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Borrowing Arrangements (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Borrowing Arrangements    
Investments securing FHLB advances, amortized cost $ 548,640,000 $ 470,080,000
Maximum borrowing capacity on lines of credit 40,000,000  
Federal funds purchased 400,000 0
Available-for-sale investment securities 547,749,000 477,554,000
Federal Home Loan Bank Advances    
Borrowing Arrangements    
Loans Pledged as Collateral 270,539,000  
Remaining borrowing capacity 173,992,000  
Federal Home Loan Bank Advances | Securities Pledged as Collateral    
Borrowing Arrangements    
Investments securing FHLB advances, amortized cost 584,000 750,000
Investments securing FLHB advances, market value 637,000 825,000
Federal Reserve Bank Advances    
Borrowing Arrangements    
Line of credit, current 9,102,000 2,328,000
Federal Reserve Bank Advances | Securities Pledged as Collateral    
Borrowing Arrangements    
Investments securing FHLB advances, amortized cost 2,407,000 2,578,000
Available-for-sale investment securities 2,436,000 $ 2,598,000
San Francisco Branch    
Borrowing Arrangements    
Advances from FHLB $ 0