Parent Company Condensed Financial Information (Statements Of Financial Condition) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash and cash equivalents	$ 75,650	$ 78,129	$ 140,936	$ 279,839
Available-for-sale Securities	426,218	400,331
Other assets	34,998	32,031
Total assets	2,475,392	2,357,022	1,214
Subordinated debentures	46,393	51,548
Other liabilities	10,171	11,684
Common stock and related accounts	21,231	21,138
Total liabilities & shareholders' equity	2,475,392	2,357,022
Parent Company [Member]
Cash and cash equivalents	12,105	30,469	$ 21,526	$ 12,039
Investment in subsidiary banks	315,181	305,064
Investments in other subsidiaries	2,084	8,444
Other assets	5,499	6,393
Total assets	334,869	350,370
Subordinated debentures	46,393	51,548
Other liabilities	1,847	2,724
Common stock and related accounts	286,629	296,098
Total liabilities & shareholders' equity	$ 334,869	$ 350,370