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Borrowing Arrangements (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Borrowing Arrangements
Investments securing FHLB advances, amortized cost	$ 615,575,000
Available-for-sale debt securities	631,854,000	$ 470,746,000
Federal funds purchased	0	0
Federal Home Loan Bank Advances
Borrowing Arrangements
Loans Pledged as Collateral	431,925,000
Remaining borrowing capacity	241,964,000
Federal Home Loan Bank Advances | Securities Pledged as Collateral
Borrowing Arrangements
Investments securing FHLB advances, amortized cost	176,000	248,000
Available-for-sale debt securities	185,000	$ 256,000
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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