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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Assets:    
Available for sale debt securities, fair value $ 212,650 $ 214,512
Mortgage servicing rights, fair value 2,688 2,584
Government sponsored enterprises    
Assets:    
Available for sale debt securities, fair value 0  
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Available for sale debt securities, fair value 0 0
Mortgage servicing rights, fair value 0 0
Assets, Total 0 0
Other Observable Inputs (Level 2)    
Assets:    
Available for sale debt securities, fair value 212,650 214,512
Mortgage servicing rights, fair value 0 0
Assets, Total 212,650 214,512
Significant Unobservable Inputs (Level 3)    
Assets:    
Available for sale debt securities, fair value 0 0
Mortgage servicing rights, fair value 2,688 2,584
Assets, Total 2,688 2,584
Recurring    
Assets:    
Assets, Total 215,338 217,096
Recurring | U.S. government and federal agency obligations    
Assets:    
Available for sale debt securities, fair value 12,473 13,364
Recurring | Government sponsored enterprises    
Assets:    
Available for sale debt securities, fair value 32,619 32,459
Recurring | Obligations of states and political subdivisions    
Assets:    
Available for sale debt securities, fair value 47,726 42,032
Recurring | Mortgage-backed securities    
Assets:    
Mortgage servicing rights, fair value 119,832 126,657
Recurring | Mortgage servicing rights    
Assets:    
Mortgage servicing rights, fair value 2,688 2,584
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government and federal agency obligations    
Assets:    
Available for sale debt securities, fair value 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Government sponsored enterprises    
Assets:    
Available for sale debt securities, fair value 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of states and political subdivisions    
Assets:    
Available for sale debt securities, fair value 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities    
Assets:    
Mortgage servicing rights, fair value 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage servicing rights    
Assets:    
Mortgage servicing rights, fair value 0 0
Recurring | Other Observable Inputs (Level 2)    
Assets:    
Assets, Total 212,650 214,512
Recurring | Other Observable Inputs (Level 2) | U.S. government and federal agency obligations    
Assets:    
Available for sale debt securities, fair value 12,473 13,364
Recurring | Other Observable Inputs (Level 2) | Government sponsored enterprises    
Assets:    
Available for sale debt securities, fair value 32,619 32,459
Recurring | Other Observable Inputs (Level 2) | Obligations of states and political subdivisions    
Assets:    
Available for sale debt securities, fair value 47,726 42,032
Recurring | Other Observable Inputs (Level 2) | Mortgage-backed securities    
Assets:    
Mortgage servicing rights, fair value 119,832 126,657
Recurring | Other Observable Inputs (Level 2) | Mortgage servicing rights    
Assets:    
Mortgage servicing rights, fair value 0 0
Recurring | Significant Unobservable Inputs (Level 3)    
Assets:    
Assets, Total 2,688 2,584
Recurring | Significant Unobservable Inputs (Level 3) | U.S. government and federal agency obligations    
Assets:    
Available for sale debt securities, fair value 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Government sponsored enterprises    
Assets:    
Available for sale debt securities, fair value 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Obligations of states and political subdivisions    
Assets:    
Available for sale debt securities, fair value 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage-backed securities    
Assets:    
Mortgage servicing rights, fair value 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage servicing rights    
Assets:    
Mortgage servicing rights, fair value $ 2,688 $ 2,584