Other Income And Other Expense (Details) - USD ($)		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
All other income and commissions:
ATM interchange fees		$ 2,958,000	$ 2,761,000
Electronic banking fees		1,397,000	1,428,000
Mortgage banking		1,273,000	1,584,000
Letter of credit fees		1,061,000	1,123,000
Deferred compensation	[1]	329,000	1,033,000
Other		3,071,000	3,125,000
Total		10,089,000	11,054,000
All other expense:
Travel and entertainment		2,062,000	1,614,000
Customer relations		1,879,000	1,314,000
Employee training and dues		1,390,000	1,132,000
Supplies		1,026,000	927,000
Miscellaneous loan costs		717,000	361,000
Tax credit investments		706,000	395,000
Litigation and regulatory matters		(475,000)	162,500,000
Other		11,719,000	8,423,000
Total		$ 19,024,000	$ 176,666,000

[1] (a) Deferred compensation market value adjustments are mirrored by adjustments to employee compensation, incentives, and benefits expense.