Derivatives (Summary Of Types Of Derivatives, Separately By Assets And Liabilities And Fair Value Of Derivatives) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 18,718	$ 32,256
Liability derivatives	39,893	9,288
Interest Rate Lock Commitments
Derivatives, Fair Value [Line Items]
Asset derivatives	5,159	4,752
Interest Rate Forward Sales Commitments
Derivatives, Fair Value [Line Items]
Asset derivatives	1,950	286
Liability derivatives	77	567
Interest Rate Swap
Derivatives, Fair Value [Line Items]
Asset derivatives	10,890	26,081
Liability derivatives	39,303	7,229
Interest Rate Contracts | Interest Rate Lock Commitments | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	5,159	4,752
Interest Rate Contracts | Interest Rate Lock Commitments | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	0	0
Interest Rate Contracts | Interest Rate Forward Sales Commitments | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	1,950	286
Interest Rate Contracts | Interest Rate Forward Sales Commitments | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	77	567
Interest Rate Contracts | Interest Rate Swap | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	10,890	26,081
Interest Rate Contracts | Interest Rate Swap | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	39,303	7,229
Foreign Exchange Contract
Derivatives, Fair Value [Line Items]
Asset derivatives	719	1,137
Liability derivatives	513	1,492
Foreign Exchange Contract | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	719	1,137
Foreign Exchange Contract | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 513	$ 1,492