Property Held For Sale (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Activity of Property Held for Sale [Roll Forward]
Beginning balance	$ 25,567	$ 37,529	$ 53,392
Acquisitions	2,356	2,617	2,673
Real Estate Acquired Through Foreclosure Acquired through Merger Acquisition	23	0	0
Capitalized improvements	463	39	87
Dispositions	(3,237)	(12,203)	(14,852)
Valuation adjustments	(668)	(2,415)	(3,771)
Balance at year end	$ 24,504	$ 25,567	$ 37,529