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Borrowing Arrangements (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Borrowing Arrangements    
Investments securing FHLB advances, amortized cost $ 1,045,753,000  
Available-for-sale debt securities 1,060,362,000 $ 710,092,000
Federal funds purchased 0 0
Federal Home Loan Bank Advances    
Borrowing Arrangements    
Loans Pledged as Collateral 462,491,000  
Remaining borrowing capacity 262,091,000  
Federal Home Loan Bank Advances | Securities Pledged as Collateral    
Borrowing Arrangements    
Investments securing FHLB advances, amortized cost 121,000 169,000
Available-for-sale debt securities 127,000 $ 178,000
San Fransisco Branch    
Borrowing Arrangements    
Advances from FHLB $ 0