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Stock-Based Compensation Plans (Details 2)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted Average Remaining Contractual Term (Years), Non-vested at March 31, 2017 2 years 6 months
Aggregate Intrinsic Value (in dollars), Non-vested at March 31, 2017 | $ $ 1,643,000 [1]
Restricted Stock [Member]  
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 0
Shares of Restricted Stock, Vested | shares 0
Shares of Restricted Stock, Forfeited | shares 0
Shares of Restricted Stock, Non-vested end of year | shares 58,500
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 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 0
Weighted Average Grant Date Fair Value, Non-vested end of year (in dollars per share) | $ / shares $ 26.09
[1] The aggregate intrinsic value of non-vested restricted stock was calculated using the market value of the Company's stock on March 31, 2017 of $28.08 multiplied by the number of non-vested restricted shares outstanding.