Short-term Borrowings (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Short-term Borrowings Disclosure [Abstract]
Remaining borrowing capacity	$ 2,100,000	$ 2,200,000
Loans held for investment	3,628,293	3,579,724
Federal Reserve Bank [Member]
Short-term Borrowings Disclosure [Abstract]
Remaining borrowing capacity	1,200,000
Collateral amount	1,500,000
Outstanding advances	$ 0	$ 0
Asset Pledged as Collateral [Member] | Federal Reserve Bank [Member]
Short-term Borrowings Disclosure [Abstract]
Interest rate	5.00%
Loans held for investment	$ 1,500,000
FHLB of San Francisco [Member]
Short-term Borrowings Disclosure [Abstract]
Maximum borrowing capacity	791,200
Collateral amount	$ 1,300,000
Interest rate	5.15%