Fair Value Accounting (Changes In Fair Value Included In Consolidated Statements Of Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Mortgage loans held for sale	$ (667)	$ (742)	$ 1,399
Fair value	51,545	59,275	63,328
Unpaid principal balance	51,114	58,177	61,488
Fair value less aggregate unpaid principal balance	$ 431	$ 1,098	$ 1,840