Derivatives (Summary Of Types Of Derivatives, Separately By Assets And Liabilities And Fair Value Of Derivatives) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative assets	$ 32,256	$ 47,501
Interest Rate Lock Commitments
Derivatives, Fair Value [Line Items]
Derivative assets	4,752	4,076
Interest Rate Forward Sales Commitments
Derivatives, Fair Value [Line Items]
Derivative assets	286	8,054
Total liability derivatives	567	1,318
Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative assets	26,081	34,701
Total liability derivatives	7,229	34,871
Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Derivative assets	32,256	47,501
Total liability derivatives	9,288	37,063
Interest Rate Contracts | Interest Rate Lock Commitments | Asset Derivatives
Derivatives, Fair Value [Line Items]
Derivative assets	4,752	4,076
Interest Rate Contracts | Interest Rate Lock Commitments | Liability Derivatives
Derivatives, Fair Value [Line Items]
Total liability derivatives	0	0
Interest Rate Contracts | Interest Rate Forward Sales Commitments | Asset Derivatives
Derivatives, Fair Value [Line Items]
Derivative assets	286	8,054
Interest Rate Contracts | Interest Rate Forward Sales Commitments | Liability Derivatives
Derivatives, Fair Value [Line Items]
Total liability derivatives	567	1,318
Interest Rate Contracts | Interest Rate Swap | Asset Derivatives
Derivatives, Fair Value [Line Items]
Derivative assets	26,081	34,701
Interest Rate Contracts | Interest Rate Swap | Liability Derivatives
Derivatives, Fair Value [Line Items]
Total liability derivatives	7,229	34,871
Foreign Exchange Contract
Derivatives, Fair Value [Line Items]
Derivative assets	1,137	670
Total liability derivatives	1,492	874
Foreign Exchange Contract | Asset Derivatives
Derivatives, Fair Value [Line Items]
Derivative assets	1,137	670
Foreign Exchange Contract | Liability Derivatives
Derivatives, Fair Value [Line Items]
Total liability derivatives	$ 1,492	$ 874