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Fair Value Measurements Fair Value, Assets Measured on Recurring Basis, Valuation Techniques (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2017
Mar. 31, 2016
Fair Value, Inputs, Level 3        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Securities Available-for-Sale $ 403   $ 403  
Mortgage servicing rights 182   192  
Fair Value, Measurements, Recurring        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Securities Available-for-Sale 58,107   59,011  
Mortgage servicing rights 182   192  
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Securities Available-for-Sale 403 $ 192 403  
Mortgage servicing rights 182 190 192  
Fair Value, Measurements, Recurring | Mortgage Backed Securities, Other | Fair Value, Inputs, Level 3        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 45 $ 45 45 $ 45
Fair Value Measurements, Valuation Techniques Cost Cost    
Fair Value Measurements, Significant Assumptions n/a n/a    
Fair Value, Measurements, Recurring | Other investments | Fair Value, Inputs, Level 3        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 358 $ 192   148
Fair Value Measurements, Valuation Techniques Cost Cost    
Fair Value Measurements, Significant Assumptions Contribution into Fund Contribution into Fund    
Alternative Investment, Fair Value Disclosure $ 0 $ 0    
Fair Value, Measurements, Recurring | Other Assets | Fair Value, Inputs, Level 3        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 182 $ 190 $ 192 $ 201
Fair Value Measurements, Valuation Techniques Discounted Cash Flow Discounted Cash Flow    
Fair Value Measurements, Significant Assumptions [1] Weighted Average Constant Prepayment Rate(1) Weighted Average Constant Prepayment Rate(1)    
Fair Value Inputs, Prepayment Rate [1] 23.10% 22.25%    
[1] (1) Represents annualized loan repayment rate assumptions