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Borrowing Arrangements (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Borrowing Arrangements
Investments securing FHLB advances, amortized cost	$ 761,249,000
Available-for-sale debt securities	768,719,000	$ 710,092,000
Federal funds purchased	0	0
Federal Home Loan Bank Advances
Borrowing Arrangements
Loans Pledged as Collateral	453,093,000
Remaining borrowing capacity	244,763,000
Federal Home Loan Bank Advances | Securities Pledged as Collateral
Borrowing Arrangements
Investments securing FHLB advances, amortized cost	159,000	169,000
Available-for-sale debt securities	168,000	$ 178,000
San Fransisco Branch
Borrowing Arrangements
Advances from FHLB	$ 0

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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