borrowings Disclosure [Abstract]
Lines of credit committed	$ 2,300,000	$ 1,500,000
Average federal funds interest rate	5.50%
Interest rate	5.50%
Loans held for investment	$ 3,579,724	3,445,476
Carrying amount of securities	999,750	997,817
Fed account borrowing capacity	1,300,000
Advances from FHLB	0	$ 0
Federal Reserve Bank [Member]
Short-term Borrowings Disclosure [Abstract]
Lines of credit committed	1,100,000
Asset Pledged as Collateral [Member] | Federal Reserve Bank [Member]
Short-term Borrowings Disclosure [Abstract]
Loans held for investment	1,500,000
Carrying amount of securities	134,900
FHLB of San Francisco [Member]
Short-term Borrowings Disclosure [Abstract]
Lines of credit committed	760,100
Debt instrument, collateral amount	$ 1,300,000
Interest rate	5.64%