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Borrowing Arrangements (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Borrowing Arrangements    
Investments securing FHLB advances, amortized cost $ 478,313,000  
Available-for-sale debt securities 479,622,000 $ 463,905,000
Federal funds purchased 0 0
Federal Home Loan Bank Advances    
Borrowing Arrangements    
Loans Pledged as Collateral 443,162,000  
Remaining borrowing capacity 287,839,000  
Federal Home Loan Bank Advances | Securities Pledged as Collateral    
Borrowing Arrangements    
Investments securing FHLB advances, amortized cost 312,000 326,000
Available-for-sale debt securities 323,000 337,000
San Fransisco Branch    
Borrowing Arrangements    
Advances from FHLB $ 7,000,000 $ 10,000,000