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Loans - Narrative (Details)
9 Months Ended 12 Months Ended
Apr. 01, 2014
USD ($)
purchased_loan
Sep. 30, 2015
USD ($)
financing_commitment
Contract
Dec. 31, 2014
USD ($)
Contract
Business Acquisition [Line Items]      
Nonaccrual loans   $ 3,735,000 $ 4,674,000
Nonperforming loans minimum threshold for individual impairment evaluation   50,000  
Recorded investment in loans considered to be impaired   34,986,000 11,297,000
Fair value of purchased credit impaired loans $ 3,900,000 1,700,000  
Loans classified as troubled debt restructuring   $ 5,104,000 $ 7,700,000
Number of commitments on TDR | financing_commitment   0  
TDR Write-downs   $ 304,000  
TDR with specific allowance, Number of Contracts | Contract   0 0
TDR that Subsequently Defaulted, Number of Contracts | Contract   0 0
Alaska Pacific Bank      
Business Acquisition [Line Items]      
Purchased impaired loans | purchased_loan 18    
Accretable difference on purchased loans   $ 0  
Fair value of purchased credit impaired loans $ 3,899,000