Borrowing Arrangements - Federal Home Loan Bank Borrowings, Federal Reserve Bank Borrowings, and Available Lines of Credit (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Borrowing Arrangements
Loans, net of deferred fees	$ 3,298,550,000	$ 3,087,326,000	$ 2,619,261,000
FHLB | Line of credit
Borrowing Arrangements
Loans, net of deferred fees	1,000,207,000	1,008,601,000
FHLB | Line of credit | FHLB of San Francisco
Borrowing Arrangements
FHLB overnight borrowings	0	0
FHLB
Borrowing Arrangements
Loans, net of deferred fees		280,748,000
Securities pledged as collateral	1,085,000
Amount outstanding	0
Line of credit		205,631,000
FHLB | Line of credit
Borrowing Arrangements
Securities pledged as collateral		1,551,000
Amount outstanding		$ 0
FHLB | Line of credit | FHLB of San Francisco
Borrowing Arrangements
Loans, net of deferred fees	254,243,000
Line of credit	$ 162,631,000