Parent Company Condensed Financial Information (Statements Of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income	$ 17,704	$ 17,407	$ 21,030
Net cash provided by operating activities	26,981	14,932	26,703
Payments to Acquire Available-for-sale Securities	159,542	115,710	51,344
Purchases of available for sale securities	(159,542)	(115,710)	(51,344)
Net cash used in investing activities	(131,535)	(194,433)	(231,795)
Net proceeds from issuance of common stock	1,239	682	385
Purchases of treasury stock	(22,721)	(8,624)	(10,302)
Common stock dividends paid	(6,088)	(4,607)	(3,131)
Net cash provided by financing activities	102,075	116,694	66,189
Net decrease in cash and cash equivalents	(2,479)	(62,807)	(138,903)
Beginning of period	78,129	140,936	279,839
End of period	75,650	78,129	140,936
Parent Company [Member]
Net income	17,704	17,407	21,030
Equity in undistributed (income) loss of subsidiaries	(10,166)	737	(3,851)
Other, net	6,823	2,295	2,937
Net cash provided by operating activities	14,361	20,439	20,116
Payments to Acquire Available-for-sale Securities			1,121
Purchases of available for sale securities			(1,121)
Sales/Maturities of available for sale securities		750	2,540
Proceeds from Sale and Maturity of Available-for-sale Securities		750	2,540
Outlays For Business Acquisitions		(4,697)
Other, net		(155)
Net cash used in investing activities		(4,102)	1,419
Net proceeds from issuance of common stock	1,239	682	1,386
Purchases of treasury stock	(22,721)	(8,624)	(10,302)
Common stock dividends paid	(6,088)	(4,607)	(3,132)
Other, net	(5,155)	5,155
Net cash provided by financing activities	(32,725)	(7,394)	(12,048)
Net decrease in cash and cash equivalents	(18,364)	8,943	9,487
Beginning of period	30,469	21,526	12,039
End of period	$ 12,105	$ 30,469	$ 21,526