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Stock-Based Compensation Plans (Details 2) - Restricted Stock [Member]
 9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares of Restricted Stock, Non-vested beginning of year | shares 58,500
Shares of Restricted Stock, Issued | shares 30,800
Shares of Restricted Stock, Vested | shares (18,600)
Shares of Restricted Stock, Forfeited | shares 0
Shares of Restricted Stock, Non-vested end of year | shares 70,700
Weighted Average Grant Date Fair Value, Non-vested beginning of year (in dollars per share) | $ / shares $ 26.09
Weighted Average Grant Date Fair Value, Issued (in dollars per share) | $ / shares 27.94
Weighted Average Grant Date Fair Value, Vested (in dollars per share) | $ / shares 26.05
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share) | $ / shares 0
Weighted Average Grant Date Fair Value, Non-vested end of year (in dollars per share) | $ / shares $ 26.9
Weighted Average Remaining Contractual Term (Years), Non-vested at September 30, 2017 2 years 10 months 24 days
Aggregate Intrinsic Value (in dollars), Non-vested at September 30, 2017 | $ $ 2,006,000 [1]
[1] The aggregate intrinsic value of non-vested restricted stock was calculated using the market value of the Company's stock on September 29, 2017, the last trading day of the quarter, of $28.38 multiplied by the number of non-vested restricted shares outstanding.