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Fair Value Measurements (Details 1) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Changes in Level 3 Investment Securities, Available for Sale Measured at Fair Value on a Recurring Basis    
Total unrealized gains (losses) included in other comprehensive income $ 196  
Fair Value Measured on a Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Changes in Level 3 Investment Securities, Available for Sale Measured at Fair Value on a Recurring Basis    
Balance at the beginning of year 15,103 $ 11,799
Total realized and unrealized gains included in income  
Total unrealized gains (losses) included in other comprehensive income 111 31
Net purchases, sales, calls, and maturities (6) (18)
Net transfers into Level 3  
Balance at the end of year $ 15,208 $ 11,812