Stock and Incentive Compensation - Compensation Expense for Awards and Units Under Stock Plan (Details) - Stock and Incentive Compensation Plan [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Compensation expense [Abstract]
Recognized compensation expense	$ 1,274	$ 1,279	$ 2,668	$ 2,281
Performance Awards and Units [Member]
Compensation expense [Abstract]
Recognized compensation expense	456	481	(57)	562
Time-Vested Awards and Units [Member]
Compensation expense [Abstract]
Recognized compensation expense	$ 818	$ 798	$ 2,725	$ 1,719