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Loans and Leases - Troubled Debt Restructuring (Details)
9 Months Ended
Sep. 30, 2016
USD ($)
loan
item
Dec. 31, 2015
USD ($)
loan
Dec. 31, 2014
USD ($)
Financing Receivable, Modifications [Line Items]      
Number of loans | loan 5,000 6  
Total TDRs $ 2,113,000 $ 2,576,000  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | item 0    
Foreclosed residential real estate property $ 7,236,000 7,435,000 $ 9,779,000
Mortgage Loans in Process of Foreclosure, Amount 317,000    
Accrual Status [Member]      
Financing Receivable, Modifications [Line Items]      
Total TDRs 1,792,000 2,339,000  
Non Accrual Status [Member]      
Financing Receivable, Modifications [Line Items]      
Total TDRs $ 321,000 $ 237,000  
Commercial real estate [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans | loan 1,000 1  
Total TDRs $ 20,000 $ 24,000  
Commercial real estate [Member] | Accrual Status [Member]      
Financing Receivable, Modifications [Line Items]      
Total TDRs $ 20,000 $ 24,000  
Construction and land development [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans | loan 1,000 1  
Total TDRs $ 144,000 $ 145,000  
Construction and land development [Member] | Non Accrual Status [Member]      
Financing Receivable, Modifications [Line Items]      
Total TDRs $ 144,000 $ 145,000  
Commercial and industrial [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans | loan 2,000 3  
Total TDRs $ 1,865,000 $ 2,315,000  
Commercial and industrial [Member] | Accrual Status [Member]      
Financing Receivable, Modifications [Line Items]      
Total TDRs 1,688,000 $ 2,315,000  
Commercial and industrial [Member] | Non Accrual Status [Member]      
Financing Receivable, Modifications [Line Items]      
Total TDRs $ 177,000    
Residential real estate [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans | loan 1,000 1  
Total TDRs $ 84,000 $ 92,000  
Residential real estate [Member] | Accrual Status [Member]      
Financing Receivable, Modifications [Line Items]      
Total TDRs 84,000    
Residential real estate [Member] | Non Accrual Status [Member]      
Financing Receivable, Modifications [Line Items]      
Total TDRs   92,000  
Loans [Member]      
Financing Receivable, Modifications [Line Items]      
Foreclosed residential real estate property 243,000 $ 220,000 $ 349,000
Loans, Residential Real Estate [Member]      
Financing Receivable, Modifications [Line Items]      
Foreclosed residential real estate property $ 28,000