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Stock Based Compensation Plans - Summary of Nonvested Phantom Stock Units (Details)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Nonvested Units, Beginning balance | shares 20,335
Nonvested Units, Granted | shares 13,210
Nonvested Units, Vested | shares (9,874)
Nonvested Units, Forfeited | shares
Nonvested Units, Canceled | shares
Nonvested Units, Ending Balance | shares 23,671
Phantom Stock Unit Awards Expected to Vest, Units | shares 23,671
Nonvested Weighted Average Grant Date Fair Value, Beginning balance | $ / shares $ 22.74
Nonvested Weighted Average Grant Date Fair Value, Granted | $ / shares 30.57
Nonvested Weighted Average Grant Date Fair Value, Vested | $ / shares 20.16
Nonvested Weighted Average Grant Date Fair Value, Forfeited | $ / shares
Nonvested Weighted Average Grant Date Fair Value, Canceled | $ / shares
Nonvested Weighted Average Grant Date Fair Value, Ending Balance | $ / shares 27.87
Phantom Stock Unit Awards Expected to Vest, Weighted Average Grant Date Fair Value | $ / shares $ 27.87