Stock-Based Compensation Plans (Schedule of Outstanding Restricted Stock) (Details) - Long-Term Restricted Stock	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Number of Units
Nonvested, beginning (in shares) | shares	129,251
Granted during the period (in shares) | shares	82,826
Vested during the period (in shares) | shares	(37,961)
Forfeited or expired during the period (in shares) | shares	(954)
Nonvested, ending (in shares) | shares	173,162
Weighted-Average Grant-Date Fair Value
Nonvested, beginning (in dollars per share) | $ / shares	$ 32.39
Granted during the period (in dollars per share) | $ / shares	36.36
Vested during the period (in dollars per share) | $ / shares	21.69
Forfeited or expired during the period (in dollars per share) | $ / shares	41.93
Nonvested, ending (in dollars per share) | $ / shares	$ 36.58