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Loans & Leases and Allowance for Credit Losses, Loans by Class Modified as Troubled Debt Restructured Loans (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Loan
Sep. 30, 2015
USD ($)
Loan
Sep. 30, 2016
USD ($)
Loan
Sep. 30, 2015
USD ($)
Loan
Dec. 31, 2015
USD ($)
Loan
Financing Receivable, Modifications [Line Items]          
Specific reserves $ 758,000 $ 1,100,000 $ 758,000 $ 1,100,000 $ 1,100,000
Troubled debt restructured loans 6,100,000 6,600,000 6,100,000 6,600,000 6,600,000
Commitments to lend additional amounts to customers with outstanding loans that are classified as troubled debt restructurings $ 0 $ 0 $ 0 $ 0 $ 0
Loans by class modified as troubled debt restructured loans [Abstract]          
Number of Loans | Loan 1 1 4 2 2
Pre-Modification Outstanding Recorded Investment $ 192,000 $ 194,000 $ 594,000 $ 325,000 $ 325,000
Post-Modification Outstanding Recorded Investment 192,000 194,000 567,000 313,000 313,000
Increase (decrease) in allowance for loan losses due to TDR 0 0 0 70,000 70,000
TDR's charge-offs $ 0 $ 0 $ 27,000 $ 12,000 $ 12,000
Number of loans modified as troubled debt restructurings with subsequent payment defaults | Loan 0 0 0 0 0
Threshold period after which loan is considered to be in payment default     90 days 90 days  
Stated Interest Rate Reduction [Member]          
Financing Receivable, Modifications [Line Items]          
Period of modifications     5 years    
Stated Interest Rate Reduction [Member] | Minimum [Member]          
Financing Receivable, Modifications [Line Items]          
Period of modifications       5 years 4 years
Stated Interest Rate Reduction [Member] | Maximum [Member]          
Financing Receivable, Modifications [Line Items]          
Period of modifications       10 years 30 years
Extended Maturity [Member]          
Financing Receivable, Modifications [Line Items]          
Period of modifications     10 years    
Extended Maturity [Member] | Minimum [Member]          
Financing Receivable, Modifications [Line Items]          
Period of modifications       5 years 6 months
Extended Maturity [Member] | Maximum [Member]          
Financing Receivable, Modifications [Line Items]          
Period of modifications       10 years 30 years
Performing [Member]          
Financing Receivable, Modifications [Line Items]          
Troubled debt restructured loans $ 4,600,000 $ 5,000,000 $ 4,600,000 $ 5,000,000 $ 5,000,000
Residential 1st Mortgages [Member]          
Loans by class modified as troubled debt restructured loans [Abstract]          
Number of Loans | Loan 1   2    
Pre-Modification Outstanding Recorded Investment $ 192,000   $ 289,000    
Post-Modification Outstanding Recorded Investment $ 192,000   $ 281,000    
Home Equity Lines & Loans [Member]          
Loans by class modified as troubled debt restructured loans [Abstract]          
Number of Loans | Loan 0   2    
Pre-Modification Outstanding Recorded Investment $ 0   $ 305,000    
Post-Modification Outstanding Recorded Investment $ 0   $ 286,000    
Agricultural [Member]          
Loans by class modified as troubled debt restructured loans [Abstract]          
Number of Loans | Loan   1   1 1
Pre-Modification Outstanding Recorded Investment   $ 194,000   $ 194,000 $ 194,000
Post-Modification Outstanding Recorded Investment   $ 194,000   $ 194,000 $ 194,000
Commercial [Member]          
Loans by class modified as troubled debt restructured loans [Abstract]          
Number of Loans | Loan   0   1 1
Pre-Modification Outstanding Recorded Investment   $ 0   $ 131,000 $ 131,000
Post-Modification Outstanding Recorded Investment   $ 0   $ 119,000 $ 119,000