Borrowing Arrangements - Summary of Borrowings Available to the Company from Institutions (Details) $ in Thousands	Mar. 31, 2022 USD ($)
Debt Disclosure [Line Items]
Amount of borrowings	$ 637,108
FHLB—San Francisco
Debt Disclosure [Line Items]
Amount of borrowings	364,637
Federal Reserve Bank
Debt Disclosure [Line Items]
Amount of borrowings	172,471
Pacific Coast Bankers Bank
Debt Disclosure [Line Items]
Amount of borrowings	50,000
Zions Bank
Debt Disclosure [Line Items]
Amount of borrowings	25,000
First Horizon Bank
Debt Disclosure [Line Items]
Amount of borrowings	$ 25,000