Short-term Borrowings (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Short-term Borrowings Disclosure [Abstract]
Remaining borrowing capacity	$ 2,100,000	$ 2,200,000
Average federal funds interest rate	5.50%
Loans held for investment	$ 3,607,338	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]
Loans held for investment	1,500,000
FHLB of San Francisco [Member]
Short-term Borrowings Disclosure [Abstract]
Maximum borrowing capacity	811,800
Collateral amount	$ 1,000,000
Interest rate	5.63%