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Fair Value Measurements - Quantitative information about Level III fair value measurements (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Percentage at which new appraisals are discounted 10.00%  
Impaired Loans [Member] | Discounted appraised value [Member] | Minimum [Member] | Level III [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount rate 0.00% 0.00%
Impaired Loans [Member] | Discounted appraised value [Member] | Maximum [Member] | Level III [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount rate 100.00% 100.00%
Impaired Loans [Member] | Discounted appraised value [Member] | Weighted Average [Member] | Level III [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount rate 14.00% 17.00%
Impaired Loans [Member] | Present Value of Cash Flows [Member] | Minimum [Member] | Level III [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount rate 6.00% 6.00%
Impaired Loans [Member] | Present Value of Cash Flows [Member] | Maximum [Member] | Level III [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount rate 8.00% 8.00%
Impaired Loans [Member] | Present Value of Cash Flows [Member] | Weighted Average [Member] | Level III [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount rate 7.00% 7.00%
Other Real Estate Owned [Member] | Discounted appraised value [Member] | Level III [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount rate 10.00%  
Other Real Estate Owned [Member] | Discounted appraised value [Member] | Weighted Average [Member] | Level III [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount rate   10.00%
Repossessed Assets [Member] | Market Approach Valuation Technique [Member] | Weighted Average [Member] | Level III [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount rate 50.00% 50.00%
Nonrecurring [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Impaired loans $ 8,736 $ 9,018
Other real estate owned 3,727 3,345
Repossessed assets 1,043 1,043
Nonrecurring [Member] | Level III [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Impaired loans 8,736 9,018
Other real estate owned 3,727 3,345
Repossessed assets 1,043 1,043
Nonrecurring [Member] | Discounted appraised value [Member] | Level III [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Impaired loans 5,321 5,434
Other real estate owned 3,727 3,345
Nonrecurring [Member] | Present Value of Cash Flows [Member] | Level III [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Impaired loans $ 3,415 $ 3,584