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Stock-Based Compensation Plans (Details 2) - Restricted Stock [Member]
 3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares of Restricted Stock, Non-vested beginning of year | shares 66,050
Shares of Restricted Stock, Issued | shares 0
Shares of Restricted Stock, Vested | shares 0
Shares of Restricted Stock, Forfeited | shares (1,675)
Shares of Restricted Stock, Non-vested end of year | shares 64,375
Weighted Average Grant Date Fair Value, Non-vested beginning of year (in dollars per share) | $ / shares $ 26.79
Weighted Average Grant Date Fair Value, Issued (in dollars per share) | $ / shares 0
Weighted Average Grant Date Fair Value, Vested (in dollars per share) | $ / shares 0
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share) | $ / shares 26.59
Weighted Average Grant Date Fair Value, Non-vested end of year (in dollars per share) | $ / shares $ 26.8
Weighted Average Remaining Contractual Term (Years), Non-vested at March 30, 2018 2 years 7 months 6 days
Aggregate Intrinsic Value (in dollars), Non-vested at March 30, 2018 | $ $ 2,163,000 [1]
[1] The aggregate intrinsic value of non-vested restricted stock was calculated using the market value of the Company's stock on March 29, 2018, the last trading day of the quarter, of $33.60 multiplied by the number of non-vested restricted shares outstanding.