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Stock-Based Compensation Plans (Details 2) - Restricted Stock [Member]
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares of Restricted Stock, Non-vested beginning of year | shares 61,480
Shares of Restricted Stock, Issued | shares 600
Shares of Restricted Stock, Vested | shares 0
Shares of Restricted Stock, Forfeited | shares 0
Shares of Restricted Stock, Non-vested end of year | shares 62,080
Weighted Average Grant Date Fair Value, Non-vested beginning of year (in dollars per share) | $ / shares $ 30.74
Weighted Average Grant Date Fair Value, Issued (in dollars per share) | $ / shares 28.77
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 $ 30.72
Weighted Average Remaining Contractual Term (Years) 2 years 4 months 24 days
Aggregate Intrinsic Value | $ $ 1,922,000 [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, 2019, the last trading day of the quarter, of $30.96 multiplied by the number of non-vested restricted shares outstanding.