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Fair Value Measurements - Quantitative (Details) - Fair Value, Inputs, Level 3 - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Measurements, Recurring | FHLB Stock    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value of assets $ 3,174 $ 2,094
Fair Value, Measurements, Recurring | FHLB Stock | FHLB par stated value    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value of assets 3,174  
Fair Value, Measurements, Nonrecurring    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Impaired loans (collateral dependent), Fair Value 3,742 $ 3,481
Fair Value, Measurements, Nonrecurring | Impaired loans (collateral dependent) | Appraisal of collateral    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Impaired loans (collateral dependent), Fair Value [1] $ 3,742  
Fair Value, Measurements, Nonrecurring | Impaired loans (collateral dependent) | Appraisal of collateral | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Unobservable Input Value or Range 5.00%  
Fair Value, Measurements, Nonrecurring | Impaired loans (collateral dependent) | Appraisal of collateral | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Unobservable Input Value or Range 50.00%  
[1] Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses.